Riverton 2016 Annual Climate Summary

Riverton Climate Summary Banner

...Highlights of 2016...

Annual: 2nd wettest year on record (1918-2016) with 181 percent of normal precipitation, 4th snowiest year on record with 166 percent of normal snowfall, 11th warmest year on record.
Seasonal: Wettest Spring (March, April, May) on record with 9.11 inches of precipitation, shattering the old record in 1971 by 1.25 inches.
Monthly Temperatures: 8th warmest March (tie), 3rd warmest June, 8th warmest November on record.
Monthly Precipitation: 8th wettest January (tie), 2nd wettest March, wettest April, 10th wettest September, 2nd wettest December on record.
Monthly Snowfall: Snowiest March, 6th snowiest December on record (snowiest Christmas Day on record with 6.5 inches).

Temperatures

Precipitation

Snowfall

Temperature Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Average High	27.4	44.1	51.9	58.0	64.5	86.7	89.5	84.6	73.4	63.5	49.9	25.4	61.0
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	3.2	16.3	25.8	34.0	39.4	51.1	54.3	50.4	44.4	34.3	21.5	2.3	31.4
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	15.3	30.2	38.9	46.0	52.0	68.9	71.9	67.5	58.9	48.9	35.7	13.8	45.7
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	-3.3	6.0	2.8	0.6	-2.6	5.1	0.8	-1.5	0.7	3.9	5.4	-3.6	1.2
Rank: Coldest to Warmest 99 years of record (P.O.R 12/1918-2016)	46	86	89	67	27	93	71	43	63	84	90	26	84
Highest Daily Maximum	46	63	67	78	80	97	98	97	90	79	71	46	98
Date of Occurrence	30	28	21	23	6	22	22	3	2	15	16	5	7/22
Lowest Daily Minimum	-16	-9	3	24	27	38	43	39	34	23	6	-26	-26
Date of Occurrence	12	3	19	2	11	1	12	20	10,25	20	18	17	12/17
Number of Days with:
Maximum >= 90°	0	0	0	0	0	13	17	9	1	0	0	0	40
Maximum <= 32°	22	5	0	0	0	0	0	0	0	0	3	22	52
Minimum <= 32°	31	28	30	10	4	0	0	0	0	15	29	31	178
Minimum <= 0°	12	3	0	0	0	0	0	0	0	0	0	13	28
Record Highs Set or Tied	0	1	0	0	0	0	0	0	0	0	1	0	2
Record Lows Set or Tied	0	0	0	0	0	0	0	0	0	0	0	0	0
* Multiple day occurrence

Temperature Ranks and Records:

Daily Records:

Max:

February: 63 on the 28th.
November: ^{71 on the 16th.}

Record High So Late in the Season: ^{71 on November 16th.}

Min:

None.

Warmest Months of March on Record
Rank	Year	Average Temperature °F
1	2012	43.9
2	1986	43.2
3	2007	42.2
4	1992	40.8
5	1934	40.5
6	1972	39.9
7	1940	39.2
8	2016, 1946	38.9
10	2000	38.7

Warmest Months of June on Record
Rank	Year	Average Temperature °F
1	1988	72.2
2	1977	69.3
3	2016	68.9
4	2006	68.8
5	2012	68.5
6	2015	68.4
7	1933	68.2
8	2013	67.6
9	2007	67.1
10	1961	66.9

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	2006	35.3

Warmest Years on Record (99 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
11	2016	45.7

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
84	2016	45.7


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

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Precipitation Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	0.49	0.19	2.70	3.82	2.59	0.12	0.13	0.22	1.75	1.55	0.75	0.93	15.24
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	0.21	-0.14	2.14	2.84	1.14	-1.09	-0.65	-0.28	0.92	0.70	0.34	0.69	6.82
Percent of Normal	175	58	482	390	179	10	17	44	211	182	183	388	181
Rank - Driest to Wettest 99 years (P.O.R. 1918-2016)	89	48	98	99	78	11	16	36	91	80	78	96	99
Greatest 24-HR Total	0.30	0.16	1.06	1.01	1.45	0.12	0.12	0.14	0.75	0.73	0.40	0.55	1.45
Dates of Occurrence	8	2	30	26	7	14	1	19	23	4	17	26	5/7
Number of Days with:
Precipitation >= 0.01	4	3	7	10	11	1	2	3	6	6	3	6	91
Precipitation >= 0.10	2	1	4	6	5	1	1	1	5	2	3	2	39
Precipitation >= 1.00	0	0	1	1	1	0	0	0	0	0	0	0	2
Daily Precipitation Records Set or Tied	1	0	3	2	1	0	0	0	1	0	0	3	7

Precipitation Ranks and Records:

One Day Precipitation Records:

January: 0.30" on the 16.
March: 0.48" on the 8th, 0.61" on the 29th, 1.06" on the 30th.
September: 0.75" on the 23rd.
November: 0.40" on the 17th.
December: 0.55" on the 26th.

