Rock Springs 2015 Annual Climate Summary

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Temperatures | Wind |Precipitation| Snowfall

...Highlights of 2015 ...

2nd Warmest Year on Record (over last 68 years, period of record 1948-2015).
19 record highs set or tied compared to only 1 record low
Major Flooding in Rock Springs on July 6th and 7th
Driest January, 3rd driest December while July was the 3rd wettest and May was the 5th wettest

Temperature Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average High	37.0	42.0	52.1	54.5	58.9	80.5	80.0	81.3	76.1	62.6	38.3	27.6	57.6
Normal Average High (1981-2010)	30.3	33.2	43.9	53.7	63.8	74.8	83.8	81.5	70.3	56.5	40.4	29.8	55.3
Average Low	21.0	20.8	25.9	30.1	38.1	51.7	53.0	51.6	47.1	40.0	18.8	11.5	34.1
Normal Average Low	12.5	14.8	23.1	29.4	37.7	46.4	54.0	52.2	42.7	32.3	21.2	12.5	31.7
Mean Temperature	29.0	31.4	39.0	42.3	48.5	66.1	66.5	66.5	61.6	51.3	28.6	19.5	45.9
Normal Mean Temperature	21.4	24.0	33.5	41.6	50.8	60.6	68.9	66.9	56.5	44.4	30.8	21.1	43.5
Departure from Normal	7.6	7.4	5.5	0.7	-2.3	5.5	-2.4	-0.4	5.1	6.9	-2.2	-1.6	2.4
Rank - Warmest to Coldest 68 years of record (P.O.R 1948-2015)	3	3	3	23	52	3	54	29	2	2	49	48	2
Highest Daily Maximum	53	57	70	72	80	91	89	89	83	78	62	53	91
Date of Occurrence	26	6	28,30	29	31	28,30	1,26	25	12,26	1	1,2	9	6/28,30
Lowest Daily Minimum	-16	-2	-3	17	29	45	43	42	36	28	-4	-15	-16
Date of Occurrence	1	23	4	3	10,11	4,12	29	18,19	19	27,28,30	29	28	1/1
Number of Days with:
Maximum >= 90°	0	0	0	0	0	2	0	0	0	0	0	0	2
Maximum <= 32°	8	7	4	0	0	0	0	0	0	0	6	21	46
Minimum <= 32°	30	25	23	22	5	0	0	0	0	4	28	29	166
Minimum <= 0°	1	1	2	0	0	0	0	0	0	0	2	6	12
Record Highs Set or Tied	3	7	4	0	0	0	0	0	2	1	1	1	19
Record Lows Set or Tied	0	0	0	0	0	0	0	0	0	0	0	1	1

Temperature Ranks and Records:

Daily Records:

Max:

January: 48 on the 18th, 47 on the 25th, 53 on the 26th
February: 53 on the 5th (tie), 57 on the 6th, 55 on the 7th, 50 on the 8th, 53 on the 9th, 55 on the 13th, 55 on the 14th
March: 68 on the 15th, 64 on the 16th, 66 on the 27th, 70 on the 28th
September: 83 on the 26th, 82 on the 27th
October: 74 on the 13th
November: 62 on the 2nd

December: 53 on the 9th

Min:

December: -15 on the 28th

October: 55 on the 1st set a a record for the warmest minimum temperature on record in October

Top Ten Warmest Years on Record
Rank	Year	Average Temperature °F
1	2012	47.3
2	2015	45.9
3	2003	45.5
4	1954	45.4
5	2014	45.3
6	1953, 1977	44.9
8	1988	44.8
9	1990	44.3
10	1958, 1999	44.1

Top Ten Coldest Years on Record
Rank	Year	Average Temperature °F
1	1993	39.6
2	1964	40.2
3	1984	40.9
4	1951	41.2
6	1961, 1973	41.4
7	1968	41.8
8	1975	41.9
9	2008	42.0
10	1949, 1971	42.1
49	2015	45.9

Wind Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average Speed (MPH)	12.3	14.0	10.6	11.9	10.6	8.6	8.7	9.6	9.7	10.7	14.3	10.8	11.0
Maximum 3-sec Gust	59	52	55	57	56	64	65	56	60	46	68	57	68
Direction (tens of degrees)	26	27	26	18	24	24	31	30	24	26	26	27	26
Date of Occurrence	5	7	28	14	15	1	15	27	4	11	18	9	11/18

Precipitation Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	0.01	0.08	0.22	0.67	3.10	1.11	2.12	0.37	0.58	0.15	0.17	0.04	8.62
Normal Precipitaton (1981-2010)	0.45	0.48	0.68	0.91	1.21	0.79	0.64	0.62	0.92	0.87	0.49	0.50	8.56
Departure from Normal	-0.44	-0.40	-0.46	-0.24	1.89	0.32	1.48	-0.25	-0.34	-0.72	-0.32	-0.46	0.06
Percent of Normal	2	17	32	74	256	141	331	60	63	17	35	8	101
Rank - Driest to Wettest 68 years (1948-2015)	1	6	7	28	64	45	66	25	34	9	15	3	36
Greatest 24-HR Total	0.01	0.05	0.10	0.28	0.87	0.80	1.13	0.18	0.33	0.08	0.06	0.03	1.13
Dates of Occurrence	12	3-4	2	26-27	18-19	15	6-7	29-30	15	3-4	4	14	7/6-7
Number of Days with:
Precipitation >= 0.01	1	4	3	8	17	5	9	4	3	4	6	2	66
Precipitation >= 0.10	0	0	1	2	10	2	4	2	2	0	0	0	23
Precipitation >= 1.00	0	0	0	0	0	0	0	0	0	0	0	0	0
Daily Precipitaton Records Set or Tied	0	0	0	0	1	0	4	0	1	0	1	0	6

Precipitation Ranks and Records:

One Day Precipitation Records:

May: 0.48 on the 18th
July: 0.17 on the 5th, 0.90 on the 6th, 0.32 on the 7th, 0.48 on the 8th
September: 0.33 on the 15^th

Top Ten Driest Years on Record
Rank	Year	Precpitation (inches)
1	2012	3.15
2	2014	4.24
3	1974	4.55
4	1988	4.56
5	2013	4.68
6	2002	4.98
7	1953	5.17
8	1951	5.41
9	1954	5.46
10	2001	5.57
39	2015	8.62

Top Ten Wettest Years on Record
Rank	Year	Precipitation (inches)
1	1965	14.57
2	1973	14.43
3	1978	13.40
4	1971	12.91
5	1957	12.67
6	1991	12.13
7	1993	11.89
8	1995	11.87
9	1963	11.74
10	1996	11.10
29	2015	8.62

Snow Banner

Element

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

Snowfall (inches)

0.0

1.5

4.5

T

0.0

7.0

11.0

24.0

Snowfall is from the Rock Springs COOP - RFSW4; Period of Record 2002-2015. 1981-2010 Normals are not available for this location.

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