Historical Climate Data

Temperature Summary
Station: 479236 WILLOW RESERVOIR, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	18.9	25.4	35.5	49.7	64.3	72.1	76.4	74.4	65.2	52.9	36.4	23.6	49.6
Min °F	-2.7	1.6	13.3	27.4	39.8	49.7	54.5	51.9	43.5	33.4	20.9	5.6	28.2
Mean °F	8.1	13.5	24.4	38.6	52.1	60.9	65.5	63.2	54.4	43.2	28.7	14.6	38.9
HDD base 65	1765	1441	1258	793	419	162	64	121	328	677	1090	1563	9681
CDD base 65	0	0	0	0	17	39	78	63	8	0	0	0	205

Temperature Extremes
Period of Record: 1948-2001

Month	High Mean°F	Year	Low Mean°F	Year	1-Day Max°F	Date	1-Day Min°F	Date
JAN	18.8	1990	-3.4	1977	51	01-26-1981	-45	01-17-1982
FEB	28.7	1998	3.9	1979	59	02-25-1976	-43	02-03-1996
MAR	34.4	1973	15.6	1960	71	03-08-2000	-40	03-01-1962
APR	47.6	1955	31.1	1950	88	04-28-1952	-14	04-07-1982
MAY	61.2	1977	45.6	1997	89	05-03-1959	15	05-10-1966
JUN	67.0	1995	54.8	1982	96	06-30-1963	23	06-14-1958
JUL	72.2	1955	60.7	1992	97	07-26-1955	30	07-01-1948
AUG	69.1	1959	58.7	1977	96	08-24-1948	28	08-29-1965
SEP	61.3	1998	48.9	1974	93	09-08-1976	18	09-29-1984
OCT	53.4	1963	37.4	1976	85	10-02-1953	7	10-27-1976
NOV	40.4	2001	20.3	1976	73	11-01-1950	-22	11-29-1985
DEC	24.8	1959	2.8	1985	59	12-03-1982	-35	12-21-1989

Annual	45.2	1998	35.9	1985	97	07-26-1955	-45	01-17-1982
Winter	23.0	1998	4.2	1979	59	12-03-1982	-45	01-17-1982
Spring	45.3	1977	32.4	1996	89	05-03-1959	-40	03-01-1962
Summer	67.5	1955	59.7	1992	97	07-26-1955	23	06-14-1958
Fall	48.3	1963	36.6	1976	93	09-08-1976	-22	11-29-1985

Temperature Threshold Climatology
Derived from 1971-2000 Averages

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

Month	# Days Max ≥ 90°F	# Days Max ≤ 32°F	# Days Min ≤ 32°F	# Days Min ≤ 0°F
JAN	0.0	28.0	30.9	17.2
FEB	0.0	19.7	27.9	13.5
MAR	0.0	11.8	29.3	6.8
APR	0.0	1.7	22.1	0.3
MAY	0.0	0.1	7.4	0.0
JUN	0.3	0.0	0.5	0.0
JUL	0.8	0.0	0.0	0.0
AUG	0.3	0.0	0.1	0.0
SEP	0.1	0.0	3.7	0.0
OCT	0.0	0.5	15.2	0.0
NOV	0.0	10.6	27.2	1.7
DEC	0.0	24.8	30.8	11.2

Annual	1.5	97.2	194.8	50.8
Winter	0.0	72.5	89.7	42.0
Spring	0.0	13.2	58.3	6.8
Summer	1.4	0.0	0.6	0.0
Fall	0.1	11.1	46.0	1.7