Historical Climate Data

Temperature Summary
Station: 478349 SUPERIOR, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Max °F	20.8	26.5	35.1	47.0	58.9	68.5	76.2	73.9	65.9	53.8	38.0	25.1	49.1
Min °F	3.4	9.7	20.8	31.8	41.0	49.2	57.0	57.3	48.7	37.6	24.8	9.9	32.6
Mean °F	12.1	18.1	28.0	39.4	50.0	58.9	66.6	65.6	57.3	45.7	31.4	17.5	40.9
HDD base 65	1641	1314	1149	768	468	202	65	74	245	598	1009	1473	9006
CDD base 65	0	0	0	0	1	17	116	93	14	0	0	0	241

Temperature Extremes
Period of Record: 1909-2001

Month	High Mean°F	Year	Low Mean°F	Year	1-Day Max°F	Date	1-Day Min°F	Date
JAN	23.8	1944	-6.0	1912	55	01-24-1942	-37	01-29-1951
FEB	30.8	1998	-0.6	1936	60	02-22-1961	-38	02-12-1967
MAR	36.7	1910	15.6	1923	80	03-29-1946	-38	03-01-1962
APR	45.9	1955	31.8	1950	92	04-28-1952	-2	04-03-1954
MAY	54.6	1998	43.8	1909	96	05-31-1939	0	05-18-1999
JUN	64.5	1930	51.1	1917	98	06-18-1995	21	06-06-1983
JUL	72.1	1921	60.3	1915	105	07-14-1936	34	07-08-1961
AUG	71.6	1983	58.5	1950	99	08-24-1948	31	08-20-1950
SEP	62.8	1998	50.3	1918	97	09-08-1976	19	09-13-1963
OCT	54.6	1947	35.7	1917	89	10-02-1953	9	10-30-1925
NOV	42.1	2001	22.0	1911	74	11-17-1953	-19	11-28-1976
DEC	28.4	1931	3.2	1983	60	12-01-1962	-32	12-28-1917

Annual	47.5	1909	33.6	1967	105	07-14-1936	-38	02-12-1967
Winter	26.1	1998	5.0	1917	60	12-01-1962	-38	02-12-1967
Spring	42.7	1998	32.2	1950	96	05-31-1939	-38	03-01-1962
Summer	67.6	1988	57.8	1915	105	07-14-1936	21	06-06-1983
Fall	50.1	1931	39.8	1911	97	09-08-1976	-19	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	26.6	30.9	15.6
FEB	0.0	19.3	27.6	9.8
MAR	0.0	11.9	28.7	2.3
APR	0.0	1.3	17.9	0.0
MAY	0.2	0.1	3.2	0.1
JUN	0.7	0.0	0.0	0.0
JUL	2.0	0.0	0.0	0.0
AUG	1.2	0.0	0.0	0.0
SEP	0.2	0.0	1.2	0.0
OCT	0.0	0.0	9.3	0.0
NOV	0.0	8.7	24.3	1.1
DEC	0.0	22.0	30.4	9.7

Annual	4.2	90.9	174.6	39.0
Winter	0.0	67.8	88.9	35.1
Spring	0.2	13.1	49.5	2.4
Summer	3.9	0.0	0.0	0.0
Fall	0.2	8.8	35.2	1.1