United States · 1991–2020

Best time to visit
Elgin.

September leads for comfortable weather in Elgin: typically 23.7°C by day, 10°C at night, with 102 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.7°C

Typical low10°C

Rain in September102 mm

Comfort

September

September · August · June

76climate match

Beach

July

July · August · June

64climate match

Outdoors

September

September · May · October

71climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only -3.1°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

5-3.1° / -13.3°

Feb

5-1.4° / -12.9°

Mar

56.2° / -5.2°

Apr

2714.2° / 1.2°

May

5620.7° / 8°

Jun

6826.3° / 14.4°

Jul

6728.5° / 16.1°

Aug

7327.2° / 14.4°

Sep

7623.7° / 10°

Oct

4215.7° / 3°

Nov

87.5° / -3.3°

Dec

50° / -9.8°

Monthly climate evidence for Elgin — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-3.1°C	-13.3°C	29 mm	5.1	9 h 20	5	Good coverage
February	-1.4°C	-12.9°C	31 mm	4.6	10 h 27	5	Good coverage
March	6.2°C	-5.2°C	56 mm	6.2	11 h 47	5	Good coverage
April	14.2°C	1.2°C	107 mm	9.3	13 h 20	27	Good coverage
May	20.7°C	8°C	127 mm	11.1	14 h 37	56	Good coverage
June	26.3°C	14.4°C	150 mm	10.5	15 h 20	68	Good coverage
July	28.5°C	16.1°C	118 mm	8.2	15 h 03	67	Good coverage
August	27.2°C	14.4°C	110 mm	8.4	13 h 56	73	Good coverage
September	23.7°C	10°C	102 mm	8	12 h 26	76	Good coverage
October	15.7°C	3°C	77 mm	7	10 h 58	42	Good coverage
November	7.5°C	-3.3°C	53 mm	5.4	9 h 40	8	Good coverage
December	0°C	-9.8°C	37 mm	5.3	9 h 01	5	Good coverage

Records at POSTVILLE, 1897–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	15.6°C31 Jan 2025	-37.2°C12 Jan 1912	58 mm5 Jan 1946	75 mm1946 · driest 0 mm in 2025	72
February	22.2°C27 Feb 2024	-33.9°C1 Feb 1918	45 mm22 Feb 1922	99 mm1922 · driest 2 mm in 2022	73
March	28.3°C23 Mar 1910	-27.8°C2 Mar 1913	47 mm5 Mar 2004	127 mm2004 · driest 0 mm in 1910	74
April	31.1°C10 Apr 1930	-14.4°C6 Apr 1936	79 mm24 Apr 2008	249 mm2008 · driest 16 mm in 2021	73
May	40.6°C31 May 1934	-6.7°C9 May 1929	138 mm18 May 1902	458 mm1902 · driest 22 mm in 1929	74
June	40.0°C27 Jun 1934	1.1°C3 Jun 1990	95 mm19 Jun 2014	266 mm1925 · driest 22 mm in 1933	73
July	42.2°C21 Jul 1901	3.9°C25 Jul 1931	156 mm26 Jul 1940	276 mm1903 · driest 13 mm in 1936	72
August	38.9°C17 Aug 1988	1.7°C29 Aug 1934	115 mm13 Aug 1943	396 mm2007 · driest 13 mm in 1941	72
September	37.2°C7 Sep 1939	-6.7°C21 Sep 1918	117 mm11 Sep 2006	311 mm2018 · driest 4 mm in 1907	73
October	32.2°C1 Oct 2023	-21.7°C30 Oct 1925	112 mm14 Oct 2012	167 mm2017 · driest 5 mm in 1945	72
November	24.4°C1 Nov 1933	-24.4°C28 Nov 1989	71 mm4 Nov 2003	158 mm1931 · driest 1 mm in 2023	72
December	20.0°C16 Dec 2021	-32.8°C21 Dec 1989	63 mm14 Dec 2015	168 mm2015 · driest 4 mm in 1989	74

Typical days per month at POSTVILLE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	5
February	0	0	27	1	5
March	<1	0	24	2	2
April	2	<1	12	3	<1
May	8	2	2	5	0
June	20	5	0	5	0
July	27	11	0	3	0
August	24	6	0	3	0
September	13	3	<1	3	0
October	3	<1	10	2	<1
November	0	0	22	1	1
December	0	0	28	1	4

How often, not how much — every day in POSTVILLE’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%	18%	3%	11%	-7.4–0.6°C
February	<1%	17%	3%	10%	-5.8–2.0°C
March	4%	22%	6%	19%	1.8–10.1°C
April	16%	31%	10%	33%	11.0–17.1°C
May	39%	35%	14%	42%	18.0–23.9°C
June	60%	33%	14%	39%	22.4–27.9°C
July	72%	27%	11%	27%	25.7–29.9°C
August	70%	27%	12%	26%	24.4–28.6°C
September	54%	28%	11%	28%	20.2–25.2°C
October	24%	24%	7%	19%	13.1–18.9°C
November	3%	21%	6%	16%	3.5–9.7°C
December	0%	19%	4%	12%	-4.6–3.2°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.

1902Each stripe is one year’s mean temperature against the 63-year average. Warmest: 2012. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4855264
NOAA station: USC00136766 · POSTVILLE
Station distance: 15.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 18 usable years
Daylight: Calculated from latitude 42.96°, 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 POSTVILLE is what differs

Postville→Monona→Clermont→Farmersburg→Luana→Castalia→

Or put two places side by side: Elgin vs Postville

Best time to visitElgin.

September

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Elgin.

The whole year,
without the guesswork.

Nearby, measured,
and named.