Historical Climate Data

Temperature Summary
Station: 478919 WATERTOWN, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	25.3	30.2	41.8	55.7	68.9	78.8	82.5	80.2	72.4	60.3	44.0	30.7	55.9
Min °F	7.1	12.0	23.6	35.0	46.3	56.1	61.1	58.9	50.2	39.0	27.4	14.3	35.9
Mean °F	16.2	21.1	32.7	45.4	57.6	67.5	71.8	69.6	61.3	49.7	35.7	22.5	45.9
HDD base 65	1514	1229	1003	591	273	48	9	34	151	479	880	1318	7529
CDD base 65	0	0	0	1	44	122	221	176	39	3	0	0	606

Temperature Extremes
Period of Record: 1896-2001

Month	High Mean°F	Year	Low Mean°F	Year	1-Day Max°F	Date	1-Day Min°F	Date
JAN	31.4	1933	0.4	1912	60	01-26-1944	-31	01-15-1963
FEB	34.3	1998	8.9	1917	64	02-12-1999	-33	02-20-1929
MAR	46.5	1945	20.7	1960	82	03-30-1910	-23	03-01-1962
APR	54.2	1915	36.6	1907	91	04-22-1980	10	04-03-1954
MAY	66.8	1977	50.1	1907	97	05-31-1934	22	05-11-1907
JUN	74.5	1933	61.3	1916	101	06-29-1931	31	06-04-1945
JUL	77.6	1921	66.9	1915	104	07-21-1901	41	07-31-1918
AUG	78.7	1947	62.5	1915	103	08-16-1937	36	08-30-1915
SEP	69.0	1931	53.9	1918	100	09-07-1939	20	09-30-1899
OCT	61.3	1947	39.8	1917	89	10-01-1971	7	10-30-1925
NOV	46.2	2001	28.0	1995	76	11-01-1944	-7	11-30-1897
DEC	35.2	1931	10.6	1983	66	12-06-2001	-27	12-24-1983

Annual	52.4	1931	41.2	1917	104	07-21-1901	-33	02-20-1929
Winter	31.6	1932	11.6	1917	66	12-06-1901	-33	02-20-1929
Spring	53.9	1977	41.0	1996	97	05-31-1934	-23	03-01-1962
Summer	73.9	1995	63.9	1915	104	07-21-1901	31	06-04-1945
Fall	56.9	1931	44.9	1917	100	09-07-1939	-7	11-30-1997

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	21.1	30.3	9.9
FEB	0.0	14.5	26.6	5.4
MAR	0.0	5.3	24.0	0.8
APR	0.0	0.3	10.0	0.0
MAY	0.5	0.0	1.0	0.0
JUN	3.2	0.0	0.0	0.0
JUL	5.1	0.0	0.0	0.0
AUG	2.9	0.0	0.0	0.0
SEP	0.7	0.0	0.5	0.0
OCT	0.0	0.0	7.2	0.0
NOV	0.0	4.1	20.2	0.1
DEC	0.0	15.2	28.8	4.6

Annual	12.6	60.6	148.1	20.8
Winter	0.0	50.9	85.6	19.8
Spring	0.6	5.6	34.8	0.8
Summer	11.3	0.0	0.0	0.0
Fall	0.7	4.0	27.6	0.1