National Weather Service United States Department of Commerce

Snow Across the Great Lakes, Central Appalachians, and Northeast; Unsettled Weather in the West

Light to moderate snow will continue into Saturday over the Great Lakes, Central Appalachians, and Northeast. This weekend into next week, a series of atmospheric rivers will bring gusty winds, periods of heavy rain, and mountain snow to northern California and the Pacific Northwest. Colder temperatures are in store for the weekend from the Great Lakes to East Coast. Read More >

Casper Climate Summary Banner

 

...Highlights of 2023...

  • Annual:
    • 24th coldest year on record at 44.6 degrees, just 1 degrees below normal.
    • 11th wettest year with 15.41 inches, 126% of normal.
    • 5th snowiest year with 116.1 inches, 161% of normal.
    • 3rd snowiest snowfall season (July 2022-June 2023) with 134.5 inches.
    • Highest wind gust was 70 mph on April 27th.
       
  • Monthly Temperatures: 8th coldest March on record at 26.7 degrees. 3rd warmest December at 32 degrees.
     
  • Monthly Precipitation: 1st wettest January, 7th wettest June on record. New all-time daily high precipitation on January 11th with 0.55". 10th wettest October and 2nd driest December on record.
     
  • Monthly Snowfall: 2nd snowiest January and April and 10th snowiest February on record. New all-time daily snowfall on April 3rd with 26.7"

Temperature Banner   

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average High 27.4 29.9 37.5 51.7 70.3 73.2 88.0 84.5 78.9 59.5 47.6 42.6 57.6
 Mean High (1991-2020 Normals) 35.2 37.8 48.8 56.3 66.8 79.6 89 86.7 75.6 59.7 45.9 34.7 59.7
 Average Low 14.3 12.0 15.9 26.9 40.1 47.1 51.6 51.8 43.5 30.5 23.5 21.5 31.6
 Mean Low (1991-2020 Normals) 15 15.4 22.7 28.2 37.1 45.4 53 51.4 42.2 30.9 22 14.8 31.5
 Average Temperature 20.9 20.9 26.7 39.3 55.2 60.2 69.8 68.1 61.2 45.0 35.6 32.0 44.6
 Mean Average Temperature (1991-2020 Normals) 25.1 26.6 35.8 42.3 52 62.5 71 69 58.9 45.3 34 24.8 45.6
 Departure from Normal -4.2 -5.7 -9.1 -3 3.2 -2.3 -1.2 -0.9 2.3 -0.3 1.6 7.2 -1.0

 Rank: 84 years of record (P.O.R 12/1939-2023)

22 14 8 17 72 18 22 30 65 27 58 82 24
 
 Highest Daily Maximum 39 43 53 72 81 84 101 95 91 78 65 56 101
 Date of Occurrence 14,15 26 30 12 22,31 19 17 16,17 1 10 5 6 7/17
 Lowest Daily Minimum -21 -26 -6 3 26 38 40 36 33 2 -10 0 -26
 Date of Occurrence 30 23 8 5 1 17,25 7 31 26 27 25 25 2/23
 Number of Days with: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec  
    Maximum >= 90° 0 0 0 0 0 0 16 9 1 0 0 0 48
    Maximum <= 32° 21 14 9 4 0 0 0 0 0 3 5 3 59
    Minimum <= 32° 31 28 30 23 4 0 0 0 0 13 22 27 178
    Minimum <= 0° 4 5 1 0 0 0 0 0 0 0 1 1 12
 Record High Temperatures Set or Tied 0 0 0 0 0 0 1 0 0 0 0 2 3
 Record Low Temperatures Set or Tied 0 2 1 1 0 1 0 1 0 0 0 0 6

Temperature Ranks and Records:
 

 Daily Records:

 
Record High Temperatures:

 

  July: 101 on the 17th. 
  December: 55 on the 19th and 53 on the 21st (tie)
 

Record Low Temperatures:

  February: -17 on the 22nd and -26 on the 23rd.
  March:  -6 on the 8th (tie)
   April: 3 on the 5th
   June: 38 on the 25th (tie).
   August: 39 on the 14th.
    
