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2013 Climate Summary for Casper
Natrona County International Airport
  • 4th Coldest April
  • 6th Wettest April, 3rd Wettest October on Record
  • 7th Snowiest Year, 2nd Snowiest April, 4th Snowiest October on Record
  • Period of Record: 1940-2013
Temperature °F   Wind   Precipitation   Snowfall
 
Temperature °F
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average High
 35.8 36.1 48.1 49.2 69.5 84.3 89.8 89.1 76.4 52.9 46.5 30.3 59.0
 Mean High (1981-2010 Normals) 35.2 37.8 47.9 56.8 67.1 78.8 88.1 86.4 74.3 59.4 44.7 34.2 59.3
 Average Low  14.5  15.1 19.5 23.4 39.0 46.0 54.5 54.5 47.2 30.0 19.2 10.4 31.1
 Mean Low (1981-2010 Normals) 14.3 15.7 22.4 28.6 37.2 45.7 53.0 51.5 41.4 31.0 21.6 13.5 31.4
 Average Temperature  25.2 25.6 33.8 36.3 54.3 65.2 72.1 71.8 61.8 41.5 32.8 20.3 45.1
 Mean Average Temperature (1981-2010 Normals) 24.7 26.7 35.2 42.7 52.2 62.2 70.5 69.0 57.9 45.2 33.2 23.8 45.4
 Departure from Normal  0.5 -1.1 -1.4 -6.4 2.1 3.0  1.6 2.8 3.9 -3.7 -0.4 -3.5 -0.3
 Rank - Coldest to Warmest
 74 years of record
(P.O.R 12/1939-2013)
43 31 36  4 
51  61
 52 62 61  7   33 10 18
 Highest Daily Maximum  53 50 68 74 88 96  98 97 95 73 64 52 98
 Date of Occurrence  26 4 14,15 27 13,14 27  11,22 17 4 1 10 2 7/11, 7/22
 Lowest Daily Minimum -12 -5 3 4 21 32  48 47 27 19 -9 -22
 -22
 Date of Occurrence 12 10 25 9,18 2 4  31 16 20 5 23 4,6 12/4, 12/6
 Number of Days with:                          
    Maximum >= 90° 0 0 0 0 0 10  17 13 6 0 0 0 46
    Maximum <= 32° 12 10 4 6 0 0  0 0 0  1 3 14 50
    Minimum <= 32° 30 28 29 25 6 1  0 0 3 23  27 30 202
    Minimum <= 0°  6 2 0 0 0 0  0 0 0 0 3 9 20
 Record Highs Set or Tied 0 0 0 0 2 0 0 2 0 0 0 0 4
 Record Lows Set or Tied 0 0  0  3 0 0 0 0 0 1 0 1 5
 

Records set during 2013 (period of record 1940-2013):

Temperatures (degrees F):

Top 5 Coldest Aprils in Casper
Rank Year Average Temperature °F
1 1997,
1945
34.9
3 1973 36.1
4 2013 36.3
5 1975 37.7
 
    Number of Days with
Maximum >= 90°
Rank Year Number of Days
1 1988 57
2 2012 56
3 2000 53
4 2007 52
5 1994 51
6 1983,
1940
48
8

2013,
2006,
2001

46

 
Max

May: 88 on the 13th, 88 on the 14th.
August: 97 on the 17th, 96 on the 19th .

Min:  

April:  4 on the 9th, 4 on the 18th, 9 on the 23rd.
October: 
19 on the 5th (tie).
December:  -22 on the 4th
 
Casper 2013 Annual Summary - Temperature
 
Casper 2013 Annual Summary - Temperature (line graph)
              
 
Wind
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Average Speed (MPH) 16.4 13.0 11.1 12.3 10.4 9.3  7.8 8.1 10.2 10.4 13.4 16.3 10.6
 Maximum 3-sec Gust 60 46 58 52 47 51  51 60 59 39 53 52 60
 Direction (tens of degrees) 22 21 30 25 30 20 23 05 24 01 22  22 22, 05
 Date of Occurrence 10 14 17 29 30 18  30 8 30 4 16  9 1/10, 8/8
              
 
Precipitation
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Total (inches) 0.27 0.50 0.85 2.54 1.81 0.87 1.66 0.70 1.47 3.03 0.24 1.20 15.14
 Mean Precip (1981-2010 Normals) 0.51 0.57 0.82 1.29 2.02 1.61 1.41 0.85 1.08 1.11 0.76 0.49 12.52
 Departure from Normal -0.24 -0.07 0.03 1.25 -0.21 -0.74 0.25 -0.15 0.39 1.92 -0.52 0.71 2.62
 Percent of Normal 53 88 104 197 90 54 118 82 136 273 32 245 121

