2017-18 - Wyoming Water Year Climate Summary

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Previous Annual and Water Year Climate Summaries

Wyoming: Water Year 2017-18 (October 1 - September 30)

Precipitation - Percent of Normal

Temperature - Departure from Normal

Wyoming: Water Year 2017-18 Percent of Normal Precipitation (Click to Enlarge)

Wyoming: Water Year 2017-18 Departure from Normal Temperature

Climate Division: Wyoming (Statewide Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	41.1	34.7	23.8	25.2	19.2	32.4	39.7	52.9	60.2	67.3	63.5	57.3	43.1
20th Century Average	42.5	29.0	20.6	18.4	22.3	29.1	38.8	48.4	57.6	65.3	63.4	53.6	40.8
Departure from Average	-1.4	5.7	3.2	6.8	-3.1	3.3	0.9	4.5	2.6	2.0	0.1	3.7	2.4
Rank: Warm to Cold (124 yrs)	89	8	28	8	98	32	52	7	28	27	65	12	12
Rank: Cold to Warm (124 yrs)	35	116	96	117	27	93	73	118	97	98	60	113	112

Precipitation	0.78	1.48	1.01	0.90	1.23	1.35	1.46	3.03	2.10	1.21	0.95	0.45	15.95
20th Century Average	1.20	1.03	1.01	1.06	0.97	1.25	1.77	2.21	1.84	1.28	1.07	1.24	15.93
Percent of Average	65	144	100	85	127	108	82	134	114	95	89	36	100
Rank: Dry to Wet (124 yrs)	33	106	66	47	102	78	48	22	84	73	60	12	60
Rank: Wet to Dry (124 yrs)	92	19	59	78	23	47	77	103	41	52	65	113	64

Maps and Statewide Averages for 3, 12 and 60 Months

Wyoming Climate Divisions: Water Year 2017-18 (Oct - Sep)

Wyoming Climate Divisions Map - Click to Enlarge

Climate Division 1 - Yellowstone Drainage

Climate Division: Yellowstone (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	36.2	28.1	19.7	22.7	16.4	27.2	34.7	47.5	51.4	60.3	56.8	50.2	37.6
20th Century Average	37.3	24.6	16.9	15.2	18.9	24.3	33.3	42.4	50.3	57.9	56.2	47.4	35.4
Departure from Avegage	-1.1	3.5	2.8	7.5	-2.5	2.9	1.4	5.1	1.1	2.4	0.6	2.8	2.2
Rank: Warm to Cold (124 yrs)	85	24	32	6	95	37	45	6	42	18	55	24	11
Rank: Cold to Warm (124 yrs)	39	100	94	119	30	88	80	119	83	107	70	101	113

Precipitation	1.37	5.51	2.86	2.92	3.91	2.52	4.06	3.14	4.00	0.53	1.72	0.48	33.02
20th Century Average	1.88	2.49	2.63	2.89	2.26	2.61	2.47	2.84	2.57	1.61	1.51	1.80	27.56
Percent of Average	73	221	109	101	173	97	164	111	156	33	114	27	120
Rank: Dry to Wet (124 yrs)	40	119	73	71	117	59	119	82	110	8	87	11	111
Rank: Wet to Dry (124 yrs)	84	5	51	54	8	66	6	43	15	117	38	114	13

Station Name:

