Western and Central Wyoming

Weather Forecast Office

Riverton 2017 Annual Climate Summary

Riverton Climate Summary Banner

...Highlights of 2017...

Annual: 2nd wettest year on record (1918-2017) with 15.86 inches of precipitation which is 188 percent of normal, 2nd snowiest year on record with 71.1 inches of snowfall which is 192 percent of normal., Annual average temperature was slightly below normal.
Seasonal: Wettest first four months of the year (January though April) with a combined 9.23 inches of precipitation, shattering the old record of 7.20 inches set in 2016.
Monthly Temperatures: 8th coldest January, 3rd warmest March (tie) 10th warmest November on record.
Monthly Precipitation: 2nd wettest January, 5th wettest February, 3rd wettest March, wettest April, 10th wettest August on record.
Monthly Snowfall: Snowiest January, 6th snowiest February, 6th snowiest April on record.

Temperatures

Precipitation

Snowfall

Temperature Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average High	14.0	35.1	55.8	55.8	66.9	81.0	90.2	84.4	70.8	57.8	48.1	32.4	57.7
Mean High (1981-2010 Normals)	31.0	37.4	49.6	60.3	69.2	79.4	88.2	86.7	74.9	60.0	43.1	29.5	59.1
Average Low	-6.4	11.4	28.5	32.4	40.1	48.9	56.2	51.2	43.9	28.9	22.5	6.3	30.3
Mean Low (1981-2010 Normals)	6.2	11.0	22.5	30.6	40.1	48.1	54.0	51.4	41.4	30.0	17.6	5.4	29.9
Average Temperature	3.8	23.2	42.2	44.1	53.5	64.9	73.2	67.8	57.4	43.4	35.3	19.3	44.0
Mean Average Temperature (1981-2010 Normals)	18.6	24.2	36.1	45.4	54.6	63.8	71.1	69.0	58.2	45.0	30.3	17.4	44.5
Departure from Normal	-14.8	-1.0	6.1	-1.3	-1.1	1.1	2.1	-1.2	-0.8	-1.6	5.0	1.9	-0.5
Rank: Coldest to Warmest 100 years of record (P.O.R 12/1918-2017)	8	43	96	48	41	67	80	48	44	27	89	56	59

Highest Daily Maximum	41	56	73	77	84	92	97	93	94	74	63	57	97
Date of Occurrence	11	22	19	14	13	21	21	5	3	26	2	4	7/21
Lowest Daily Minimum	-33	-11	4	19	32	41	44	45	30	12	12	-22	-33
Date of Occurrence	6	3	1	5	14,18	13	1	16	27	31	30	24	1/6
Number of Days with:
Maximum >= 90°	0	0	0	0	0	4	21	8	2	0	0	0	35
Maximum <= 32°	29	13	0	0	0	0	0	0	0	0	0	13	55
Minimum <= 32°	31	28	24	13	2	0	0	0	2	25	26	31	182
Minimum <= 0°	22	6	0	0	0	0	0	0	0	0	0	7	35
Record Maximum Highs Set or Tied	0	0	2	0	0	0	0	0	0	0	0	1	3
Record Minimum Highs Set or Tied	0	0	0	0	1	0	1	0	0	0	0	0	2
Record Minimum Lows Set or Tied	1	0	0	0	0	0	0	0	0	0	0	0	1
Record Maximum Lows Set or Tied	0	0	3	0	1	0	0	1	2	0	3	0	10
* Multiple day occurrence

Temperature Ranks and Records:

Daily Records:

Record High Temperatures:

March 71 on the 16th, 73 on the 19th (tie).

December 57 on the 4th (tie).

Record Low Maximum Temperatures:

May: 37 on the 19th.

July 74 on the 26th (tie).

Record Low Temperatures:

January: -33 on the 6th.

Record High Minimum Temperatures:

March: 35 on the 14th (tie), 40 on the 23rd (tie), 43 on the 30th.

May: 50 on the 7th.

August: 62 on the 31st.

September: 63 on the 10th, 55 on the 11th (tie).

November: 35 on the 17th, 36 on the 23rd, 37 on the 24th.

