Historical Climate Data

Temperature Summary
Station: 476678 PLYMOUTH, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	25.4	30.0	40.4	53.6	66.9	76.5	81.0	78.5	70.4	58.3	43.1	30.4	54.5
Min °F	9.0	13.0	23.0	34.2	45.0	54.6	60.1	58.5	49.8	39.5	28.0	16.1	35.9
Mean °F	17.2	21.5	31.7	43.9	56.0	65.6	70.6	68.5	60.1	48.9	35.6	23.3	45.2
HDD base 65	1482	1219	1032	633	310	81	17	37	172	500	884	1294	7661
CDD base 65	0	0	0	0	29	97	190	146	25	1	0	0	488

Temperature Extremes
Period of Record: 1910-2001

Month	High Mean°F	Year	Low Mean°F	Year	1-Day Max°F	Date	1-Day Min°F	Date
JAN	29.7	1990	1.4	1912	60	01-26-1944	-29	01-15-1972
FEB	31.6	1998	6.7	1936	64	02-27-2000	-27	02-09-1933
MAR	42.6	1945	22.6	1960	82	03-29-1910	-18	03-01-1962
APR	52.2	1915	37.6	1950	89	04-22-1980	8	04-03-1954
MAY	63.2	1977	48.8	1997	92	05-09-1934	21	05-09-1966
JUN	71.8	1933	59.1	1915	101	06-29-1931	30	06-04-1945
JUL	77.8	1921	64.6	1992	107	07-14-1936	39	07-05-1967
AUG	75.2	1937	63.0	1915	101	08-06-1918	36	08-30-1915
SEP	67.5	1931	54.9	1918	98	09-02-1953	25	09-26-1926
OCT	59.3	1947	39.5	1925	88	10-06-1963	6	10-30-1925
NOV	45.0	2001	27.3	1995	75	11-01-1944	-7	11-29-1976
DEC	33.5	1923	13.0	1983	67	12-06-2001	-20	12-28-1924

Annual	49.5	1987	37.6	1954	107	07-14-1936	-29	01-15-1972
Winter	29.0	1932	13.5	1918	67	12-06-1901	-29	01-15-1972
Spring	50.9	1977	39.0	1996	92	05-09-1934	-18	03-01-1962
Summer	73.8	1988	62.8	1915	107	07-14-1936	30	06-04-1945
Fall	54.5	1931	45.0	1926	98	09-02-1953	-7	11-29-1976

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	20.9	30.3	7.9
FEB	0.0	15.4	26.7	4.6
MAR	0.0	6.0	25.3	0.8
APR	0.0	0.5	12.6	0.0
MAY	0.1	0.0	2.3	0.0
JUN	2.1	0.0	0.0	0.0
JUL	3.5	0.0	0.0	0.0
AUG	1.5	0.0	0.0	0.0
SEP	0.4	0.0	0.5	0.0
OCT	0.0	0.0	6.4	0.0
NOV	0.0	4.2	20.6	0.1
DEC	0.0	16.0	29.0	4.2

Annual	7.8	62.8	152.9	17.5
Winter	0.0	52.5	86.1	16.7
Spring	0.1	6.5	40.3	0.8
Summer	7.2	0.0	0.0	0.0
Fall	0.4	4.1	27.4	0.1