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Allison Park, Pennsylvania climate

Cfa Humid subtropical

Allison Park has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 28°C, while the coldest is January averaging around −6°C at night. Precipitation is fairly even year-round, totalling about 1006 mm. Winters bring significant snowfall (112 cm of snow per year on average).

☀️ Summers

Warm

Highs near 28°C in July.

About 10 days a year above 32 °C

❄️ Winters

Cold

Lows near −6°C in January.

About 114 freezing nights a year

🌧️ Rain & snow

Moderate rainfall

About 1006 mm of rain a year, plus 112 cm of snow.

Snow falls through the winter months

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+0.5 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Allison Park climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	2	4	10	17	22	26	28	28	24	17	11	5
Avg temp (°C)	−2	0	4	11	16	21	23	22	18	12	6	1
Avg low (°C)	−6	−5	−1	5	10	15	17	17	13	7	1	−3
Precipitation (mm)	75	67	80	84	97	105	108	89	84	72	73	72
Snowfall (cm)	34	30	19	3	—	—	—	—	—	1	6	20

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	2	4	10	17	22	26
Avg temp (°C)	−2	0	4	11	16	21
Avg low (°C)	−6	−5	−1	5	10	15
Precipitation (mm)	75	67	80	84	97	105
Snowfall (cm)	34	30	19	3	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	28	28	24	17	11	5
Avg temp (°C)	23	22	18	12	6	1
Avg low (°C)	17	17	13	7	1	−3
Precipitation (mm)	108	89	84	72	73	72
Snowfall (cm)	—	—	—	1	6	20

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	17	14	14	14	14	12	11	11	10	11	12	15
Days with high ≥ 32°C (days)	—	—	—	—	0.3	2	4	3	0.9	—	—	—
Days with low ≤ 0°C (days)	25	23	19	6	0.5	—	—	—	—	2	14	23
Days with snowfall ≥ 2.5 cm (days)	4	4	2	0.3	—	—	—	—	—	0.1	0.7	3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	17	14	14	14	14	12
Days with high ≥ 32°C (days)	—	—	—	—	0.3	2
Days with low ≤ 0°C (days)	25	23	19	6	0.5	—
Days with snowfall ≥ 2.5 cm (days)	4	4	2	0.3	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	11	10	11	12	15
Days with high ≥ 32°C (days)	4	3	0.9	—	—	—
Days with low ≤ 0°C (days)	—	—	—	2	14	23
Days with snowfall ≥ 2.5 cm (days)	—	—	—	0.1	0.7	3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	76	75	71	70	68	62	57	56	54	62	69	76
Clear days (≤ 30% cloud)	2	2	4	4	4	5	7	7	9	6	4	2
Partly cloudy days (30–70%)	8	8	8	8	10	12	12	13	10	9	8	8
Cloudy days (≥ 70%)	21	18	19	18	17	13	12	11	11	15	18	21
Relative humidity (%)	88	86	82	78	78	76	71	68	70	75	81	86
Wind speed (km/h)	2.6	3.1	2.2	1.0	0.6	0.6	0.6	0.6	0.6	0.6	0.6	1.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	76	75	71	70	68	62
Clear days (≤ 30% cloud)	2	2	4	4	4	5
Partly cloudy days (30–70%)	8	8	8	8	10	12
Cloudy days (≥ 70%)	21	18	19	18	17	13
Relative humidity (%)	88	86	82	78	78	76
Wind speed (km/h)	2.6	3.1	2.2	1.0	0.6	0.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	56	54	62	69	76
Clear days (≤ 30% cloud)	7	7	9	6	4	2
Partly cloudy days (30–70%)	12	13	10	9	8	8
Cloudy days (≥ 70%)	12	11	11	15	18	21
Relative humidity (%)	71	68	70	75	81	86
Wind speed (km/h)	0.6	0.6	0.6	0.6	0.6	1.4

30-year delta table (1991–2020 minus 1981–2010, °F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Δ Max temp	+0.6	+0.3	-0.1	+0.7	+1.1	+0.3	+0.4	+0.3	+0.8	+0.5	-0.3	+1.2
Δ Avg temp	+0.4	+0.3	+0.1	+0.6	+1.1	+0.7	+0.6	+0.3	+0.8	+0.7	-0.3	+1.3
Δ Min temp	+0.3	+0.2	+0.3	+0.5	+1.3	+0.9	+0.6	+0.5	+0.8	+0.8	-0.4	+1.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Δ Max temp	+0.6	+0.3	-0.1	+0.7	+1.1	+0.3
Δ Avg temp	+0.4	+0.3	+0.1	+0.6	+1.1	+0.7
Δ Min temp	+0.3	+0.2	+0.3	+0.5	+1.3	+0.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Δ Max temp	+0.4	+0.3	+0.8	+0.5	-0.3	+1.2
Δ Avg temp	+0.6	+0.3	+0.8	+0.7	-0.3	+1.3
Δ Min temp	+0.6	+0.5	+0.8	+0.8	-0.4	+1.4

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Pittsburgh Asos (NOAA GHCN station USW00094823), about 23 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →