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Riverton Climate Summary Banner

...Highlights of 2025...

  • Annual: Period of Record is 107 years
    • 3rd Warmest year on record with 47.0 degrees F. (3.1degrees above normal)
    • 10th Hottest Summer at 69.8 degrees F.
    • 43rd Driest year on record with 9.37 inches. This is 98.6% of Normal
    • 26th Least Snowiest year on record with 44.9 inches. This is 101.4% of normal.
    • 30th Snowiest Snowfall Season (July 2024-June 2025) with 45.1 inches of snow.
  • Monthly Temperatures: 4th Warmest November and 1st Warmest December.
  • Monthly Precipitation:  9th wettest Jan (Tied 1933) and 5th wettest March
  • Monthly Snowfall: 6th Snowiest March.

 

Temperature Banner   

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average High 22.5 37.4 52.4 57.5 69.6 82.3 90.5 86.9 77.2 61.7 51.9 47.9 61.5
 Mean High (1991-2020 Normals) 28.7 35.5 49.2 58 67.4 78.9 87.9 85.7 74.4 59.2 42.7 29.6 58.1
 Average Low -1.5 11.3 24.5 30 41.3 49.7 55.5 53.7 46.3 33.7 24.5 21.1 32.5
 Mean Low (1991-2020 Normals) 4.2 9.6 22.2 30.5 40.3 48.5 54.8 52.2 42.5 30.4 17.1 5.7 29.8
 Average Temperature 10.5 24.4 38.5 43.8 55.5 66.0 73.0 70.3 61.8 47.7 38.2 34.5 47.0
 Mean Average Temperature (1991-2020 Normals) 16.4 22.5 35.7 44.2 53.8 63.7 71.3 69 58.4 44.8 29.9 17.6 43.9
 Departure from Normal -5.9 1.9 2.8 -0.4 1.7 2.3 1.7 1.3 3.4 2.9 8.3 16.9 3.1
 Rank: Coldest         to          Warmest
 107 years of record
(P.O.R 12/1918-2025)
22 60 95 51 73 82 84 89 95 81 105 105 101
 Highest Daily Maximum 37 60 77 81 86 96 99 99 87 84 72 65 99
 Date of Occurrence 12 25 28 12 13 20 10 21 3,4,11 4 3 25 7/10,8/21
 Lowest Daily Minimum -24 -7 0 13 29 36 49 46 38 17 1 -2 -24
 Date of Occurrence 21 13,19 8 19 2 23 12 9 18 29 30 1 1/21
 Number of Days with:                          
    Maximum >= 90° 0 0 0 0 0 7 20 12 0 0 0 0 39
    Maximum <= 32° 27 11 2 1 0 0 0 0 0 0 1 4 46
    Minimum <= 32° 31 28 26 17 4 0 0 0 0 13 24 27 170
    Minimum <= 0° 16 4 1 0 0 0 0 0 0 0 0 1 22
 Record Highs Set or Tied 0 0 1 0 0 1 0 0 2 0 1 2 7
 Record Lows Set or Tied 0 0 0 1 0 0 0 0 0 0 0 0 1
 * Multiple day occurrence

Temperature Ranks and Records:

 Daily Records:

 
Max:

 

   March: 77 on the 28
   June: 92 on the 2nd (tied 1977)
   August: 97 on the 20th (tied 2013) and 99 on the 21st
   November: 72 on the 3rd.
   December: 61 on the 12th (tied 1995) ad 59 on the 14th (tied 1924)

 

Min:  

    April: 13 on the 19th (tied 1966)

 

   Top Ten Warmest November's on Record
Rank Year Average Temperature °F
1 1949 40.0
2 2021, 1954 38.6
4 2025 38.2
5 1999 37.7
6 1927 37.0
7 2008 36.1
8 1926 36.0
9 1995 35.8
10 1965, 2016 35.7

 

   Top Ten Warmest December's on Record
Rank Year Average Temperature °F
1 2025 34.5
2 1933 31.8
2 2021 30.4
3 1950 29.2
4 1980 29.0
5 2024 28.4
6 1957/1946 27.7
8 1999 27.3
9 1939 27.2
10 1929 26.5

   

   Warmest Years on Record (100 Years)
Rank Year Average Temperature °F
1 2012 48.5
2 2021 47.1
3 2025, 2006, 1999 47.0
6 1934 46.9
7 2007 46.5
8 2024 46.4
9 2005, 1981 46.3
 

 

   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
103 2025 47.0
     

 

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 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) 0.51 0.06 1.42 1.42 0.91 1.36 0.46 0.41 0.88 1.44 0.34 0.16 9.37
 Mean Precipitation
(1991-2020 Normals)
0.35 0.43 0.71 1.31 1.98 1.09 0.70 0.45 0.80 0.93 0.44 0.31 9.5
 Departure from Normal 0.16 -0.37 0.71 0.11 -1.07 0.27 -0.24 -0.04 0.08 0.51 -0.10 -0.15 -0.13
 Percent of Normal 146 14 200 108 46 125 66 91 110 155 77 52 99

