United States · 1991–2020

Best time to visit
West Mifflin.

September leads for comfortable weather in West Mifflin: typically 24.7°C by day, 11.9°C at night, with 89 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.7°C

Typical low11.9°C

Rain in September89 mm

Comfort

September

September · August · May

80climate match

Beach

August

August · July · June

68climate match

Outdoors

October

October · May · September

72climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 3.3°C, 21° 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

53.3° / -5.9°

Feb

55° / -5.5°

Mar

1310.3° / -1.7°

Apr

4317.7° / 3.7°

May

6923° / 9°

Jun

6727.2° / 13.8°

Jul

6429.1° / 16.4°

Aug

7228.4° / 15.7°

Sep

8024.7° / 11.9°

Oct

5318.2° / 5.7°

Nov

2011.1° / 0.2°

Dec

55.7° / -3.4°

Monthly climate evidence for West Mifflin — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.3°C	-5.9°C	80 mm	11.3	9 h 35	5	Strong coverage
February	5°C	-5.5°C	55 mm	8.6	10 h 36	5	Strong coverage
March	10.3°C	-1.7°C	79 mm	9.4	11 h 49	13	Strong coverage
April	17.7°C	3.7°C	95 mm	11.2	13 h 13	43	Strong coverage
May	23°C	9°C	101 mm	11.8	14 h 24	69	Strong coverage
June	27.2°C	13.8°C	124 mm	11.5	15 h 02	67	Strong coverage
July	29.1°C	16.4°C	105 mm	10.1	14 h 47	64	Strong coverage
August	28.4°C	15.7°C	88 mm	8.7	13 h 46	72	Strong coverage
September	24.7°C	11.9°C	89 mm	8.4	12 h 25	80	Strong coverage
October	18.2°C	5.7°C	80 mm	8.9	11 h 04	53	Strong coverage
November	11.1°C	0.2°C	76 mm	9.2	9 h 53	20	Strong coverage
December	5.7°C	-3.4°C	90 mm	10.9	9 h 18	5	Strong coverage

Records at MCKEESPORT, 1959–2020
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.3°C31 Jan 2002	-28.3°C18 Jan 1994	48 mm5 Jan 2005	152 mm2005 · driest 26 mm in 2002	31
February	25.0°C25 Feb 2017	-28.3°C20 Feb 2015	51 mm11 Feb 2008	133 mm1975 · driest 14 mm in 2009	33
March	28.9°C31 Mar 1998	-18.3°C8 Mar 2015	51 mm6 Mar 2001	155 mm1989 · driest 23 mm in 1995	32
April	32.2°C28 Apr 1990	-8.3°C1 Apr 2011	76 mm20 Apr 2015	218 mm2015 · driest 32 mm in 1997	34
May	33.3°C29 May 1991	-6.1°C21 May 2006	71 mm6 May 1971	177 mm1997 · driest 45 mm in 2007	34
June	37.2°C30 Jun 2012	0.6°C23 Jun 2007	102 mm15 Jun 2015	292 mm2015 · driest 30 mm in 1999	34
July	38.3°C8 Jul 2012	3.9°C9 Jul 2005	77 mm20 Jul 1988	246 mm2013 · driest 23 mm in 1995	32
August	36.1°C17 Aug 1988	4.4°C5 Aug 2006	58 mm14 Aug 2006	252 mm1994 · driest 5 mm in 1971	35
September	35.0°C3 Sep 2010	-6.1°C16 Sep 2007	99 mm10 Sep 2018	301 mm2018 · driest 0 mm in 2007	33
October	32.8°C1 Oct 2019	-5.6°C30 Oct 1988	69 mm30 Oct 2012	187 mm2016 · driest 0 mm in 2007	33
November	26.1°C2 Nov 2004	-11.7°C30 Nov 2010	41 mm2 Nov 1992	172 mm1997 · driest 22 mm in 2009	32
December	23.3°C5 Dec 2001	-21.7°C31 Dec 2017	51 mm2 Dec 1991	160 mm2008 · driest 22 mm in 2017	31

Typical days per month at MCKEESPORT, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	2	5
February	0	0	23	2	3
March	<1	0	20	3	1
April	4	<1	8	3	0
May	12	4	1	4	0
June	22	8	0	4	0
July	28	13	0	4	0
August	27	10	0	3	0
September	15	4	<1	3	0
October	4	<1	4	3	0
November	<1	0	16	3	<1
December	0	0	24	3	2

How often, not how much — every day in MCKEESPORT’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%	32%	7%	40%	0.1–6.8°C
February	1%	29%	6%	36%	1.6–8.1°C
March	9%	31%	9%	40%	7.0–12.9°C
April	24%	33%	10%	42%	15.0–19.5°C
May	47%	33%	11%	43%	19.6–25.3°C
June	60%	32%	12%	39%	25.3–28.4°C
July	68%	28%	11%	29%	27.0–31.1°C
August	72%	25%	10%	25%	26.4–30.2°C
September	62%	24%	9%	24%	23.0–26.9°C
October	30%	24%	7%	26%	16.1–19.9°C
November	7%	27%	7%	30%	8.4–14.3°C
December	<1%	29%	7%	34%	2.0–8.4°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.

1988Each stripe is one year’s mean temperature against the 23-year average. Warmest: 2012. Coolest: 1996.2017

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5218802
NOAA station: USC00365573 · MCKEESPORT
Station distance: 2.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 40.36°, 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 MCKEESPORT is what differs

Monroeville→McKeesport→North Versailles→White Oak→Wilson→Clairton→

Or put two places side by side: West Mifflin vs Monroeville

Best time to visitWest Mifflin.