Historical Climate Data

Precipitation Summary
Station: 479236 WILLOW RESERVOIR, WI

1971-2000 NCDC Normals

 

Element JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
Precip (in) 1.09 0.80 1.56 2.21 3.16 3.93 3.90 4.31 4.09 2.51 2.02 1.11 30.69

Precipitation Extremes
Period of Record: 1934-2001

Month High (in) Year Low (in) Year 1-Day
Max (in)		 Date
JAN 2.93 1997 0.14 1961 1.29 01-05-1997
FEB 2.76 1971 0.02 1987 1.20 02-21-1937
MAR 3.56 1977 0.18 1937 1.35 03-11-1973
APR 4.95 2001 0.48 1946 1.70 04-04-1981
MAY 8.18 1960 0.56 1986 3.22 05-06-1960
JUN 11.05 1981 1.27 1937 6.12 06-14-1981
JUL 8.32 1935 1.02 1998 3.76 07-01-1958
AUG 10.59 1995 0.38 1970 3.40 08-31-1973
SEP 10.67 1994 0.41 1952 4.27 09-08-1985
OCT 5.45 1995 0.12 1953 2.77 10-15-1966
NOV 6.25 1991 0.15 1939 2.32 11-13-1964
DEC 3.02 1968 0.00 1943 1.26 12-16-1940
 
Annual 43.45 1985 14.58 1976 6.12 06-14-1981
Winter 6.15 1971 0.94 1987 1.29 01-05-1997
Spring 12.74 1938 3.48 1980 3.22 05-06-1960
Summer 19.12 1938 4.81 1976 6.12 06-14-1981
Fall 18.48 1985 1.26 1976 4.27 09-08-1985

Precipitation Threshold Climatology
Derived from 1971-2000 Averages


*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding.

Month # Days
Total ≥ 0.01"		 # Days
Total ≥ 0.10"		 # Days
Total ≥ 0.50"		 # Days
Total ≥ 1.00"
JAN 9.1 3.9 0.2 0.0
FEB 6.3 2.9 0.2 0.0
MAR 7.9 4.2 0.8 0.1
APR 9.8 5.8 1.2 0.3
MAY 10.4 6.7 2.2 0.6
JUN 12.0 8.1 2.4 0.7
JUL 10.9 7.9 2.6 0.8
AUG 10.4 7.5 2.8 0.9
SEP 11.4 7.6 2.4 1.0
OCT 10.0 5.8 1.4 0.5
NOV 9.2 4.9 1.1 0.3
DEC 9.3 4.1 0.2 0.0
 
Annual 117.0 69.4 17.7 5.3
Winter 24.8 10.8 0.7 0.1
Spring 28.2 16.7 4.3 1.0
Summer 33.3 23.5 7.8 2.4
Fall 30.7 18.3 5.0 1.8