Oct
2017

Nov
2017

Dec
2017

Jan
2018

Feb
2018

Mar
2018

Apr
2018

May
2018

Jun
2018

Jul
2018

Aug
2018

Sep
2018

Total for
WY 2017-18

click on location

for graph

Old Faithful

None

1.62

5.47

2.10

2.44

3.53

2.58

2.54

1.93

3.99

0.58

1.39

0.19

28.36

1981-2010 Normals

1.66

2.29

3.16

2.11

1.99

2.21

2.80

2.47

1.55

1.46

25.37

Percent of Normal

239

116

177

117

115

162

112

Snowfall

8.5

45.5

43.5

40.5

57.5

27.5

12.0

0.0

235.0

1981-2010 Normals

7.7

31.7

43.8

37.5

31.1

26.8

19.3

7.3

1.2

0.0

1.4

207.8

Percent of Normal

110

144

108

185

103

113

Climate Division 2 - Snake Drainage

Climate Division: Snake (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	35.3	27.9	19.7	22.0	18.7	25.4	34.7	46.2	51.2	59.8	56.4	50.3	37.3
20th Century Average	37.4	24.3	16.0	14.7	18.3	23.6	33.0	42.3	50.0	57.7	56.0	47.5	35.1
Departure from Avegage	-2.1	3.5	3.7	7.3	0.4	1.8	1.7	3.9	1.2	2.1	0.4	2.8	2.2
Rank: Warm to Cold (124 yrs)	94	24	21	3	59	47	40	8	41	20	56	17	7
Rank: Cold to Warm (124 yrs)	30	100	103	122	66	78	85	117	84	105	69	108	117

Precipitation	1.63	6.35	2.48	3.73	3.71	4.27	4.74	3.89	2.76	0.50	1.40	0.16	35.62
20th Century Average	2.12	3.33	3.72	4.34	3.59	3.45	2.81	2.91	2.31	1.32	1.46	1.77	33.13
Percent of Average	77	191	67	86	103	123	169	134	119	38	96	9	108
Rank: Dry to Wet (124 yrs)	46	115	31	55	79	33	121	103	88	13	70	1	81
Rank: Wet to Dry (124 yrs)	78	9	93	70	46	92	4	22	37	112	55	124	43

Station Name:

Oct
2017

Nov
2017

Dec
2017

Jan
2018

Feb
2018

Mar
2018

Apr
2018

May
2018

Jun
2018

Jul
2018

Aug
2018

Sep
2018

Total for
WY 2017-18

click on location

for graph

Afton

0.64

2.83

1.42

1.29

2.29

2.61

1.57

0.68

0.61

0.01

17.67

1981-2010 Normals

1.63

1.48

1.25

1.40

1.09

1.40

1.54

2.26

1.97

1.43

1.25

1.46

18.16

Percent of Normal

191

114

101

118

164

149

115

Snowfall

2.4

5.7

19.6

16.2

11.8

23.1

7.2

0.0

86.0

Moose

1.00

3.85

1.34

1.62

2.15

2.89

3.03

2.74

2.66

0.55

1.40

0.01

23.24

1981-2010 Normals

1.47

2.64

2.67

2.58

1.82

1.62

1.49

1.88

1.61

1.29

1.44

21.80

Percent of Normal

146

117

178

203

146

165

109

107

Snowfall

4.1

13.6

15.9

23.4

19.4

22.1

14.2

0.0

112.7

1981-2010 Normals

4.8

24.1

44.7

36.9

26.6

15.9

7.4

2.2

0.0

0.2

162.8

Percent of Normal

139

192

JHMR MId Mtn

Snowfall

22.0

70.0

52.0

65.0

63.0

66.0

63.0

7.0

0.0

408.0

1975-2018 Average

17.0

34.0

76.0

82.0

65.0

56.0

21.0

13.0

2.0

0.0

1.0

367.0

Percent of Normal

129

206

118

300

111

Climate Division 3 - Green and Bear Drainages

Climate Division: Green and Bear (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	39.0	33.5	24.8	24.8	21.2	30.9	39.4	50.8	58.6	66.2	62.0	55.9	43.3
20th Century Average	40.7	27.0	18.3	16.2	19.7	27.0	37.0	46.6	55.3	62.8	60.8	51.6	38.6
Departure from Avegage	-1.7	6.5	6.5	8.6	1.5	3.9	2.4	4.2	3.3	3.4	1.2	4.3	3.7
Rank: Warm to Cold (124 yrs)	94	4	9	5	55	27	34	9	19	10	37	5	4
Rank: Cold to Warm (124 yrs)	30	120	115	120	70	98	91	116	106	115	88	120	120

