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Mount Lebanon, Pennsylvania climate

Cfa Humid subtropical

Mount Lebanon has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 29°C, while the coldest is January averaging around −6°C at night. Precipitation is fairly even year-round, totalling about 1076 mm.

☀️ Summers

Warm

Highs near 29°C in July.

About 13 days a year above 32 °C

❄️ Winters

Cold

Lows near −6°C in January.

About 114 freezing nights a year

🌧️ Rain

Wet

About 1076 mm of rain a year.

Wettest in June

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+0.2 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 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

Mount Lebanon climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	4	5	11	18	23	27	29	29	25	18	12	6
Avg temp (°C)	−1	0	4	10	16	21	23	22	18	12	6	1
Avg low (°C)	−6	−6	−2	3	9	14	16	16	12	5	0	−4
Precipitation (mm)	77	65	81	96	101	127	105	90	88	81	76	90

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	4	5	11	18	23	27
Avg temp (°C)	−1	0	4	10	16	21
Avg low (°C)	−6	−6	−2	3	9	14
Precipitation (mm)	77	65	81	96	101	127

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	29	25	18	12	6
Avg temp (°C)	23	22	18	12	6	1
Avg low (°C)	16	16	12	5	0	−4
Precipitation (mm)	105	90	88	81	76	90

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	14	11	13	14	14	13	11	10	10	11	11	13
Days with high ≥ 32°C (days)	—	—	—	—	0.4	2	5	4	1	0.1	—	—
Days with low ≤ 0°C (days)	24	21	19	7	1	0.0	—	—	0.2	3	15	22
Days with snowfall ≥ 2.5 cm (days)	2	2	0.5	—	—	—	—	—	—	—	0.2	0.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	14	11	13	14	14	13
Days with high ≥ 32°C (days)	—	—	—	—	0.4	2
Days with low ≤ 0°C (days)	24	21	19	7	1	0.0
Days with snowfall ≥ 2.5 cm (days)	2	2	0.5	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	10	10	11	11	13
Days with high ≥ 32°C (days)	5	4	1	0.1	—	—
Days with low ≤ 0°C (days)	—	—	0.2	3	15	22
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	0.2	0.9

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	77	75	72	69	68	63	59	57	56	63	70	77
Clear days (≤ 30% cloud)	2	2	4	4	4	5	6	6	8	6	4	2
Partly cloudy days (30–70%)	8	8	8	8	9	11	13	13	10	9	8	8
Cloudy days (≥ 70%)	21	19	19	18	18	14	13	12	12	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 (%)	77	75	72	69	68	63
Clear days (≤ 30% cloud)	2	2	4	4	4	5
Partly cloudy days (30–70%)	8	8	8	8	9	11
Cloudy days (≥ 70%)	21	19	19	18	18	14
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 (%)	59	57	56	63	70	77
Clear days (≤ 30% cloud)	6	6	8	6	4	2
Partly cloudy days (30–70%)	13	13	10	9	8	8
Cloudy days (≥ 70%)	13	12	12	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

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Mckeesport (NOAA GHCN station USC00365573), about 16 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 →