 
Coldest Months of March on Record
Rank Year Average Temperature °F
1 1965 20.4
2 1964 25.1
3 1943 25.8
3 1944 25.8
3 2002 25.8
3 1955 25.8
7 1954 26.2
8 2023 26.7
9 1952 27.0
10 1958,1969 28.4
 

 

   Warmest Months of December on Record
Rank Year Average Temperature °F
1 1980 34.3
2 1946 33.0
3 2023 32.0
4 1957/1994 31.8
6 1950 31.2
7 1962 30.4
8 1959 30.3
9 2021 30.1
10 1999 29.9
 

 

   Top Ten Warmest Years on Record
Rank Year Average Temperature °F
1 1994 49.1
2 2012 48.7
3 1954 48.3
4 1981 48.1
5 1992 48.0
6 1940, 1953, 1963 47.3
9 2015, 2006, 1999 47.1
61 2023 44.6
 

 

   Top Ten Coldest Years on Record
Rank Year Average Temperature °F
1 1985 42.5
2 1951 43.1
3 1978 43.2
4 1964 43.5
5 2019, 1975 43.6
6 2009, 1979, 1968, 1949 43.8
10 1971 43.9
24 2023 44.6
 

 

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

  


 

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Wind Banner

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average Speed (MPH) 15 19.1 13.2 13.4 9.5 8 8.4 8.7 9.4 9.1
14.3
13.7
11.8
 Maximum 3-sec Gust 55 58 64 70 51 57 62 64 56 61 52
66
70
 Direction 210 220 210 350 230 290 290 280 230 260 280
250
350
 Date of Occurrence 9 21 10 27 6 20 3 27 4 10 5 7 4/27
Number of Days with:  
2-Min Wind >50 mph 0 0 0 1 0 0 0 0 0 0 0 0 1
Peak Wind >50 mph 2 4 2 4 1 1 6 4 2 1 1 2 30
Peak Wind >70 mph 0 0 0 1 0 0 0 0 0 0 0 0 1
              
 

 

 

 

 

 

 


 

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Precipitation Banner

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Total (inches) 1.99 0.69 0.65 1.49 2.03 3.29 1.33 1.01 0.59 1.88 0.40 0.06 15.41
 Mean Precipitation
(1991-2020 Normals)
0.49 0.56 0.84 1.41 2.21 1.34 1.19 0.79 0.95 1.19 0.64 0.61 12.22
 Departure from Normal 1.50 0.13 -0.19 0.08 -0.18 1.95 0.14 0.22 -0.36 0.69 -0.24 -0.55 3.19
 Percent of Normal 406 123 77 106 92 246 112 128 62 158 63 10 126

 Rank -
 84 years (P.O.R 12/1939-2023)

84 60 33 53 47 78 60 67 37 74 24 2 74
 
 Greatest 24-HR Total 0.80 0.49 0.39 0.90 0.53 0.88 0.49 0.29 0.23 1.62 0.40 0.04 1.62
 Dates of Occurrence 10-11 21-22 22 3 23-24 15-16 20 8 13-14 11-12 23-24 23-24

11-12 Oct

 Number of Days with:                          
    Precipitation >= 0.01 11 6 9 9 14 15 11 11 7 7 3 4 107
    Precipitation >= 0.10 7 3 1 2 9 9 3 4 2 3 2 0 45
    Precipitation >= 1.00 0 0 0 0 0 0 0 0 0 1 0 0 0
 Days with Thunderstorms 0 0 0 1 9 23 14 11 6 0 0 0 64
Daily Precipitation Records Set or Tied 5 1 0 2 0 1 0 0 0 1 1 0 11
                           

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Precipitation Ranks and Records:

 

One Day Precipitation Records:

   January: 0.27" on the 1st, 0.23" on the 2nd, 0.16" on the 10th, 0.55" on the 11th (all-time high), and 0.17 on the 18th

   February: 0.28h." on the 21st

   April: 0.90" on the 3rd and 0.37" on the 4th

   June: 0.51 on the 4th.

   October: 1.34" on the 12th.

   November: 0.29 on the 23rd (tie).