Precipitation	0.35	1.37	0.86	0.78	1.02	1.10	1.02	2.03	0.94	0.44	0.66	0.11	10.68
20th Century Average	1.16	1.03	1.03	1.15	1.06	1.17	1.37	1.55	1.14	0.94	1.00	1.10	13.70
Percent of Average	30	133	83	68	96	94	74	131	82	47	66	10	78
Rank: Dry to Wet (124 yrs)	13	93	49	41	71	66	39	98	66	16	42	2	20
Rank: Wet to Dry (124 yrs)	111	31	75	84	54	59	86	27	59	109	83	123	104

Station Name:					Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
click on location			D0	D1
for graph	D2	D3		D4
Big Piney Airport	None				0.01	0.25	0.07	0.05	T	0.27	0.37	1.84	1.66	0.22	0.49	T	5.23
1981-2010 Normals					0.53	0.21	0.30	0.31	0.35	0.44	0.53	0.84	0.79	0.71	0.69	0.78	6.48
Percent of Normal					2	119	23	16	0	61	70	219	210	31	71	0	81

Evanston Airport	D1				T	1.47	0.07	0.17	0.41	0.06	T	0.33	1.04	0.52	0.83	0.02	4.92
1981-2010 Normals					1.17	1.04	0.58	0.54	0.61	0.86	1.15	1.77	1.24	0.90	0.96	1.31	12.13
Percent of Normal					0	141	12	31	67	7	0	19	84	58	86	2	41

Rock Springs Arpt.	D0				0.02	0.29	0.11	0.08	0.11	0.34	0.16	1.59	0.16	0.16	0.25	T	3.27
1981-2010 Normals					0.87	0.49	0.50	0.45	0.48	0.68	0.91	1.21	0.79	0.64	0.62	0.92	8.56
Percent of Normal					2	59	22	18	23	50	18	131	20	25	40	0	38

Bitter Creek 4NE	D0				0.04	0.50	0.32	0.10	0.26	0.43	0.50	1.98	0.18	0.13	0.47	0.04	4.95
1981-2010 Normals					0.66	0.31	0.51	0.28	0.36	0.30	0.65	1.09	0.70	0.60	0.75	0.73	6.94
Percent of Normal					6	161	63	36	72	143	77	182	26	22	63	5	71

Fossil Butte N.M.	D0				0.50	1.89	0.86	0.60	0.88	0.92	1.48	1.66	0.56	0.48	0.11	T	9.94
1981-2010 Normals					1.11	0.86	0.74	0.49	0.68	0.82	0.98	1.41	1.03	0.85	0.93	1.10	11.00
Percent of Normal					45	220	116	122	129	112	151	118	54	56	12	0	90
Snowfall					1.7	8.5	12.5	7.3	11.9	7.0	4.6	T	0.0	0.0	0.0	0.0	53.5

Green River	D0				0.07	0,80	0.60	0.68	0.53	1.12	1.15	2.54	0.45	0.25	0.36	0.00	8.55
1981-2010 Normals					0.81	0.41	0.44	0.34	0.43	0.71	0.85	1.23	0.98	0.55	0.68	0.90	8.33
Percent of Normal					9	195	136	200	123	158	135	207	46	45	53	0	103
Snowfall					T	4.5	6.3	6.8	6.9	6.7	0.8	0.0	0.0	0.0	0.0	0.0	32.0
1981-2010 Normals					0.5	3.8	6.5	64.6	7.3	5.0	3.9	0.6	0.0	0.0	0.0	0.0	32.2
Percent of Normal					0	118	97	148	95	134	21	0	0	0	0	0	99

Rock Springs	D0				0.10	0.65	0.49	0.37	0.55	0.12	0.50	2.71	0.19	T	0.37	0.00	6.05
1981-2010 Normals					1.09	0.52	0.52	0.44	0.46	0.67	0.91	1.42	0.86	0.73	0.96	1.08	9.66
Percent of Normal					9	125	94	84	120	18	55	191	22	0	39	0	63
Snowfall					T	1.1	6.9	5.5	7.3	0.0	T	0.0	0.0	0.0	0.0	0.0	20.8

