Historical Climate Data

Temperature Summary
Station: 477997 SPARTA, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	23.6	30.2	42.0	56.9	69.8	78.9	82.9	80.5	71.5	59.7	42.2	28.4	55.6
Min °F	3.0	9.4	22.3	34.1	45.3	54.5	59.3	57.1	47.9	36.6	24.7	10.3	33.7
Mean °F	13.3	19.8	32.2	45.5	57.6	66.7	71.1	68.8	59.7	48.2	33.5	19.4	44.7
HDD base 65	1603	1265	1020	585	270	62	15	40	185	523	947	1416	7931
CDD base 65	0	0	0	1	38	113	205	157	26	1	0	0	541

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	23.2	1964	-1.7	1977	57	01-26-1981	-48	01-30-1951
FEB	32.7	1998	7.7	1979	62	02-23-1984	-41	02-03-1996
MAR	41.3	1973	22.0	1960	84	03-30-1986	-30	03-01-1962
APR	52.4	1955	39.5	1950	92	04-29-1952	-1	04-06-1982
MAY	65.0	1977	52.3	1954	92	05-02-1959	21	05-10-1966
JUN	71.8	1991	60.4	1982	100	06-21-1988	32	06-01-1964
JUL	77.3	1955	65.7	1992	105	07-14-1995	40	07-03-1968
AUG	75.3	1995	63.7	1977	102	08-02-1988	32	08-12-1982
SEP	64.9	1948	54.1	1993	96	09-09-1955	19	09-29-1967
OCT	58.9	1963	42.3	1976	90	10-06-1963	10	10-26-1962
NOV	46.5	2001	25.1	1976	76	11-09-1999	-18	11-27-1977
DEC	29.9	1959	7.3	1985	65	12-05-2001	-35	12-27-1950

Annual	49.2	1987	39.0	1980	105	07-14-1995	-48	01-30-1951
Winter	27.2	1998	7.9	1979	65	12-05-1901	-48	01-30-1951
Spring	51.8	1977	40.1	1996	92	04-29-1952	-30	03-01-1962
Summer	73.0	1995	65.3	1992	105	07-14-1995	32	06-01-1964
Fall	53.6	1963	41.6	1976	96	09-09-1955	-18	11-27-1977

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	23.0	30.7	13.6
FEB	0.0	14.5	27.3	8.2
MAR	0.0	5.8	25.9	2.0
APR	0.1	0.4	14.2	0.1
MAY	0.7	0.0	3.0	0.0
JUN	3.0	0.0	0.0	0.0
JUL	5.1	0.0	0.0	0.0
AUG	3.1	0.0	0.0	0.0
SEP	0.9	0.0	1.8	0.0
OCT	0.0	0.0	11.6	0.0
NOV	0.0	5.6	23.3	0.8
DEC	0.0	18.4	30.2	7.6

Annual	12.8	70.5	172.0	33.6
Winter	0.0	55.8	88.2	29.5
Spring	0.8	6.4	43.1	2.2
Summer	11.1	0.0	0.0	0.0
Fall	0.9	6.2	39.1	0.8