 


 

   Top Ten Driest December's on Record

Rank Year Precipitation (inches)
1 1952 0.03
2 2023 0.06
3 2004 0.07
4 1998/1999 0.10
6 2001 0.13
7 1969 0.16
8 2002 0.19
9 1974 0.22
10 1958/1962 0.23
 

 


 

   Top Ten Wettest January's on Record
Rank Year Precipitation (inches)
1 2023 1.99
2 1987 1.42
3 1949 1.36
4 1944 1.30
5 1984 1.19
6 2009 1.08
7 2016 0.99
8 1972 0.99
9 1996 0.94
10 2022 0.90
 

 

   Top Ten Wettest June's on Record
Rank Year Precipitation (inches)
1 2003 4.74
2 1982 4.15
3 1986 4.06
4 1983 3.76
5 1967 3.75
6 1995 3.62
7 2023 3.29
8 1947 3.11
9 1993 279
10 1998 2.67
 

 

   Top Ten Wettest October's on Record
Rank Year Precipitation (inches)
1 1998 4.62
2 1994 4.17
3 2013 3.03
4 2021 2.69
5 1986 2.63
6 1962 2.49
7 1972 2.04
8 1957/1949 2.00
9 1942 1.95
10 2023 1.88
 

 

   Top Ten Driest Years on Record
Rank Year Precipitation (inches)
1 2020 5.79
2 1988 6.56
3 2001 6.76
4 2002 7.05
5 1960 7.34
6 1954 7.70
7 2012 7.88
8 1963 7.90
9 1966 8.14
10 1943 8.91
74 2023 15.41

 

   Top Ten Wettest Years on Record
Rank Year Precipitation (inches)
1 1982 20.48
2 1995 18.94
3 1983 18.41
4 1978 17.64
5 1941 16.24
6 1957 16.12
7 1986 15.92
8 1993 15.91
9 2009 15.77
10 2016 15.57
11 2023 15.41
 

 

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 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) 37 16.4 9.4 39 0 0 0 0 0 2.8 10.5 1 116.1
 Mean Snowfall (1991-2020 Normals) 9 10.9 10.3 10.5 2.6 0.1 0 0 1.5 7 8.9 11 71.8
 Departure from Normal 28 5.5 -0.9 28.5 -2.6 -0.1 0.0 0.0 -1.5 -4.2 1.6 -10 44.3
 Percent of Normal 411 150 91 371 0 0 0 0 0 40 118 9 162
  Rank - Least to Most
 84 years (P.O.R 12/1939-2023)
83 75 34 83 NA NA NA NA NA 26 24 33 82
 
 Greatest 24-HR Total 9 6.8 4.8 26.7 0 0 0 0 0 2.2 6.4 0.6 26.7
 Dates of Occurrence 28 22 22 3 NA NA NA NA NA 26 23 23 04-3
 Number of Days with:                          
    Snowfall >= 1.0 inch 9 3 3 4 0 0 0 0 0 1 2 0 22
Daily Snowfall Records Set or Tied 4 2 0 2 0 0 0 0 0 0 1 0 8
* 50 months of September on record with no snowfall.

 

 

 

 

 

 

 

 

 

 

 



Snowfall Ranks and Records:

One Day Snowfall Records (inches):

   January:  7.3" on the first, 5.9" on the 2nd, 5.8" on the 11th and 9" on the 28th
   February: 4.6" on the 21st and 6.8" on the 22nd
    April: 26.7" on the 3rd (all-time highest) and 9.3 on the 4th
    November: 6.4" on the 23rd
       
 

 

   Snowiest Months of January on Record
Rank Year Snowfall (inches)
1 1949 39.3
2 2023 37.1
3 1987 24.0
4 1980 22.1
5 1984 19.4
6 1972 19.2
7 1965 16.5
8 2009 16.4
9 1979 16.3
10 1996,1962 16.2
 

 

   Snowiest Months of February on Record
Rank Year Snowfall (inches)
1 2020 28.4
2 1952 23.8
3 1987 22.7
4 1989,1955 21.5
6 2004 18.9
7 2018 18.6
8 1953 18.5
9 1995 16.9
10 2023 16.4
 

 

   Snowiest Months of April on Record
Rank Year Snowfall (inches)
1 1973 56.3
2 2023, 2013 39.0
4 1984 33.6
5 1971 24.2
6 1983 23.3
7 1964 22.8
8 1945 21.9
9 1941 21.5
10 1957 21.2
 

 

   Top Ten Snowiest Years on Record
Rank Year Snowfall (inches)
1 1982 137.6
2 1975 124.0
3 1984 121.2
4 1973 118.3
5 2023 116.1
6 1983 114.2
7 1978 112.7
8 2021 108.1
9 2013 107.5
10 1955 103.3

 

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

  

 


 

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