Best year time to visit Allegheny County

General weather information about Allegheny County

Average annual temperature is 12.6 °C

Absolute maximum temperature: 34.1 °C

Absolute minimum temperature: -11.2 °C

Number of sunny days: 148 days

Number of rainy days: 207 days

Number of snow days: 10 days

Look at detailed online map of Allegheny County

* Weather data for Allegheny County United States is based on climate observations for 2026 year

Allegheny County air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)16.421.321.228.131.033.632.532.034.128.018.716.3
Average daytime temperature (°C)7.711.110.619.022.426.128.727.524.518.511.69.1
Average temperature (°C)3.64.54.912.115.920.123.321.919.113.76.35.0
Average night temperature (°C)0.6-0.30.66.39.914.919.017.414.69.82.32.0
Absolute minimum temperature (°C)-6.2-11.2-7.2-1.32.510.215.112.79.41.2-6.4-4.4

Allegheny County monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.710.711.913.314.415.014.713.712.511.110.09.3
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)2.96.86.28.610.410.811.110.78.86.16.73.9
Precipitation (mm)1176110665821291209250964375
Sunny days714131420115712151812
Rainy days201316161119262418161018
Snow days412000000021

Allegheny County - weather forecast by months

Allegheny County weather in januaryAllegheny County weather in februaryAllegheny County weather in marchAllegheny County weather in aprilAllegheny County weather in mayAllegheny County weather in juneAllegheny County weather in julyAllegheny County weather in augustAllegheny County weather in septemberAllegheny County weather in octoberAllegheny County weather in novemberAllegheny County weather in december

Best time to visit Allegheny County:

The best time to visit Allegheny County during the most sunny months:

  • May — 10.4(h)
  • June — 10.8(h)
  • July — 11.1(h)
  • August — 10.7(h)

The largest precipitation sum in Allegheny County is at

  • January — 117(mm)
  • June — 129(mm)
  • July — 120(mm)

    • Weather forecast in the closest to Allegheny County admin centers

    Weather forecast in the closest towns to Allegheny County

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    See also
    MapTrains schedule
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    Frequently asked questions

    When is the best time to visit Allegheny County?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Allegheny County.
    What is the weather like in Allegheny County?
    See average temperature, rainfall and daylight hours for Allegheny County by month in the table above.
    How many sunny days does Allegheny County have?
    The monthly weather statistics above show sunshine and rainfall patterns for Allegheny County throughout the year.