Historical Climate Data

Temperature Summary
Station: 475364 MERRILL, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	21.0	27.3	38.2	53.2	67.2	75.4	79.6	77.3	67.9	55.8	38.9	25.5	52.3
Min °F	-0.3	4.0	16.4	29.4	41.1	50.8	55.6	53.2	43.9	33.6	21.9	7.4	29.8
Mean °F	10.4	15.7	27.3	41.3	54.2	63.1	67.6	65.3	55.9	44.7	30.4	16.5	41.0
HDD base 65	1695	1382	1170	710	362	125	44	85	284	629	1038	1506	9030
CDD base 65	0	0	0	0	24	67	124	93	10	0	0	0	318

Temperature Extremes
Period of Record: 1905-2001

Month	High Mean°F	Year	Low Mean°F	Year	1-Day Max°F	Date	1-Day Min°F	Date
JAN	25.6	1944	-3.6	1912	57	01-23-1942	-48	01-12-1909
FEB	30.1	1998	0.2	1936	60	02-20-1930	-42	02-05-1907
MAR	42.1	1910	17.3	1923	86	03-27-1910	-35	03-01-1962
APR	52.2	1915	34.2	1907	92	04-28-1952	-5	04-01-1924
MAY	64.9	1934	47.3	1907	104	05-30-1934	15	05-06-1950
JUN	72.9	1933	56.3	1982	104	06-23-1934	28	06-04-1945
JUL	76.3	1916	61.8	1992	110	07-13-1936	33	07-04-1972
AUG	74.2	1937	60.0	1977	101	08-15-1936	30	08-30-1915
SEP	65.0	1908	48.9	1974	97	09-10-1931	18	09-22-1974
OCT	56.3	1963	37.5	1917	89	10-04-1905	4	10-30-1925
NOV	40.8	1909	21.9	1995	75	11-01-1909	-15	11-28-1976
DEC	28.4	1923	5.1	1989	62	12-01-1909	-31	12-19-1983

Annual	49.7	1931	34.8	1974	110	07-13-1936	-48	01-12-1909
Winter	24.3	1998	5.8	1977	62	12-01-1909	-48	01-12-1909
Spring	47.3	1977	34.0	1923	104	05-30-1934	-35	03-01-1962
Summer	71.5	1933	61.1	1992	110	07-13-1936	28	06-04-1945
Fall	51.9	1931	38.3	1976	97	09-10-1931	-15	11-28-1976

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	25.7	30.9	15.8
FEB	0.0	17.8	27.9	11.5
MAR	0.0	8.4	28.2	4.6
APR	0.0	0.8	18.9	0.0
MAY	0.0	0.0	6.3	0.0
JUN	0.8	0.0	0.6	0.0
JUL	1.9	0.0	0.0	0.0
AUG	0.9	0.0	0.2	0.0
SEP	0.1	0.0	3.5	0.0
OCT	0.0	0.1	15.9	0.0
NOV	0.0	8.3	26.2	1.3
DEC	0.0	22.5	30.6	10.0

Annual	3.8	84.2	190.3	43.3
Winter	0.0	66.0	89.4	37.4
Spring	0.0	9.3	53.4	4.6
Summer	3.7	0.0	0.7	0.0
Fall	0.1	8.5	45.7	1.3