Climate Division 4 - Big Horn Drainage

Climate Division: Big Horn (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	41.4	33.3	22.9	24.9	16.6	33.2	40.1	53.6	60.2	68.0	63,9	56.7	42.9
20th Century Average	42.6	29.2	20.6	17.7	22.7	30.2	39.8	49.1	58.1	65.8	63.7	53.5	41.1
Departure from Avegage	--1.2	4.1	2.3	7.2	-6.1	3.0	0.3	4.5	2.1	2.2	0.2	3.2	1.8
Rank: Warm to Cold (124 yrs)	83	22	46	12	109	33	63	6	34	29	66	23	20
Rank: Cold to Warm (124 yrs)	41	102	78	113	16	92	62	119	91	96	59	102	104

Precipitation	0.79	1.46	1.16	0.63	1.42	1.02	1.75	3.49	2.18	0.62	1.03	0.43	15.98
20th Century Average	1.14	0.95	0.87	0.92	0.75	1.12	1.75	2.22	1.92	1.13	0.94	1.31	15.02
Percent of Average	69	154	133	68	189	91	100	157	114	55	110	33	106
Rank: Dry to Wet (124 yrs)	41	105	92	37	117	59	74	110	86	30	88	21	80
Rank: Wet to Dry (124 yrs)	83	19	32	88	8	66	51	15	39	95	37	104	44

Station Name:					Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
click on location			D0	D1
for graph	D2	D3		D4
Greybull Airport	None				T	0.21	0.22	0.01	0.26	0.33	0.87	1.94	1.20	0.16	0.74	0.25	6.19
1981-2010 Normals					0.30	0.28	0.60	0.23	0.18	0.40	0.71	1.65	1.20	0.66	0.42	0.88	7.51
Percent of Normal					0	70	79	4	144	83	151	118	100	24	176	28	82

Worland Airport	None				0.23	0.68	0.44	0.15	0.17	0.66	1.30	2.00	0.81	0.23	0.54	0.05	7.26
1981-2010 Normals					0.69	0.35	0.23	0.23	0.19	0.46	0.86	1.42	1.15	0.71	0.43	0.85	7.57
Percent of Normal					33	194	191	65	89	143	151	141	70	32	126	6	96

Cody	None				0.59	1.04	0.84	0.37	0.51	0.27	1.35	4.06	2.21	0.58	1.35	0.26	13.43
1981-2010 Normals					0.89	0.48	0.33	0.33	0.33	0.56	1.06	1.82	1.68	1.11	0.91	1.06	10.56
Percent of Normal					66	217	255	112	155	48	127	223	132	52	148	25	127
Snowfall					1.0	6.6	9.0	2.0	8.0	1.3	6.6	0.0	0.0	0.0	0.0	0.0	34.5
1981-2010 Normals					4.3	6.3	8.0	7.8	6.7	6.9	6.3	0.8	0.0	0.0	0.0	0.2	47.3
Percent of Normal					23	105	113	26	119	19	105	0	0	0	0	0	73

Powell Field Station	None				0.01	0.25	0.19	0.08	0.31	0.10	0.74	2.13	1.97	0.11	0.95	0.16	7.00
1981-2010 Normals					0.56	0.18	0.13	0.21	0.13	0.29	0.51	1.40	1.35	0.87	0.52	0.65	6.80
Percent of Normal					2	139	146	38	238	34	145	152	146	13	183	25	103
Snowfall					0.0	0.8	2.0	3.0	5.5	T	3.2	0.0	0.0	0.0	0.0	0.0	14.5
1981-2010 Normals					1.2	1.3	1.2	2.3	0.5	2.5	0.5	0.5	0.0	0.0	0.0	0.1	10.1
Percent of Normal					0	62	167	130	1100	0	640	0	0	0	0	0	144

Thermopolis	None				0.70	0.65	0.70	0.39	0.27	0.64	1.16	3.19	2.11	0.50	0.42	0.06	10.79
1981-2010 Normals					1.26	0.80	0.46	0.35	0.45	0.87	1.46	1.86	1.51	0.88	0.58	1.23	11.71
Percent of Normal					56	81	152	111	60	74	79	172	140	57	72	5	92
Snowfall					0.0	8.0	11.6	4.5	6.0	1.0	0.0	0.0	0.0	0.0	0.0	0.0	31.1
1981-2010 Normals					2.4	3.7	4.5	5.6	4.6	2.5	2.8	0.4	0.0	0.0	0.0	0.2	26.7
Percent of Normal					0	216	258	80	130	40	0	0	0	0	0	0	116

