Weather in Ontario County in May

General weather information about Ontario County

Average annual temperature is 10.5 °C

Absolute maximum temperature: 32.6 °C

Absolute minimum temperature: -25.4 °C

Number of sunny days: 121 days

Number of rainy days: 215 days

Number of snow days: 29 days

Look at detailed online map of Ontario County

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

Ontario County air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)11.917.615.128.831.332.232.629.632.429.415.713.6
Average daytime temperature (°C)3.76.05.816.520.124.127.924.823.216.68.36.8
Average temperature (°C)0.5-0.11.29.913.518.722.620.017.912.74.43.6
Average night temperature (°C)-1.9-4.8-2.44.88.014.218.416.514.39.81.21.1
Absolute minimum temperature (°C)-8.9-25.4-12.6-4.91.99.414.911.610.00.7-5.1-5.7

Ontario County monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.410.511.913.414.615.315.013.912.511.09.89.1
Daylight minimum duration (h)9.09.011.012.014.015.014.013.011.010.09.09.0
Sunshine mean duration (h)2.45.25.48.311.410.711.410.18.85.05.02.8
Precipitation (mm)116689797508913713728706791
Sunny days6981122116715998
Rainy days17101618919252415221921
Snow days897100000022

Ontario County - weather forecast by months

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Best time to visit Ontario County:

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

  • May — 11.4(h)
  • June — 10.7(h)
  • July — 11.4(h)
  • August — 10.1(h)

Months with the longest average daylight duration in Ontario County:

  • June — 15.3(h)

The largest precipitation sum in Ontario County is at

  • January — 116(mm)
  • July — 137(mm)
  • August — 137(mm)

    • Weather forecast in the closest to Ontario County admin centers

    Weather forecast in the closest towns to Ontario County

    Explore Ontario County

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    MapTrains schedule
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    Frequently asked questions

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