United States · 1991–2020

Best time to visit
Alton.

November leads for comfortable weather in Alton: typically 23.6°C by day, 9°C at night, with 52 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortNovember

Typical high23.6°C

Typical low9°C

Rain in November52 mm

Comfort

November

November · October · March

84climate match

Beach

May

May · October · September

71climate match

Outdoors

November

November · December · February

83climate match

The weakest month is August, scoring 24 against November’s 84 — days average 33°C, 9° above the 24°C the score treats as ideal, and 205 mm of rain falls.

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

4919° / 4.5°

Feb

6421° / 6.3°

Mar

7624° / 9°

Apr

7627.2° / 12.3°

May

6630.8° / 16.6°

Jun

3232.6° / 20.7°

Jul

2733.3° / 22°

Aug

2433° / 22.1°

Sep

4631.6° / 20°

Oct

7828.1° / 14.4°

Nov

8423.6° / 9°

Dec

6220.2° / 6°

Monthly climate evidence for Alton — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	19°C	4.5°C	118 mm	7.2	10 h 24	49	Strong coverage
February	21°C	6.3°C	85 mm	6.5	11 h 05	64	Strong coverage
March	24°C	9°C	105 mm	6.3	11 h 54	76	Strong coverage
April	27.2°C	12.3°C	79 mm	5.4	12 h 51	76	Strong coverage
May	30.8°C	16.6°C	79 mm	5.8	13 h 39	66	Strong coverage
June	32.6°C	20.7°C	186 mm	12.3	14 h 04	32	Strong coverage
July	33.3°C	22°C	191 mm	12.1	13 h 54	27	Strong coverage
August	33°C	22.1°C	205 mm	13.3	13 h 14	24	Strong coverage
September	31.6°C	20°C	144 mm	8.6	12 h 18	46	Strong coverage
October	28.1°C	14.4°C	74 mm	4.9	11 h 23	78	Strong coverage
November	23.6°C	9°C	52 mm	4.4	10 h 36	84	Strong coverage
December	20.2°C	6°C	85 mm	5.9	10 h 13	62	Strong coverage

What has changed

Alton runs +0.6°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

+2.1

Mar

+0.8

Apr

0.0

May

0.0

Jun

+0.1

Jul

+0.2

Aug

+0.3

Sep

+0.1

Oct

+0.5

Nov

+0.2

Dec

+1.8

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

Records at MAYO, 1949–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	31.1°C2 Jan 2021	-13.9°C21 Jan 1985	118 mm22 Jan 2010	263 mm1991 · driest 3 mm in 1950	76
February	33.9°C19 Feb 2020	-11.1°C2 Feb 2026	108 mm17 Feb 1998	308 mm1998 · driest 17 mm in 2001	76
March	33.3°C5 Mar 2023	-7.2°C3 Mar 1980	182 mm3 Mar 1991	325 mm1991 · driest 3 mm in 2020	76
April	35.6°C30 Apr 2012	-0.6°C11 Apr 1960	158 mm10 Apr 1958	273 mm1953 · driest 3 mm in 1986	76
May	38.3°C25 May 1953	5.0°C8 May 1992	209 mm29 May 2012	335 mm1959 · driest 5 mm in 1965	77
June	40.0°C19 Jun 1998	8.3°C1 Jun 1984	227 mm26 Jun 2012	689 mm2012 · driest 51 mm in 1988	76
July	39.4°C9 Jul 1981	13.3°C8 Jul 2010	142 mm26 Jul 1980	445 mm2013 · driest 21 mm in 1972	76
August	39.4°C1 Aug 1999	14.4°C25 Aug 1957	218 mm8 Aug 1994	460 mm1994 · driest 53 mm in 1984	77
September	37.2°C22 Sep 1997	4.4°C30 Sep 1967	371 mm12 Sep 1964	639 mm1964 · driest 5 mm in 1972	73
October	35.6°C2 Oct 1986	-2.8°C30 Oct 1952	140 mm8 Oct 1996	242 mm1996 · driest 0 mm in 2022	74
November	33.3°C5 Nov 2015	-7.2°C28 Nov 1956	99 mm15 Nov 2019	197 mm1951 · driest 2 mm in 2025	75
December	31.1°C14 Dec 2016	-12.2°C13 Dec 1962	119 mm17 Dec 2023	286 mm2018 · driest 3 mm in 1956	75

Typical days per month at MAYO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	5	0	9	4
February	8	<1	5	3
March	16	2	2	3
April	23	7	<1	2
May	30	22	0	3
June	29	26	0	6
July	31	29	0	6
August	31	28	0	6
September	29	23	0	3
October	26	12	0	2
November	13	1	2	2
December	7	<1	7	3

How often, not how much — every day in MAYO’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	35%	23%	11%	22%	15.6–22.1°C
February	47%	23%	10%	23%	17.2–23.7°C
March	66%	21%	11%	19%	21.5–26.1°C
April	81%	17%	7%	14%	25.7–28.9°C
May	79%	21%	9%	22%	29.3–32.0°C
June	62%	38%	17%	54%	31.5–34.0°C
July	57%	43%	20%	63%	31.8–34.3°C
August	58%	42%	20%	58%	31.9–34.1°C
September	71%	29%	12%	30%	30.2–32.8°C
October	84%	15%	6%	10%	26.5–29.3°C
November	67%	16%	6%	12%	21.6–25.7°C
December	43%	19%	9%	16%	17.6–22.8°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.

1950Each stripe is one year’s mean temperature against the 66-year average. Warmest: 1998. Coolest: 2010.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4145950
NOAA station: USC00085539 · MAYO
Station distance: 3.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 30.05°, 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 MAYO is what differs

Mayo→Day→Buckville→Chancey→Cooks Hammock→Dell→

Or put two places side by side: Alton vs Mayo

Best time to visitAlton.

November

May

November

The whole year,without the guesswork.

Alton runs +0.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Alton.

The whole year,
without the guesswork.

Alton runs +0.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.