Climate Division 5 - Powder and Tongue Drainages

Climate Division: Powder and Tongue (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	43.3	35.2	23.3	25.6	16.0	33.1	40.5	55.5	62.2	69.8	65.9	58.1	44.0
20th Century Average	44.6	31.0	22.3	19.6	23.8	31.1	41.2	50.8	60.2	68.2	66.5	55.9	42.9
Departure from Avegage	-1.3	4.2	1.0	6.0	-7.8	2.0	-0.7	4.7	2.0	1.6	-0.6	2.2	1.1
Rank: Warm to Cold (124 yrs)	83	27	69	24	111	43	72	9	36	40	76	33	37
Rank: Cold to Warm (124 yrs)	41	97	55	101	14	82	55	116	89	85	49	92	87

Precipitation	0.79	0.84	0.72	0.56	1.07	1.39	1.21	2.82	2.70	1.54	1.09	0.80	15.53
20th Century Average	1.16	0.77	0.65	0.63	0.61	1.05	1.85	2.54	2.35	1.40	0.99	1.28	15.28
Percent of Average	68	109	111	89	175	132	65	111	115	110	110	63	102
Rank: Dry to Wet (124 yrs)	41	81	83	61	116	93	35	78	86	84	81	46	65
Rank: Wet to Dry (124 yrs)	84	43	41	64	9	32	90	47	39	41	44	79	59

Station Name:					Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
click on location			D0	D1
for graph	D2	D3		D4
Buffalo Airport	None				0.27	0.61	0.32	0.12	0.22	0.93	0.73	3.04	1.66	1.80	0.94	0.97	11.61
1981-2010 Normals					0.93	0.54	0.40	0.42	0.35	0.92	1.30	2.53	2.28	1.66	0.81	1.31	13.45
Percent of Normal					29	113	80	29	63	101	56	120	73	108	116	74	86

Sheridan Arpt	None				0.34	1.54	1.11	0.63	1.53	1.50	1.83	3.57	1.43	1.21	1.30	1.21	17.20
1981-2010 Normals					1.41	0.71	0.56	0.56	0.54	0.98	1.60	2.35	2.12	1.18	0.72	1.43	14.16
Percent of Normal					24	217	198	113	283	153	114	152	67	103	181	85	121

Kaycee	None				1.34	0.76	0.38	0.34	0.64	0.72	0.42	2.05	2.78	0.38	1.26	0.32	11.39
1981-2010 Normals					1,04	0.57	0.31	0.30	0.34	0.74	1.46	2.37	1.84	1.42	0.80	1.18	12.37
Percent of Normal					129	133	123	113	188	97	29	86	151	27	158	27	92
Snowfall					1.0	7.5	9.3	5.5	14.0	5.0	4.0	0.0	0.0	0.0	0.0	1.0	47.3
1981-2010 Normals					1.5	4.2	6.0	5.9	6.3	8.0	4.7	0.6	0.1	0.0	0.0	0.2	37.5
Percent of Normal					67	179	155	93	222	63	85	0	0	0	0	500	126

Climate Division 6 - Belle Fourche Drainage

Climate Division: Belle Fourche (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	44.0	35.2	21.8	23.4	13.5	32.0	39.2	56.9	63.1	69.4	66.0	58.4	43.6
20th Century Average	45.0	31.0	22.1	19.0	23.1	30.6	41.4	51.3	60.9	68.8	67.0	56.4	43.1
Departure from Avegage	-1.0	4.2	-0.3	4.4	-9.6	1.4	-2.2	5.6	2.2	0.6	-1.0	2.0	0.5
Rank: Warm to Cold (124 yrs)	80	25	74	36	116	53	94	8	35	57	81	40	50
Rank: Cold to Warm (124 yrs)	44	99	50	89	9	72	31	117	90	68	44	85	74

