United States · 1991–2020

Best time to visit
Sun Prairie.

September leads for comfortable weather in Sun Prairie: typically 22.9°C by day, 10.6°C at night, with 87 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high22.9°C

Typical low10.6°C

Rain in September87 mm

Comfort

September

September · August · June

78climate match

Beach

July

July · August · June

65climate match

Outdoors

September

September · May · October

77climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only -2.6°C, 27° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

5-2.6° / -11.2°

Feb

5-0.3° / -9.5°

Mar

56.6° / -3.8°

Apr

2914° / 2.1°

May

6220.7° / 8.4°

Jun

7226° / 14.1°

Jul

6928° / 16.4°

Aug

7626.8° / 15.2°

Sep

7822.9° / 10.6°

Oct

4415.5° / 4.3°

Nov

87.3° / -1.8°

Dec

50.3° / -7.7°

Monthly climate evidence for Sun Prairie — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.6°C	-11.2°C	37 mm	6.6	9 h 19	5	Strong coverage
February	-0.3°C	-9.5°C	39 mm	6.4	10 h 27	5	Strong coverage
March	6.6°C	-3.8°C	57 mm	7.6	11 h 47	5	Strong coverage
April	14°C	2.1°C	96 mm	9.5	13 h 20	29	Strong coverage
May	20.7°C	8.4°C	104 mm	9.5	14 h 39	62	Strong coverage
June	26°C	14.1°C	134 mm	9.4	15 h 22	72	Strong coverage
July	28°C	16.4°C	115 mm	7.9	15 h 05	69	Strong coverage
August	26.8°C	15.2°C	106 mm	7.5	13 h 57	76	Strong coverage
September	22.9°C	10.6°C	87 mm	6.8	12 h 27	78	Strong coverage
October	15.5°C	4.3°C	70 mm	7.4	10 h 57	44	Strong coverage
November	7.3°C	-1.8°C	56 mm	6.9	9 h 39	8	Strong coverage
December	0.3°C	-7.7°C	41 mm	6.9	9 h	5	Strong coverage

What has changed

Sun Prairie runs +0.8°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.7

Feb

+0.6

Mar

+1.4

Apr

-0.6

May

+0.3

Jun

+0.6

Jul

+0.2

Aug

+0.3

Sep

+1.6

Oct

+0.4

Nov

+0.8

Dec

+2.6

September daytime highs, 2011–2025. Last recorded: 24.9°C.

Records at MADISON DANE CO RGNL AP, 1939–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.7°C26 Jan 1944	-38.3°C30 Jan 1951	47 mm29 Jan 2013	73 mm2013 · driest 3 mm in 2025	87
February	21.1°C27 Feb 2024	-33.9°C3 Feb 1996	41 mm27 Feb 1948	84 mm2008 · driest 2 mm in 1995	87
March	28.3°C21 Mar 2012	-33.9°C1 Mar 1962	71 mm30 Mar 1998	157 mm2009 · driest 7 mm in 1978	87
April	34.4°C22 Apr 1980	-17.8°C7 Apr 1982	67 mm13 Apr 2014	185 mm2026 · driest 21 mm in 1942	87
May	35.0°C27 May 2018	-7.2°C1 May 1978	93 mm21 May 2004	275 mm2004 · driest 16 mm in 1981	87
June	38.3°C20 Jun 1988	-0.6°C10 Jun 1972	115 mm17 Jun 1996	278 mm2008 · driest 8 mm in 2012	87
July	40.0°C5 Jul 2012	2.2°C6 Jul 1965	99 mm3 Jul 1975	278 mm1950 · driest 24 mm in 1946	87
August	38.9°C16 Aug 1988	1.7°C27 Aug 1968	96 mm20 Aug 2018	386 mm2007 · driest 18 mm in 1948	86
September	37.2°C1 Sep 1953	-3.9°C29 Sep 1949	110 mm8 Sep 1941	251 mm1941 · driest 3 mm in 1979	86
October	32.2°C13 Oct 1975	-10.6°C30 Oct 1988	71 mm18 Oct 1984	149 mm2019 · driest 2 mm in 1952	87
November	25.0°C1 Nov 1944	-22.2°C25 Nov 1950	58 mm1 Nov 1971	190 mm2003 · driest 3 mm in 1976	87
December	20.0°C15 Dec 2021	-31.7°C19 Dec 1983	56 mm3 Dec 1990	104 mm1987 · driest 6 mm in 1960	87

Typical days per month at MADISON DANE CO RGNL AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	10
February	0	0	27	1	9
March	<1	0	23	2	5
April	1	<1	10	3	2
May	8	1	2	3	<1
June	19	6	0	4	0
July	26	9	0	3	0
August	23	6	0	3	0
September	11	2	<1	3	0
October	2	<1	7	2	<1
November	0	0	20	2	3
December	0	0	28	1	8

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 80); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in MADISON DANE CO RGNL AP’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	20%	3%	20%	-6.7–0.2°C
February	<1%	19%	3%	17%	-4.0–3.7°C
March	3%	25%	6%	28%	2.4–10.1°C
April	15%	30%	9%	34%	11.2–16.8°C
May	44%	29%	9%	35%	17.9–23.3°C
June	65%	29%	11%	34%	24.2–28.4°C
July	74%	25%	10%	24%	26.3–30.2°C
August	74%	24%	10%	24%	25.1–29.4°C
September	56%	23%	9%	25%	20.7–24.9°C
October	22%	22%	6%	23%	13.2–18.7°C
November	2%	23%	5%	22%	3.8–9.9°C
December	0%	22%	4%	20%	-3.4–3.4°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1940Each stripe is one year’s mean temperature against the 86-year average. Warmest: 2012. Coolest: 1972.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5275020
NOAA station: USW00014837 · MADISON DANE CO RGNL AP
Station distance: 11.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 43.18°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from MADISON DANE CO RGNL AP is what differs

Waunakee→Cottage Grove→Windsor→Maple Bluff→Burgess Corners→Burke→

Or put two places side by side: Sun Prairie vs Waunakee

Best time to visitSun Prairie.

September

July

September

The whole year,without the guesswork.

Sun Prairie runs +0.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Sun Prairie.

The whole year,
without the guesswork.

Sun Prairie runs +0.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.