Historical Climate Data

Temperature Summary
Station: 473471 HATFIELD DAM, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	22.5	29.7	41.8	56.7	69.1	77.4	80.9	78.6	70.7	59.5	41.0	26.7	54.6
Min °F	0.5	5.2	18.4	30.9	41.7	51.7	56.6	54.8	44.6	34.3	20.8	7.6	30.6
Mean °F	11.5	17.5	30.1	43.8	55.4	64.6	68.8	66.7	57.7	46.9	30.9	17.2	42.6
HDD base 65	1659	1332	1082	636	321	85	32	63	232	562	1023	1482	8509
CDD base 65	0	0	0	0	24	71	148	117	12	0	0	0	372

Temperature Extremes
Period of Record: 1896-1998

Month	High Mean°F	Year	Low Mean°F	Year	1-Day Max°F	Date	1-Day Min°F	Date
JAN	26.1	1990	-5.6	1912	58	01-25-1944	-51	01-30-1951
FEB	30.7	1954	2.2	1936	62	02-21-1930	-51	02-01-1918
MAR	43.2	1910	20.3	1926	85	03-29-1986	-40	03-01-1962
APR	52.2	1955	37.3	1950	91	04-28-1952	-5	04-01-1924
MAY	64.8	1977	48.6	1924	96	05-22-1925	15	05-09-1947
JUN	73.9	1933	57.7	1969	103	06-01-1934	25	06-04-1945
JUL	76.4	1936	64.1	1992	108	07-14-1936	32	07-22-1947
AUG	74.1	1947	62.1	1927	104	08-01-1988	29	08-20-1950
SEP	66.2	1908	52.8	1993	100	09-06-1922	12	09-29-1949
OCT	56.3	1963	36.9	1917	94	10-01-1976	1	10-30-1925
NOV	40.6	1931	23.8	1951	78	11-01-1933	-24	11-29-1976
DEC	29.5	1931	8.6	1983	64	12-01-1962	-39	12-19-1983

Annual	49.3	1956	37.6	1976	108	07-14-1936	-51	01-30-1951
Winter	25.1	1983	8.5	1918	64	12-01-1962	-51	01-30-1951
Spring	51.2	1977	38.7	1924	96	05-22-1925	-40	03-01-1962
Summer	72.3	1988	63.6	1927	108	07-14-1936	25	06-04-1945
Fall	53.2	1931	40.3	1976	100	09-06-1922	-24	11-29-1976

Temperature Threshold Climatology
Derived from 1971-1998 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	21.2	30.8	14.3
FEB	0.0	14.5	27.7	10.5
MAR	0.0	4.2	26.8	3.5
APR	0.1	0.1	17.1	0.1
MAY	1.0	0.0	6.6	0.0
JUN	2.8	0.0	0.6	0.0
JUL	5.8	0.0	0.0	0.0
AUG	3.8	0.0	0.0	0.0
SEP	0.7	0.0	3.5	0.0
OCT	0.1	0.0	14.0	0.0
NOV	0.0	4.3	24.6	1.1
DEC	0.0	18.3	30.5	9.2

Annual	14.4	62.2	184.7	39.0
Winter	0.0	54.1	89.0	34.1
Spring	1.1	4.4	50.4	3.5
Summer	12.4	0.0	0.6	0.0
Fall	0.8	4.4	42.3	1.1