United States · 1991–2020

Best time to visit
Simpson.

September leads for comfortable weather in Simpson: typically 27.6°C by day, 13.7°C at night, with 69 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.6°C

Typical low13.7°C

Rain in September69 mm

Comfort

September

September · May · October

79climate match

Beach

August

August · June · September

72climate match

Outdoors

October

October · April · May

87climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 4.2°C, 20° below the 24°C the score treats as ideal, and nights drop to -8°C.

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

54.2° / -8°

Feb

56.9° / -6.2°

Mar

3413.2° / -1°

Apr

5718.8° / 4.7°

May

7624.1° / 10.9°

Jun

6130.6° / 17.2°

Jul

4333.2° / 20°

Aug

5631.8° / 18.8°

Sep

7927.6° / 13.7°

Oct

6820.3° / 6°

Nov

3212.4° / -1.1°

Dec

55.5° / -6.4°

Monthly climate evidence for Simpson — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.2°C	-8°C	17 mm	2.6	9 h 40	5	Strong coverage
February	6.9°C	-6.2°C	20 mm	3.1	10 h 39	5	Strong coverage
March	13.2°C	-1°C	36 mm	4.8	11 h 49	34	Strong coverage
April	18.8°C	4.7°C	66 mm	6.4	13 h 11	57	Strong coverage
May	24.1°C	10.9°C	111 mm	9.5	14 h 19	76	Strong coverage
June	30.6°C	17.2°C	96 mm	8.2	14 h 56	61	Strong coverage
July	33.2°C	20°C	123 mm	8.7	14 h 41	43	Strong coverage
August	31.8°C	18.8°C	91 mm	6.9	13 h 43	56	Strong coverage
September	27.6°C	13.7°C	69 mm	5.4	12 h 24	79	Strong coverage
October	20.3°C	6°C	50 mm	5.1	11 h 06	68	Strong coverage
November	12.4°C	-1.1°C	31 mm	3.6	9 h 57	32	Strong coverage
December	5.5°C	-6.4°C	27 mm	3.3	9 h 24	5	Strong coverage

What has changed

Simpson runs +0.0°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

+0.7

Feb

-0.7

Mar

+0.9

Apr

-0.8

May

-0.9

Jun

+0.4

Jul

-1.4

Aug

-1.5

Sep

+0.9

Oct

-0.3

Nov

+1.2

Dec

+1.7

September daytime highs, 2011–2025. Last recorded: 27.4°C.

Records at BELOIT, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.0°C31 Jan 1989	-32.8°C8 Jan 1913	36 mm16 Jan 2017	47 mm1979 · driest 0 mm in 2009	96
February	30.0°C29 Feb 1972	-29.4°C16 Feb 2021	51 mm25 Feb 1895	66 mm1895 · driest 0 mm in 1917	94
March	36.1°C22 Mar 2026	-24.4°C2 Mar 1913	69 mm23 Mar 1987	191 mm1973 · driest 0 mm in 1956	95
April	37.8°C24 Apr 1989	-13.9°C5 Apr 1920	90 mm15 Apr 2012	176 mm2012 · driest 5 mm in 1989	97
May	39.4°C12 May 1956	-2.8°C2 May 1911	84 mm17 May 1958	252 mm1995 · driest 0 mm in 1966	96
June	44.4°C30 Jun 1956	4.4°C1 Jun 1956	147 mm18 Jun 1915	338 mm1989 · driest 19 mm in 1911	97
July	45.0°C6 Jul 1964	7.8°C30 Jul 1971	161 mm4 Jul 1895	484 mm1993 · driest 0 mm in 1913	97
August	45.0°C3 Aug 1918	4.4°C28 Aug 1916	75 mm14 Aug 1974	220 mm2019 · driest 3 mm in 1894	95
September	42.8°C2 Sep 2000	-4.4°C29 Sep 1916	179 mm11 Sep 2003	213 mm1973 · driest 0 mm in 1956	94
October	37.2°C4 Oct 2006	-11.1°C30 Oct 1917	108 mm31 Oct 1979	153 mm2018 · driest 0 mm in 1999	95
November	30.6°C9 Nov 2006	-22.2°C28 Nov 1976	87 mm16 Nov 1996	136 mm1996 · driest 0 mm in 1914	96
December	28.3°C23 Dec 1964	-32.2°C22 Dec 1989	47 mm1 Dec 2018	88 mm2018 · driest 0 mm in 1956	96

Typical days per month at BELOIT, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	2
February	<1	0	24	<1	2
March	2	<1	19	1	1
April	6	2	6	2	<1
May	15	5	<1	4	0
June	27	18	0	3	0
July	30	25	0	4	0
August	29	21	0	3	0
September	21	11	<1	2	0
October	8	2	5	2	<1
November	<1	0	18	<1	<1
December	0	0	29	<1	2

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 80); on 2011–2025 it is September (81). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in BELOIT’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	<1%	8%	1%	2%	0.1–8.5°C
February	6%	11%	2%	7%	1.9–11.3°C
March	21%	15%	4%	11%	8.2–17.2°C
April	43%	21%	7%	19%	16.0–21.9°C
May	62%	28%	11%	33%	22.0–27.7°C
June	73%	27%	11%	29%	27.9–32.7°C
July	77%	23%	9%	23%	31.2–36.6°C
August	79%	21%	8%	18%	29.8–35.7°C
September	76%	19%	7%	16%	25.3–30.5°C
October	56%	14%	5%	11%	18.2–23.8°C
November	15%	10%	3%	6%	9.5–15.8°C
December	1%	9%	2%	3%	2.4–9.7°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.

1895Each stripe is one year’s mean temperature against the 88-year average. Warmest: 1921. Coolest: 1979.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4279429
NOAA station: USC00140693 · BELOIT
Station distance: 17.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 39.39°, 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 BELOIT is what differs

Beloit→Glasco→Asherville→Scottsville→Coursens Grove (historical)→Gilbert→

Or put two places side by side: Simpson vs Beloit

Best time to visitSimpson.