Precipitation	0.88	0.61	0.92	0.63	1.34	1.74	1.54	3.36	4.15	3.29	1.88	0.85	21.19
20th Century Average	1.14	0.69	0.64	0.59	0.59	0.98	1.75	2.66	2.83	1.84	1.33	1.32	16.36
Percent of Average	77	88	144	107	227	178	88	126	147	179	141	64	130
Rank: Dry to Wet (124 yrs)	55	63	96	89	122	114	59	89	109	115	98	47	112
Rank: Wet to Dry (124 yrs)	69	61	28	46	3	11	66	36	16	10	27	78	12

Station Name:

Oct
2017

Nov
2017

Dec
2017

Jan
2018

Feb
2018

Mar
2018

Apr
2018

May
2018

Jun
2018

Jul
2018

Aug
2018

Sep
2018

Total for
WY 2017-18

click on location

for graph

Gillette Airport

None

1.12

0.49

0.71

0.69

1.10

1.86

1.02

1.94

4.77

1.50

2.18

1.12

18.52

1981-2010 Normals

1.27

0.55

0.40

0.39

0.96

1.47

2.45

2.21

1.66

0.95

1.19

13.89

Percent of Normal

178

177

282

194

216

229

133

Climate Division 7 - Cheyenne and Niobrara Drainages

Climate Division: Cheyenne and Niobrara (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	44.6	36.5	22.6	23.0	16.3	34.8	41.0	57.1	64.6	70.1	66.8	61.0	44.9
20th Century Average	45.8	31.8	23.0	20.3	24.6	32.1	42.5	52.4	62.5	70.3	68.4	57.6	44.3
Departure from Avegage	-1.2	4.7	-0.4	2.7	-8.3	2.7	-1.5	4.7	2.1	-0.2	-1.6	3.4	0.6
Rank: Warm to Cold (124 yrs)	84	20	75	51	113	39	85	8	36	69	91	19	48
Rank: Cold to Warm (124 yrs)	40	104	49	74	12	86	40	117	89	56	34	106	76

Precipitation	0.78	0.56	0.57	0.68	0.80	1.20	1.01	4.54	3.58	3.42	1.08	0.68	18.90
20th Century Average	0.95	0.55	0.48	0.42	0.46	0.76	1.68	2.53	2.34	1.78	1.21	1.14	14.30
Percent of Average	82	102	119	162	174	158	60	179	153	192	89	60	132
Rank: Dry to Wet (124 yrs)	53	74	91	105	109	103	30	113	113	118	56	43	118
Rank: Wet to Dry (124 yrs)	71	50	33	20	16	22	95	12	12	7	69	82	6

Climate Division 8 - Lower Platte Drainage

Climate Division: Lower Platte (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	43.9	39.5	27.2	28.7	23.1	36.4	42.1	55.3	64.0	69.4	65.8	61.4	46.4
20th Century Average	45.2	32.3	24.7	22.8	25.9	32.1	41.2	50.8	60.7	68.0	66.2	56.4	43.9
Departure from Avegage	-1.3	7.2	2.5	5.9	-2.8	4.3	0.9	4.5	3.3	1.4	-0.4	5.0	2.5
Rank: Warm to Cold (124 yrs)	88	4	34	13	89	25	55	5	21	41	70	4	10
Rank: Cold to Warm (124 yrs)	36	120	90	112	36	100	70	120	104	84	55	121	114

Precipitation	0.85	0.53	0.58	0.52	0.46	1.08	1.02	3.99	1.88	1.90	1.00	0.63	14.44
20th Century Average	1.05	0.68	0.63	0.51	0.59	0.97	1.90	2.55	2.05	1.58	1.17	1.21	14.89
Percent of Average	81	78	92	102	78	111	54	156	92	120	85	52	97
Rank: Dry to Wet (124 yrs)	49	48	64	70	41	79	25	108	65	89	52	38	52
Rank: Wet to Dry (124 yrs)	75	76	60	55	84	46	100	17	60	36	73	87	72