 Rank - Driest to Wettest
 74 years (P.O.R 12/1939-2013)

18  36  41   69 37   33 59 43 62 72  9  72 63
 Greatest 24-HR Total 0.15 0.21 0.37 0.86 1.24 0.37 1.15 0.60 0.86 1.68 0.23  0.51 1.68
 Dates of Occurrence 28 8-9 21-22 16-17 19 29-30 6-7 9 26-27 3-4 20-21 19-20 10/3-4
 Number of Days with:                          
    Precipitation >= 0.01 4 7 7 11 7 5 13 4 11 9 3 9 90
    Precipitation >= 0.10 1 2  4 8 3 5 4 1 5 7 1 3 44
    Precipitation >= 1.00 0 0  0 0 1 0 0 0 0 1 0 0 2
 Days with Thunderstorms 0 0 0 1 1 6 10 8 2 1 0 0 29
Daily Precipitaton Records Set or Tied 0 0  2 1 1 1 0 0 2 2 0 1 10
             
Records set during 2013 (period of record 1940-2013):

Precipitation:

Wettest Months on Record
April
Rank Year Precipitation (inches)
1 1941 5.75
2 1974 3.92
3 1973 3.86
4 1971 3.40
5 1964 3.09
6 2013

2.54

7 1957 2.45
 
October
Rank Year Precipitation (inches)
1 1998 4.62
2 1994 4.17
3 2013 3.03
4 1986 2.63
5 1962 2.49
 

One day Precipitation:

March  0.28 on the 21st, 0.14 on the 30th.
April  0.42 on the 8th.
May  1.24 on the 19th.
June:  0.34  on the 30th (tie).
September: 
0.29  on the 26th, 0.58 on the 27th.
October:  1.54 on the 3rd, 0.58 on the 27th.
December: 
0.50 on the 19th.
 
Casper 2013 Annual Summary - Precipitation (bar graph)
 
Casper 2013 Annual Summary - Precipitation (line graph)
 
 
Snowfall
Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
 Total (inches) 4.5 9.5 10.5 39.0 3.5 0.0 0.0 0.0 4.8 16.4 3.6 15.7 107.5
 Mean Snowfall (1981-2010 Normals) 9.1 9.8 10.9 11.6 2.9 0.1 0.0 0.0 1.8 7.4 10.3 11.0 74.9
 Departure from Normal -4.6 -0.3 -0.4 27.4 0.6 -0.1 0.0 0.0 3.0 9.0 -6.7 4.7 32.6
 Percent of Normal 49 97 96 336 121 0 0 0 267 222 35 143 144
 Rank - Least Snowiest to Snowiest
 74 Years (P.O.R 12/1939-2013)
 15 40 37
 73  50 NA NA NA  66 
 71 
14 65 68 
 Greatest 24-HR Total 2.0 5.1 3.4 10.5 3.5 0.0 0.0 0.0 4.8 12.4 2.3 7.1 10.5
 Dates of Occurrence 28 9 21 16 1 NA NA NA 27 4 21 27 4/16
 Number of Days with:                          
    Snowfall >= 1.0 inch 2 3 3 8 1 0 0 0 1 2  2 4 26
Daily Snowfall Records Set or Tied 0 0 1 2 1 0 0 0 1 1 0 1 7
            
Records set during 2013 (period of record 1940-2013):
 
Snowfall:

 

Top 10 Snowiest Years
Rank Year Snowfall (inches)
1 1982 137.6
2 1975 124.0
3 1984 121.2
4 1973 118.3
5 1983 114.2
6 1978 112.7
7 2013 107.5
8 1955 103.3
9 1979 103.0
10 1985 101.0
 

 

Snowiest Months on Record
April
Rank Year Snowfall (inches)
1 1973 56.3
2 2013 39.0
3 1984 33.6
4 1971 24.2
5 1983 23.3
 
October
Rank Year Snowfall (inches)
1 1949 22.1
2 2003 21.0
3 1998 20.2
4 2013 16.4
5 1986 16.1
 

One day Snowfall (inches):


March:  3.4  on the 21st.
April:  6.0  on the 8th, 10.5 on the 16th.
May:
  3.5  on the 1st.

September:
  4.8  on the 27th.

October:
  12.4 on the 4th.
December:  7.1 on the 19th.
 
Casper 2013 Annual Summary Snowfall - 2013 Annual Snowfall (bar graph)
 
Casper 2013 Annual Summary - Seasonal Snowfall (bar graph)
 
Casper 2013 Annual Summary - Seasonal Totals (line graph)
 
 
 


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