Coldest Months of January on Record
Rank	Year	Average Temperature °F
1	1979	-7.3
2	1937	-3.1
3	1930	-1.4
4	1949	-0.4
5	1962	2.0
6	1963	2.8
7	1924	3.2
8	2017	3.8
9	1993, 1932	4.1

Warmest Months of March on Record
Rank	Year	Average Temperature °F
1	2012	43.9
2	1986	43.2
3	2017 ,2007	42.2
5	1992	40.8
6	1934	40.5
7	1972	39.9
8	1940	39.2
9	2016, 1946	38.9

Warmest Months of November on Record
Rank	Year	Average Temperature °F
1	1949	40.0
2	1954	38.6
3	1999	37.7
4	1927	37.0
5	2008	36.1
6	1926	36.0
7	1995	35.8
8	2016, 1965	35.7
10	2017, 2006	35.3

Warmest Years on Record (95 Years)
Rank	Year	Average Temperature °F
1	2012	48.5
2	2006, 1999	47.0
4	1934	46.9
5	2007	46.5
6	2005, 1981	46.3
8	1954	46.2
9	2015	46.0
10	1953	45.8
37	2017	44.0

Top Ten Coldest Years on Record
Rank	Year	Average Temperature °F
1	1993	38.8
2	1924	39.5
3	1984, 1944	39.7
5	1978	40.1
6	1985	40.3
7	1968, 1929	40.5
9	1975	40.8
10	1986, 1932	41.0
59	2017	44.0


Average Annual Temperature for Period of Record - Click on Graph to Enlarge

Learn more about the National Weather Service's efforts to build a Weather-Ready Nation!

Precipitation Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	1.12	0.96	2.45	4.70	1.34	0.49	0.37	1.09	1.71	0.53	0.44	0.66	15.86
Mean Precipitation (1981-2010 Normals)	0.28	0.34	0.56	0.98	1.45	1.21	0.78	0.50	0.83	0.85	0.41	0.24	8.42
Departure from Normal	0.84	0.63	1.89	3.72	-0.11	-0.72	-0.41	0.59	0.88	-0.32	0.03	0.42	7.44
Percent of Normal	400	291	438	480	92	28	47	218	206	62	107	275	188
Rank - Driest to Wettest 100 years (P.O.R. 1918-2017)	96	95	98	100	44	28	39	92	90	40	58	89	100

Greatest 24-HR Total	0.70	0.58	1.50	1.37	0.63	0.21	0.20	0.42	0.40	0.23	0.20	0.25	1.50
Dates of Occurrence	24	24	31	26	19	12	28	13	15,23	2	2	21	3/31
Number of Days with:
Precipitation >= 0.01	5	5	6	15	8	5	5	6	11	6	6	6	84
Precipitation >= 0.10	3	2	5	10	4	2	2	4	6	2	1	3	44
Precipitation >= 1.00	0	0	1	1	0	0	0	0	0	0	0	0	2
Daily Precipitation Records Set or Tied	2	0	2	2	0	0	0	1	0	0	0	1	8

Precipitation Ranks and Records:

One Day Precipitation Records:

January: 0.70" on the 24th, 0.23" on the 2nd.
March: 0.47" on the 24h, 1.50" on the 31st (also an all-time daily record for March)
April: 1.37" on the 1st, 0.73" on the 19th.
August: 0.23" on the 7th.
December: 0.25" on the 21st.

Wettest Months of January on Record
Rank	Year	Precipitation (inches)
1	1995	1.44
2	2017	1.12
3	1996	0.96
4	2014	0.63
5	1993	0.60
6	1953	0.56
7	1962	0.53
8	1932	0.51
9	2016, 1949, 1940	0.49

Wettest Months of February on Record
Rank	Year	Precipitation (inches)
1	2004	1.33
2	2015	1.28
3	2003	1.15
4	1986	0.97
5	2017	0.96
6	1955	0.90
7	1935	0.86
8	1920	0.80
9	2011	0.75
10	1987	0.68

Wettest Months of March on Record
Rank	Year	Precipitation (inches)
1	1998	2.95
2	2016	2.70
3	2017	2.45
4	1941	1.52
5	1992	1.21
6	1977	1.20
7	2009	1.15
8	1968	1.05
9	1958, 1924	1.03

Wettest Months of April on Record
Rank	Year	Precipitation (inches)
1	2017	4.70
2	2016	3.82
3	1999	3.69
4	1944	3.47
5	1971	3.32
6	1941	2.96
7	1957	2.94
8	2004	2.80
9	1934	2.71
10	1945	2.32

Wettest January - April Period on Record
Rank	Year	Precipitation (inches)
1	2017	9.23
2	2016	7.20
3	1944	4.79
4	1941	4.59
5	2004	4.23
6	1998	4.17
7	1995	3.86
8	1999	3.70
9	1971, 1945	3.58