Station Name:					Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
click on location			D0	D1
for graph	D2	D3		D4
Casper Airport	None				1.08	0.31	1.37	0.68	0.62	1.00	1.03	2.86	1.63	1.62	0.33	0.28	12.81
1981-2010 Normals					1.11	0.76	0.49	0.51	0.57	0.82	1.29	2.02	1.61	1.41	0.85	1.08	12.52
Percent of Normal					97	41	280	133	109	122	80	142	101	115	39	26	102
Snowfall					5.6	3.6	19.4	12.3	18.6	6.5	5.7	T	0.0	0.0	0.0	0.0	71.7
1981-2010 Normals					7.4	10.3	11.0	9.1	9.8	10.9	11.6	2.9	0.1	0.0	0.0	1.8	74.9
Percent of Normal					76	35	176	135	190	60	49	0	0	0	0	0	96

Cheyenne Arpt	None				1.13	0.44	0.57	0.57	0.34	1.01	0.94	4.10	1.55	2.43	2.71	0.09	15.88
1981-2010 Normals					0.93	0.59	0.49	0.33	0.47	1.05	1.78	2.34	2.34	2.19	1.95	1.48	15.94
Percent of Normal					122	75	114	173	72	96	53	175	66	111	139	6	100
Snowfall					8.0	4.2	13.0	7.4	5.3	6.6	7.1	T	T	T	T	0.0	51.6
1981-2010 Normals					5.0	8.0	8.4	5.9	7.9	11.3	10.2	2.3	0.0	0.0	0.0	1.3	60.3
Percent of Normal					160	53	106	125	67	58	70	0	0	0	0	0	86

Climate Division 9 - Wind River Drainage

Climate Division: Wind River (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	40.3	33.4	23.1	24.6	18.9	32.2	39.3	51.5	58.8	66.7	63.0	56.4	42.4
20th Century Average	41.8	27.9	19.5	17.3	22.0	29.0	38.3	48.0	57.0	64.7	62.8	52.9	40.1
Departure from Avegage	-1.5	5.5	3.6	7.3	-3.1	3.2	1.0	3.5	1.8	2.0	0.2	3.5	2.3
Rank: Warm to Cold (124 yrs)	87	13	30	11	92	32	48	14	38	28	60	15	11
Rank: Cold to Warm (124 yrs)	37	111	94	114	33	93	77	111	87	97	65	110	113

Precipitation	0.92	1.65	1.37	0.68	1.20	1.14	1.29	3.69	2.10	0.72	0.52	0.20	15.48
20th Century Average	1.20	0.96	0.84	0.93	0.81	1.26	1.89	2.25	1.67	1.04	0.88	1.19	14.92
Percent of Average	77	172	163	73	148	90	68	164	126	69	59	17	104
Rank: Dry to Wet (124 yrs)	49	110	106	43	108	60	43	108	90	51	38	6	72
Rank: Wet to Dry (124 yrs)	75	14	18	82	17	65	82	17	35	74	87	119	52

Station Name:					Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
click on location			D0	D1
for graph	D2	D3		D4
Lander Airport	None				1.07	0.45	1.23	0.68	0.94	1.09	1.49	4.07	1.66	0.67	0.21	0.05	13.61
1981-2010 Normals					1.29	0.86	0.58	0.41	0.58	1.16	1.87	2.20	1.27	0.78	0.61	1.05	12.66
Percent of Normal					83	52	212	166	162	94	80	185	131	86	34	5	108
Snowfall					4.5	3.5	18.4	11.5	9.3	8.1	2.7	T	0.0	0.0	0.0	0.0	58.0
1981-2010 Normals					9.8	13.1	10.1	7.6	10.3	16.1	16.8	4.8	0.1	0.0	0.0	2.7	91.4
Percent of Normal					46	27	182	151	90	50	16	0	0	0	0	0	63

Riverton Airport	None				0.61	0.54	0.64	0.38	0.78	0.73	1.26	2.85	1.14	0.53	0.15	0.09	9.70
1981-2010 Normals					0.89	0.50	0.32	0.24	0.27	0.55	1.30	1.72	1.28	0.89	0.57	0.90	9.43
Percent of Normal					69	108	200	158	289	133	97	166	89	60	26	10	103
Snowfall					2.7	4.6	11.6	5.7	12.0	7.5	4.2	T	T	0	0	0	48.3

