April was wet month; Lander and Riverton received above normal snowfall, but drought lingers on

(Riverton, Wyo.) – A very wet month of April shot precipitation averages at many climate sites east of the divide from well below to well above normal for the month. Nearly SEVEN FEET of snow fell on Casper Mountain, over two feet fell in the town of Casper during the first two snow storms, likewise in Lander; a foot and a half fell in the town of Riverton. In fact, this is Casper’s second snowiest April on record with 37.8″ of snow and 81.0″ have fallen so far this season, with only 20.2 more inches needed to bring this season into the top 10 snowiest of all time.

In Lander, the month of April looked like it was going to be as dry as it was last year with snowfall over a foot below normal for the water year. However, the first two storms brought Lander into a surplus; it now stands at 23.7″ ABOVE normal for the entire month of April. The snowfall season (July 2012 – present) has now delivered 97.8″ of snow so far, putting Lander 14.9″ above normal for the year, and 34.5″ above where we were at this time last year. 

In Riverton, 24.7″ of snow has fallen this month, which is 18.6″ above normal for the month, and the 3rd snowiest April on record. Riverton has accumulated 54.5″ of snow through the current snowfall season (July 2012 – April 2013), or 20.9″ above normal for the season , and 34.1″ above where we were at this time last year. 

The April 16 – 17 snow storm in Casper moves into the number 16 spot for the biggest snowstorms on record:

Lander Top 24 Snowstorms since 1891
                                                                                                                                

Date   Storm Total Snowfall (Inches)               
1.   April 21-24, 1999 52.7
2.   November 9-13, 1978 36.7
3.   April 9-15, 1927 34.1
4.   May 4-8, 1978 33.1
5.   April 12-14, 1945 32.7
6.   May 19-21, 1975 31.5
7.   October 10-12, 2008 29.7
8.   March 28-30, 2007 29.7
9.   May 10-12, 1933 29.5
10. February 23-27, 1987 29.0
11. November 14-17, 1958 27.7
12. October 30-November 1, 1920 27.6
13. December 8-11, 1985 27.6 
14. November 9-13, 1985 27.3
15. May 1-5, 1898 27.1
16. October 27-29, 1971 27.1 
17. April 18-21, 1933 26.7
18. April 29-May 1, 1967 26.4
19. April 18-20 1973 26.3
20. February 2-6, 1955 25.7
21. April 25-27, 1984 25.2
22. April 3-5, 1983 24.6
23. April 18-21, 1892 24.4
24. April 19-22, 1971 24.4

 

Riverton Top 23 Snowstorms since 1907
                                                                                                                                

Date   Storm Total Snowfall (Inches)               
1.   February 23-27, 1987 22.0
2.    October 27-30, 1971 22.0
3.   December 9-10, 1985 19.0
4.   April 10-15, 1927 18.0
5.   April 22-24, 1999 17.5
6.   April 1, 1979 17.0
7.   April 21-23, 1923 16.0
8.   April 3-5, 1934 16.0
9.   October 29-31, 1920 15.0
10. October 11-12, 1928 15.0
11. April 18-19, 1966 15.0
12. December 22-23, 1979 15.0
13. November 10, 1978 14.5
14. November 5-7, 1920 13.0
15. March 20-22, 1924 13.0
16. February 23-24, 1935 13.0
17. October 8-9, 1961 13.0
18. October 27-30, 2003 12.6
19. December 2-3, 1955 12.5
20. March 9-11, 1968 12.5
21. November 12-14, 1985 12.5
22. April 1-3, 1999 12.2
23. October 10-12, 2008 12.1