APRIL 2009 – Colder and Wetter than Normal Across Central Wyoming

Casper

 

Casper’s average monthly temperature was 52.1 degrees which was 4.0 degrees below normal.  Temperatures
ranged from 14 degrees on the 5th to 77 degrees on the 23rd. No daily temperature records were set during the month.

The monthly precipitation total of 2.05 inches was 0.53 inches above normal. Snowfall for the month was 16.5 inches
which was 2.7 inches above normal.

The peak wind gust was 49 mph out of the north on the 4th.

 

Casper’s Top 20 Snowiest Aprils

Rank  Snowfall  Month/Year

   1    56.3    4/1973
   2    33.6    4/1984
   3    24.2    4/1971
   4    23.3    4/1983
   5    22.8    4/1964
   6    21.9    4/1945
   7    21.5    4/1941
   8    21.2    4/1957
   9    21.0    4/1958
  10    20.8    4/1999, 4/1950
  12    19.5    4/1993
  13    19.4    4/1974
  14    18.9    4/2000
  15    17.8    4/1982
  16    17.5    4/1947
  17    17.0    4/1966
  18    16.5    4/2009
 
19    16.3    4/1986
  20    15.3    4/1955

 

 

 

Lander

 

Lander’s average monthly temperature was 52.2 degrees which was 4.3 degrees below normal.
Temperatures ranged from 16 degrees on the 5th to 74 degrees on the 22nd and 23rd
No daily temperature records were set during the month.

The monthly precipitation total of 3.61 inches was 1.54 inches above normal. Snowfall for the month
was 33.1 inches which was 13.2 inches above normal.   Lander has had 5.88 inches of precipitation so far
in 2009 which is 135 percent of normal.  5.65 inches of that precipitation has fallen since March 1st.

Snowfall so far this season, since July 1, 2007, is 114.9 inches, or 120 percent of normal for the season.

The peak wind gust was 53 mph out of the west on the 22nd.


Lander’s Top 20 Snowiest Aprils

 Rank  Snowfall Month/Year

   1    70.4    4/1999
   2    66.0    4/1973
   3    58.9    4/1945
   4    45.4    4/1984
   5    45.2    4/1971
   6    43.3    4/1983
   7    41.6    4/1892
   8    40.4    4/1957
   9    40.3    4/1933
  10    39.5    4/1968
  11    37.2    4/1970
  12    37.0    4/1967
  13    36.9    4/1991
  14    34.7    4/1975
  15    34.3    4/1966
  16    34.1    4/1927
  17    33.1    4/2009
 
18    32.7    4/1900
  19    31.8    4/1922
  20    29.8    4/1958

 

Riverton

Downtown Riverton’s average monthly temperature was 43.9 degrees which was 0.2 degrees below normal.  
Temperatures ranged from 18 degrees on the 5th to 76 degrees on the 22nd, 23rd and 24th.

The monthly precipitation total of 2.02 inches was 1.01 inches above normal. Snowfall for the month was 14.2 inches.
Downtown Riverton has had 3.42 inches of precipitation so far in 2009 which is 169 percent of normal. 

Snowfall so far this season, since July 1, 2007, is 49.9 inches.

Riverton’s Snowiest Aprils

 Rank  Snowfall Month/Year

   1    31.7    4/1999
   2    29.0    4/1920
   3    22.1    4/1945
   4    21.0    4/1922
   5    18.0    4/1927
   6    17.0    4/1979 (20), 4/1934
   8    16.0    4/1923
   9    15.5    4/1991 (1)
  10    15.0    4/1966, 4/1933
  12    14.2    4/2009
 
13    12.0    4/1957 (1), 4/1938, 4/1931
  16    11.3    4/2004
  17    10.0    4/1972
  18     9.6    4/2006
  19     9.5    4/1968, 4/1935

(n)= number of missing days of data in the period

 

Rock Springs

Rock Springs’ average monthly temperature was 32.2 degrees which was 0.6 degrees below normal.Temperatures
ranged from 14 degrees on the 5th to 71 degrees on the 23rd

The monthly precipitation total of 1.64 inches was 0.62 inches below normal. A daily precipitation record of
0.58 inches was set on the 25th, breaking the old record of 0.25 in 1991.

The peak wind gust was 59 mph out of the west on the 23rd.

 


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