United States · 1991–2020

Best time to visit
Delavan.

August leads for comfortable weather in Delavan: typically 26.5°C by day, 15.4°C at night, with 100 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.5°C

Typical low15.4°C

Rain in August100 mm

Comfort

August

August · September · June

78climate match

Beach

July

July · August · June

67climate match

Outdoors

September

September · May · October

76climate match

The weakest month is January, scoring 5 against August’s 78 — days reach only -4.9°C, 29° 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

5-4.9° / -14.7°

Feb

5-2.4° / -12.3°

Mar

54.6° / -5.2°

Apr

2813.4° / 1.6°

May

5920.4° / 8.9°

Jun

7426° / 14.9°

Jul

6927.9° / 16.8°

Aug

7826.5° / 15.4°

Sep

7823.1° / 10.4°

Oct

4315.5° / 3.1°

Nov

56° / -4.1°

Dec

5-1.8° / -10.7°

Monthly climate evidence for Delavan — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.9°C	-14.7°C	24 mm	5	9 h 15	5	Strong coverage
February	-2.4°C	-12.3°C	25 mm	4.4	10 h 24	5	Strong coverage
March	4.6°C	-5.2°C	48 mm	6.2	11 h 47	5	Strong coverage
April	13.4°C	1.6°C	88 mm	8.8	13 h 22	28	Strong coverage
May	20.4°C	8.9°C	117 mm	10.4	14 h 42	59	Strong coverage
June	26°C	14.9°C	128 mm	9.9	15 h 26	74	Strong coverage
July	27.9°C	16.8°C	106 mm	8.1	15 h 09	69	Strong coverage
August	26.5°C	15.4°C	100 mm	7.7	13 h 59	78	Strong coverage
September	23.1°C	10.4°C	88 mm	6.7	12 h 27	78	Strong coverage
October	15.5°C	3.1°C	68 mm	6.2	10 h 56	43	Strong coverage
November	6°C	-4.1°C	42 mm	4.8	9 h 36	5	Strong coverage
December	-1.8°C	-10.7°C	32 mm	5.6	8 h 56	5	Strong coverage

What has changed

Delavan runs +1.1°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

+2.2

Feb

+0.3

Mar

+1.9

Apr

-0.5

May

0.0

Jun

+0.9

Jul

+0.2

Aug

+0.2

Sep

+2.7

Oct

+0.8

Nov

+1.5

Dec

+3.0

August daytime highs, 2011–2025. Last recorded: 26.8°C.

Records at WINNEBAGO, 1898–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.2°C26 Jan 1944	-37.2°C12 Jan 1912	48 mm4 Jan 1906	74 mm1975 · driest 0 mm in 1899	126
February	21.1°C27 Feb 2024	-35.6°C3 Feb 1996	50 mm2 Feb 1915	116 mm1915 · driest 0 mm in 1934	126
March	29.4°C23 Mar 1910	-31.7°C1 Mar 1962	74 mm30 Mar 2025	126 mm2025 · driest 2 mm in 1910	127
April	35.0°C28 Apr 1910	-17.8°C1 Apr 1924	78 mm28 Apr 1981	195 mm1999 · driest 3 mm in 1899	125
May	41.1°C31 May 1934	-6.7°C3 May 1967	90 mm18 May 2000	282 mm1908 · driest 11 mm in 1934	124
June	40.0°C27 Jun 1934	-0.6°C7 Jun 1907	96 mm18 Jun 1956	365 mm2024 · driest 18 mm in 1988	125
July	41.7°C14 Jul 1936	6.7°C31 Jul 1971	116 mm19 Jul 1963	244 mm1963 · driest 11 mm in 1975	125
August	41.1°C3 Aug 1930	2.2°C11 Aug 2004	158 mm10 Aug 1948	258 mm1940 · driest 18 mm in 2011	124
September	37.8°C7 Sep 1931	-5.6°C28 Sep 1942	220 mm25 Sep 2005	304 mm2005 · driest 6 mm in 2024	124
October	33.9°C1 Oct 2023	-17.8°C29 Oct 1925	97 mm26 Oct 2016	185 mm1998 · driest 0 mm in 1952	128
November	27.8°C9 Nov 2006	-25.0°C26 Nov 1977	66 mm12 Nov 2015	132 mm1909 · driest 0 mm in 1923	127
December	19.4°C2 Dec 1998	-34.4°C25 Dec 2000	38 mm10 Dec 1911	92 mm2015 · driest 0 mm in 1898	127

Typical days per month at WINNEBAGO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	6
February	0	0	28	<1	5
March	<1	0	25	2	3
April	2	<1	11	3	1
May	8	2	<1	4	0
June	19	6	0	4	0
July	25	9	0	4	0
August	21	5	0	3	0
September	12	3	<1	2	0
October	3	<1	10	2	<1
November	<1	0	23	1	3
December	0	0	30	<1	5

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 81); on 2011–2025 it is September (88). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in WINNEBAGO’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%	15%	1%	10%	-9.4–-0.7°C
February	0%	15%	2%	10%	-6.6–2.0°C
March	3%	19%	5%	18%	0.2–9.1°C
April	17%	27%	8%	32%	9.4–17.3°C
May	41%	32%	12%	40%	18.2–23.6°C
June	62%	32%	12%	39%	23.7–28.2°C
July	74%	25%	11%	27%	26.5–30.8°C
August	72%	26%	10%	28%	25.3–29.6°C
September	56%	23%	8%	24%	20.5–25.5°C
October	27%	19%	6%	18%	12.8–19.2°C
November	3%	16%	4%	13%	1.8–9.6°C
December	0%	15%	2%	10%	-6.4–1.7°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.

1899Each stripe is one year’s mean temperature against the 118-year average. Warmest: 1931. Coolest: 1950.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5024150
NOAA station: USC00219046 · WINNEBAGO
Station distance: 11.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 43.77°, 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 WINNEBAGO is what differs

Blue Earth→Winnebago→Marna→Guckeen→Hillcrest Park Mobile Home Park→Huntley→

Or put two places side by side: Delavan vs Blue Earth

Best time to visitDelavan.