Dubois	None				0.95	1.70	0.74	0.22	0.52	0.56	1.26	3.20	2.88	0.65	0.74	0.10	13.52
1981-2010 Normals					0.81	0.57	0.28	0.24	0.38	0.40	1.10	1.64	1.28	1.11	0.86	1.24	9.91
Percent of Normal					117	298	264	92	137	140	115	195	225	59	86	8	136
Snowfall					13.0	17.1	10.7	3.2	7.6	5.6	8.5	2.0	0.0	0.0	0.0	0.0	67.7
1981-2010 Normals					3.0	5.8	5.1	3.9	5.7	6.0	8.5	3.9	0.6	0.0	0.0	2.6	45.1
Percent of Normal					433	295	210	82	133	93	100	51	0	0	0	0	150

Riverton	None				0.53	0.44	0.66	0.44	0.70	0.79	0.48	3.63	0.65	0.41	0.19	0.03	8.95
1981-2010 Normals					0.85	0.41	0.24	0.28	0.33	0.56	0.98	1.45	1.21	0.78	0.50	0.83	8.42
Percent of Normal					62	107	275	157	212	141	49	250	54	53	38	4	106
Snowfall					1.3	3.6	11.2	5.9	10.5	9.7	1.8	T	T	0.0	T	0.0	44.0
1981-2010 Normals					3.7	4.3	4.8	4.8	6.0	5.9	6.1	1.2	0.0	0.0	0.0	0.3	37.1
Percent of Normal					35	84	233	123	175	164	30	0	0	0	0	0	119

Climate Division 10 - Upper Platte Drainage

Climate Division: Upper Platte (Division Averages)	Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
Average Temperature	40.2	36.2	24.9	26.1	21.3	32.1	39.8	51.8	60.6	67.2	63.2	57.9	43.4
20th Century Average	41.8	28.3	20.2	18.3	21.7	28.0	37.5	47.4	57.1	64.5	62.6	52.9	40.0
Departure from Avegage	-1.6	7.9	4.7	7.8	-0.4	4.1	2.3	4.4	3.5	2.7	0.6	5.0	3.4
Rank: Warm to Cold (124 yrs)	91	5	13	6	69	26	36	6	19	20	51	4	6
Rank: Cold to Warm (124 yrs)	33	119	111	119	56	99	89	119	106	105	74	121	118

Precipitation	0.68	0.83	0.76	0.67	0.78	0.90	0.86	1.73	1.20	0.81	0.69	0.43	10.34
20th Century Average	1,09	0.83	0.82	0.80	0.83	1.06	1.58	1.78	1.27	1.10	0.93	1.08	13.19
Percent of Average	62	100	93	84	94	86	54	97	94	74	73	40	78
Rank: Dry to Wet (124 yrs)	36	63	57	45	60	50	19	67	64	37	43	17	16
Rank: Wet to Dry (124 yrs)	88	61	67	80	65	75	106	58	61	88	82	108	108

Station Name:					Oct 2017	Nov 2017	Dec 2017	Jan 2018	Feb 2018	Mar 2018	Apr 2018	May 2018	Jun 2018	Jul 2018	Aug 2018	Sep 2018	Total for WY 2017-18
click on location			D0	D1
for graph	D2	D3		D4
Jeffrey City	None				0.22	0.26	0.62	0.57	0.45	0.54	0.40	2.12	1.54	0.94	0.34	T	8.00
1981-2010 Normals					0.91	0.59	0.42	0.31	0.41	0.86	1.27	1.85	1.15	0.89	0.60	0.80	10.06
Percent of Normal					24	44	148	184	110	63	31	115	134	106	57	0	80
Snowfall					4.0	1.0	8.0	8.5	4.0	5.0	3.0	0.0	0.0	0.0	0.0	0.0	33.5
1981-2010 Normals					7.3	6.6	5.5	4.6	6.7	9.4	10.2	4.9	0.4	0.0	0.0	1.4	57.0
Percent of Normal					55	15	145	185	60	53	29	0	0	0	0	0	59

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