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

Wettest Months of March on Record
Rank	Year	Precipitation (inches)
1	1998	2.95
2	2016	2.70
3	1941	1.52
4	1992	1.21
5	1977	1.20
6	2009	1.15
7	1968	1.05
8	1958, 1924	1.03
10	1938	0.98

Wettest Months of April on Record
Rank	Year	Precipitation (inches)
1	2016	3.82
2	1999	3.69
3	1944	3.47
4	1971	3.32
5	1941	2.96
6	1957	2.94
7	2004	2.80
8	1934	2.71
9	1945	2.32
10	1920	2.22

Wettest Springs (March, April, May) on Record
Rank	Year	Precipitation (inches)
1	2016	9.11
2	1971	7.86
3	1957	7.55
4	1921	6.74
5	2010	6.69
6	1944, 1924	6.19
8	1908	6.14
9	2011	5.65
10	1995	5.61

Wettest Months of September on Record
Rank	Year	Precipitation (inches)
1	1923	5.72
2	1973	4.45
3	1912	3.32
4	1950	3.19
5	2013	3.09
7	1982	2.89
8	1999	2.47
9	1989	2.15
10	2016	1.75

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

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
98	2016	15.24

Top Ten Wettest Years on Record
Rank	Year	Precipitation (inches)
1	1923	18.43
2	2016	15.24
3	1941	14.74
4	1912	14.73
5	1993	13.49
6	1998, 1995	13.41
8	1971	13.11
9	1947	12.45
10	1944	12.19


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

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Snow Banner

Element	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Total (inches)	7.7	2.7	22.1	9.0	T	0.0	0.0	0.0	0.0	T	7.3	12.9	61.7
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	2.9	-3.3	16.2	2.9	-1.2	0.0	0.0	0.0	-0.3	-3.7	3.0	8.1	24.6
Percent of Normal	160	45	375	148	0	0	0	0	0	0	170	269	166
Rank - Least to Most 99 years (P.O.R 1918-2016)	80	40	93*	69	2*	NA	NA	NA	1*	41*	71	85*	88*
Greatest 24-HR Total	4.1	2.5	10.8	4.6	0.0	0.0	0.0	0.0	0.0	T	5.0	6.5	10.8
Dates of Occurrence	8	2	30	27	NA	NA	NA	NA	NA	11	17	26	3/30
Number of Days with:
Snowfall >= 1.0 inch	2	1	5	3	0	0	0	0	0	0	2	3	20
Daily Snowfall Records Set or Tied	0	0	1	0	0	0	0	0	0	0	1	1	3
93* Months of March on record. * 3 months of May with a trace of snowfall. * 81 months of September on record with no snowfall. * 3 months of October with a trace of snowfall, 40 months of October with no snowfall reported. * 90 months of December on record. * 91 years with 12 months of snowfall on record (2016 was the 4th snowiest on record).

Snowfall Ranks and Records:

One Day Snowfall Records (inches):

March: 10.8" on the 30th.
November: 5.0" on the 17th.

December: 6.5" on the 26th.

Snowiest Months of March on Record
Rank	Year	Snowfall (inches)
1	2016	22.1
2	1998	21.7
3	1968	19.5
4	1924	18.5
5	2009	15.2
6	1941	15.0
7	1973	14.0
8	2003, 1938	11.0
10	1996	10.9

Snowiest Months of December on Record
Rank	Year	Snowfall (inches)
1	1985, 1972	19.0
3	1979, 1967	15.0
5	1968	14.5
6	2016	12.9
7	1955	12.5
8	1987	12.0
9	1982	11.9
10	1924	11.7

Snowiest Christmas Days on Record
Rank	Year	Snowfall (inches)
1	2016	6.5
2	2014	3.2
3	2003	3.0
4	1951	1.5
5	2008, 1919	1.0
Snowfall for Christmas Day is reported on 12/26.

Top Ten Snowiest Years on Record
Rank	Year	Snowfall (inches)
1	1920	77.0
2	2013	70.6
3	2009	62.5
4	2016	61.7
5	2010	60.1
6	1919	58.0
7	1923	56.2
8	1944	55.4
9	1987	53.5
10	1972	53.4



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

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