Wettest Months of August on Record
Rank	Year	Precipitation (inches)
1	1933	3.06
2	1930	2.90
3	1976	1.56
4	1941	1.28
5	1968	1.24
7	2004	1.21
8	2014	1.11
9	1983	1.10
10	2017	1.09

Wettest Months of December on Record
Rank	Year	Precipitation (inches)
1	1955	0.96
2	2016	0.93
3	1997	0.89
4	1968	0.85
5	1982	0.79
7	1924	0.75
8	1972	0.72
9	1979	0.70
10	1985	0.68
11	2017	0.66

Top Ten Driest Years on Record
Rank	Year	Precpitation (inches)
1	1988	3.75
2	2012	3.98
3	1974	4.12
4	1954	4.85
5	2001, 2006	5.07
7	1966	5.66
8	1990	5.71
9	1922	5.91
10	1932	6.05
100	2017	15.86

Top Ten Wettest Years on Record
Rank	Year	Precipitation (inches)
1	1923	18.43
2	2017	15.86
3	2016	15.24
4	1941	14.74
5	1912	14.73
6	1993	13.49
7	1998, 1995	13.41
9	1971	13.11
10	1947	12.45


Annual Precipitation for Period of Record - Click on Graph to Enlarge

Click on Graph to Enlarge

Learn more about the National Weather Service's efforts to build a Weather-Ready Nation!

Snow Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	16.8	15.1	T	20.9	2.2	T	0.0	0.0	0.0	1.3	3.6	11.2	71.1
Mean Snowfall (1981-2010 Normals)	4.8	6.0	5.9	6.1	1.2	0.0	0.0	0.0	0.3	3.7	4.3	4.8	37.1
Departure from Normal	12.0	9.1	-5.9	14.8	1.0	0.0	0.0	0.0	-0.3	-2.4	-0.7	6.4	34.0
Percent of Normal	350	252	0	343	183	0	0	0	0	35	84	233	192
Rank - Least to Most 92-100 years (P.O.R 1918-2017)	92	90	7	90	78	NA	NA	NA	1*	56	48	81	91

Greatest 24-HR Total	9.0	11.2	T	7.9	1.2	T	0.0	0.0	0.0	0.8	2.4	4.0	11.2
Dates of Occurrence	24	24	6	4	19	12	NA	NA	NA	15	2	21	2/24
Number of Days with:
Snowfall >= 1.0 inch	4	2	0	5	2	0	0	0	0	0	1	4	18
Daily Snowfall Records Set or Tied	2	1	0	2	2	0	0	0	0	1	0	1	9
* 82 months of September on record with no snowfall.16 was the 4th snowiest on record).

Snowfall Ranks and Records:

One Day Snowfall Records (inches):

January: 5.3" on the 2nd, 9.0" on the 24th.
February: 11.2*" on the 24th (*all-time daily record for the month of February).
April: 7.9" on the 4th, 6.2" on the 10th.
May: 1.0" on the 18th, 1.2" on the 19th.
October: 0.8" on the 15th.

December: 4.0 on the 21st (tie).

Snowiest Months of January on Record
Rank	Year	Snowfall (inches)
1	2017	16.8
2	1962	16.5
3	1995	15.9
4	1993, 1949	12.5
6	1980	12.0
6	1984	11.5
7	1972	10.4
8	2005	10.3
9	2014	10.1
10	1944	10.0

Snowiest Months of February on Record
Rank	Year	Snowfall (inches)
1	1987	22.5
2	2015	17.8
3	2004	16.9
4	1959	16.0
5	2003	15.3
6	2017	15.1
7	1965	13.5
8	1935, 1920	13.0
10	2011	12.8

Snowiest Months of April on Record
Rank	Year	Snowfall (inches)
1	1999	31.7
2	1920	29.0
3	2013	24.7
4	1945	22.1
5	1922	21.0
6	2017	20.9
7	1927	18.0
8	1979, 1924	17.0
10	1923	16.0

Top Ten Snowiest Years on Record
Rank	Year	Snowfall (inches)
1	1920	77.0
2	2017	71.1
3	2013	70.6
4	2009	62.5
5	2016	61.7
6	2010	60.1
7	1919	58.0
8	1923	56.2
9	1944	55.4
10	1987	53.5



Annual and Seasonal Snowfall for Period of Record - Click on Graph to Enlarge

Learn more about the National Weather Service's efforts to build a Weather-Ready Nation!

Areas of Severe Thunderstorms and Excessive Rainfall Wednesday

Riverton 2017 Annual Climate Summary

Temperature Ranks and Records:

Precipitation Ranks and Records:

Snowfall Ranks and Records: