Historical Climate Data

Precipitation Summary
Station: 474821 LONE ROCK TRI CO, WI
1971-2000 NCDC Normals

Element	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC	ANN
Precip (in)	1.06	0.94	1.82	3.08	2.80	3.80	3.58	4.01	3.15	2.08	1.96	1.17	29.45

Precipitation Extremes
Period of Record: 1944-2001

Month	High (in)	Year	Low (in)	Year	1-Day Max (in)	Date
JAN	2.25	1967	0.12	1981	1.16	01-24-1967
FEB	2.96	1971	0.06	1958	1.52	02-27-1948
MAR	4.19	1973	0.26	1978	1.55	03-07-1973
APR	7.12	1999	1.09	1949	2.29	04-28-1975
MAY	6.99	1964	0.35	1981	3.72	05-18-2000
JUN	9.13	1949	1.18	1976	3.30	06-01-2000
JUL	8.74	1952	0.87	1967	3.63	07-01-1978
AUG	10.13	1959	0.08	1970	4.59	08-27-1959
SEP	11.07	1961	0.74	1975	4.19	09-12-1961
OCT	5.31	1959	0.04	1952	2.10	10-10-1954
NOV	5.10	1961	0.08	1976	2.62	11-02-1961
DEC	2.23	1968	0.05	2000	0.94	12-07-1967

Annual	40.49	1954	16.22	1958	4.59	08-27-1959
Winter	5.52	1971	1.19	1957	1.52	02-27-1948
Spring	14.62	1973	4.76	1980	3.72	05-18-2000
Summer	19.66	1981	5.88	1958	4.59	08-27-1959
Fall	19.85	1961	1.89	1900	4.19	09-12-1961

Precipitation Threshold Climatology
Derived from 1971-2000 Averages

*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding.

Month	# Days Total ≥ 0.01"	# Days Total ≥ 0.10"	# Days Total ≥ 0.50"	# Days Total ≥ 1.00"
JAN	8.8	3.1	0.3	0.0
FEB	7.8	2.7	0.6	0.1
MAR	9.1	4.7	1.1	0.3
APR	11.6	7.2	2.7	0.6
MAY	10.8	6.6	2.0	0.5
JUN	10.6	7.0	2.6	1.0
JUL	9.3	7.0	2.5	0.8
AUG	11.2	7.5	3.3	1.2
SEP	9.1	5.1	1.6	0.8
OCT	8.0	4.5	1.5	0.2
NOV	9.1	4.3	0.8	0.3
DEC	8.6	3.1	0.5	0.0

Annual	113.8	63.0	19.5	5.8
Winter	25.1	8.9	1.4	0.1
Spring	31.4	18.5	5.8	1.4
Summer	31.0	21.6	8.4	3.0
Fall	26.2	13.9	3.9	1.3