United States · 1991–2020

Best time to visit
Charleroi.

September leads for comfortable weather in Charleroi: typically 25.5°C by day, 12.7°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low12.7°C

Rain in September88 mm

Comfort

September

September · May · June

79climate match

Beach

July

July · August · June

70climate match

Outdoors

October

October · May · April

76climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 4°C, 20° 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

54° / -5.7°

Feb

55.9° / -4.9°

Mar

1510.8° / -1.3°

Apr

4718° / 4.1°

May

7123.1° / 10°

Jun

7127.3° / 15°

Jul

6329.2° / 17.3°

Aug

6728.8° / 16.6°

Sep

7925.5° / 12.7°

Oct

5619° / 6.3°

Nov

2612.3° / 0.9°

Dec

56.5° / -2.9°

Monthly climate evidence for Charleroi — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4°C	-5.7°C	72 mm	9.7	9 h 36	5	Strong coverage
February	5.9°C	-4.9°C	69 mm	8.6	10 h 37	5	Strong coverage
March	10.8°C	-1.3°C	78 mm	9.5	11 h 49	15	Strong coverage
April	18°C	4.1°C	84 mm	10.8	13 h 13	47	Strong coverage
May	23.1°C	10°C	105 mm	11.1	14 h 22	71	Strong coverage
June	27.3°C	15°C	111 mm	10.9	15 h 01	71	Strong coverage
July	29.2°C	17.3°C	107 mm	9.4	14 h 46	63	Strong coverage
August	28.8°C	16.6°C	98 mm	8.8	13 h 45	67	Strong coverage
September	25.5°C	12.7°C	88 mm	8.2	12 h 24	79	Strong coverage
October	19°C	6.3°C	80 mm	9.2	11 h 04	56	Strong coverage
November	12.3°C	0.9°C	72 mm	8.6	9 h 54	26	Strong coverage
December	6.5°C	-2.9°C	75 mm	9.3	9 h 20	5	Strong coverage

What has changed

Charleroi runs -0.1°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

-0.1

Feb

+1.0

Mar

-0.5

Apr

-0.4

May

-0.6

Jun

-0.8

Jul

-0.1

Aug

-0.5

Sep

-0.2

Oct

-0.5

Nov

-0.4

Dec

+1.3

September daytime highs, 2011–2025. Last recorded: 26.3°C.

Records at DONORA 1 SW, 1926–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C26 Jan 1950	-28.3°C12 Jan 1982	51 mm6 Jan 2005	190 mm1937 · driest 2 mm in 2021	100
February	26.1°C21 Feb 2018	-25.6°C28 Feb 1934	57 mm16 Feb 2018	141 mm1956 · driest 7 mm in 1978	100
March	31.1°C25 Mar 1929	-18.9°C9 Mar 1960	66 mm6 Mar 1945	200 mm1967 · driest 1 mm in 1969	99
April	33.3°C18 Apr 1976	-11.7°C6 Apr 1975	72 mm30 Apr 2021	181 mm2011 · driest 11 mm in 2023	100
May	35.6°C26 May 1939	-5.6°C5 May 2005	76 mm6 May 1971	190 mm2003 · driest 9 mm in 1939	99
June	38.3°C8 Jun 1933	2.8°C5 Jun 1990	90 mm23 Jun 1972	270 mm1972 · driest 16 mm in 1967	97
July	40.6°C20 Jul 1930	4.4°C11 Jul 1983	88 mm29 Jul 1999	195 mm2013 · driest 6 mm in 1930	97
August	40.6°C23 Aug 1983	3.3°C29 Aug 1965	95 mm7 Aug 2000	249 mm1975 · driest 5 mm in 1951	99
September	39.4°C4 Sep 1953	-0.6°C29 Sep 1942	111 mm18 Sep 2004	206 mm1945 · driest 0 mm in 1959	99
October	35.0°C1 Oct 1953	-8.3°C29 Oct 1965	79 mm16 Oct 1954	182 mm1954 · driest 11 mm in 1933	100
November	29.4°C3 Nov 1961	-18.3°C30 Nov 1958	52 mm4 Nov 1950	269 mm1985 · driest 6 mm in 1976	100
December	25.0°C2 Dec 2006	-23.9°C22 Dec 1989	57 mm1 Dec 2010	162 mm2008 · driest 5 mm in 1955	99

Typical days per month at DONORA 1 SW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	2	5
February	<1	0	22	2	3
March	<1	0	18	3	2
April	5	<1	6	3	<1
May	12	3	<1	4	0
June	22	9	0	4	0
July	28	13	0	4	0
August	27	12	0	3	0
September	16	5	0	3	0
October	6	<1	2	3	0
November	<1	0	13	2	<1
December	0	0	22	3	3

How often, not how much — every day in DONORA 1 SW’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%	29%	7%	33%	0.9–8.3°C
February	2%	29%	7%	34%	2.2–9.5°C
March	10%	31%	9%	41%	7.5–15.1°C
April	31%	34%	10%	44%	15.7–21.2°C
May	54%	34%	11%	46%	21.2–26.4°C
June	67%	32%	12%	38%	25.9–29.9°C
July	71%	29%	11%	32%	28.1–31.5°C
August	74%	27%	10%	28%	27.1–31.0°C
September	69%	25%	9%	27%	23.9–27.9°C
October	41%	26%	8%	29%	17.3–22.1°C
November	12%	28%	7%	32%	9.7–15.3°C
December	1%	30%	7%	36%	2.9–9.6°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.

1927Each stripe is one year’s mean temperature against the 95-year average. Warmest: 1949. Coolest: 1961.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5183891
NOAA station: USC00362190 · DONORA 1 SW
Station distance: 3.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 40.14°, 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 DONORA 1 SW is what differs

Maple Glen→Monessen→California→Donora→Monongahela→Centerville→

Or put two places side by side: Charleroi vs Maple Glen

Best time to visitCharleroi.

September

July

October

The whole year,without the guesswork.

Charleroi runs -0.1°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Charleroi.

The whole year,
without the guesswork.

Charleroi runs -0.1°C
on the 1961–1990 baseline.

Nearby, measured,
and named.