 Rank - Driest            to           Wettest
 107 years (P.O.R. 1918-2025)

96 18 103 73 25 68 53 53 69 86 51 44 65
 
 Greatest 24-HR Total 0.21 0.02 0.73 0.58 0.42 0.59 0.32 0.34 0.75 0.71 0.21 0.15 0.75
 Dates of Occurrence 5 16,19 7 17-18 6 6 31 27 23 16 17 3 9/23
 Number of Days with:                          
    Precipitation >= 0.01 7 4 9 12 9 6 3 3 4 4 3 2 66
    Precipitation >= 0.10 2 0 4 6 3 5 2 1 1 3 2 1 30
    Precipitation >= 1.00 0 0 0 0 0 0 0 0 0 0 0 0 0
Daily Precipitation Records Set or Tied 0 0 0 0 0 0 0 1 1 1 0 0 3
                           

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Precipitation Ranks and Records:
 

One Day Precipitation Records:

   August: 0.34" on the 28th

   September: 0.75" on the 23rd (tied 2016)

   October: 0.71" on the 6th.

     

   Top Ten Wettest Months of January on Record
Rank Year Precipitation (inches)
1 2023 1.57
2 1995 1.44
3 2017 1.12
4 1996 0.96
5 2014 0.63
6 1993 0.60
7 1953 0.56
8 1962 0.53
9 2025, 1932 0.51
10 2016 0.49
 

 

   Top Ten 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 2025 1.42
6 2021 1.24
7 1992 1.21
8 1977 1.20
9 2009 1.15
10 1968 1.05
 

 

   Top Ten Driest Years on Record
Rank Year Precipitation (inches)
1 1988 3.75
2 2012 3.98
3 1974 4.12
4 1954 4.85
5 2001, 2006 5.07
7 2020 5.62
8 1966 5.66
9 1990 5.71
10 1922 5.91
43 2025 9.37

 

   Top Ten Wettest Years on Record
Rank Year Precipitation (inches)
1 1923 18.43
2 2017 15.86
3 2023 15.51
4 2016 15.24
5 1941 14.74
6 1912 14.73
7 1993 13.49
8 1998, 1995 13.41
10 1971 13.11
65 2025 9.37
 

 

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 Annual Precipitation for Period of Record - Click on Graph to Enlarge
Click to enlarge
 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) 9.3 2.0 17.1 12.1 Trace 0 0 0 0 T 2.4 2 44.9
 Mean Snowfall (1991-2020 Normals) 5.5 7.4 6.5 7.2 2.1 0.0 0.0 0.0 0.6 4.4 5.3 5.3 44.3
 Departure from Normal 3.8 -5.4 10.6 4.9 -2.1 0.0 0.0 0.0 -0.6 -4.4 -2.9 -3.3 0.6
 Percent of Normal 169 27 263 168 0 0 0 0 0 0 45 38 101
  Rank - Least            to           Most
 107 years (P.O.R 1918-2025)
88 35 98 87 74 NA NA NA NA 44 43 33 83
 
 Greatest 24-HR Total 3.8 1 9 6.8 T 0 0 0 0 T 2.4 2 9
 Dates of Occurrence 18 19 7 17-18 6,16,19 n/a 0 0 0 6 29 3 3/7
 Number of Days with:                          
    Snowfall >= 1.0 inch 2 1 5 4 0 0 0 0 0 0 1 1 14
Daily Snowfall Records Set or Tied 0 0 1 0 0 0 0 0 0 0 1 1 3

 *   69 months of May on record a trace or 0.0" of snowfall.
 *  83 months of September on record with no snowfall.

 

 

 

 

 

 

 

 

 

 

 





 

First October with only a Trace of Snow (Last occurrence was 2016, 2015 and 2014)

 

Snowfall Ranks and Records:
 

One Day Snowfall Records (inches): 

  March: 9.0" on the 7th

  November: 2.4" on the 29th.

  December: 2.0" on the 2nd (tied 1992, 1924)

 
  
 
   Top Ten Snowiest Months of March on Record
Rank Year Snowfall (inches)
1 2015 22.1
2 1997 21.7
3 1967 19.5
4 1923 18.5
5 2022 17.8
6 2025 17.1
7 2008 15.2
8 1940 15.0
9 1972 14.0
10 2021 11.4

 

   Top Ten Snowiest Years on Record
Rank Year Snowfall (inches)
1 2023 92.0
2 1920 77.0
3 2017 71.1
4 2013 70.6
5 2009 62.5
6 2022 61.7
7 2020 61.7
8 2016 61.7
9 2010 60.1
10 1919 58.0
26 2025 44.9

 

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

  

 


 

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