Best year time to visit Norristown

General weather information about Norristown

Average annual temperature is 13.6 °C

Absolute maximum temperature: 36.4 °C

Absolute minimum temperature: -10.9 °C

Number of sunny days: 184

Number of rainy days: 177

Number of snow days: 4

Average annual precipitation: 1200 mm

Look at detailed online map of Norristown

* Weather data for Norristown United States is based on climate observations for 2023 year

Norristown air temperature forecast for each month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Absolute maximum temperature (°C) 18.6 19.2 19.1 30.6 30.8 36.2 34.8 32.4 36.4 28.4 21.7 17.6
Average daytime temperature (°C) 9.3 10.1 11.5 20.4 23.6 27.7 31.3 29.1 25.6 20.5 12.2 9.7
Average temperature (°C) 5.2 4.7 5.7 13.8 16.4 21 25 23.6 20.2 14.8 6.8 5.3
Average night temperature (°C) 1.9 0.3 0.7 8.4 9.7 15.1 20.3 19.1 15.9 10.3 2.5 1.8
Absolute minimum temperature (°C) -4.6 -10.9 -4.8 0.4 3.7 10 16.5 14.6 10.7 4 -4.8 -4.1

Norristown monthly weather indicators

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daylight maximum duration (h) 10.1 11.3 12.6 13.9 14.8 15 15 14.3 13.1 11.8 10.5 9.5
Daylight mean duration (h) 9.7 10.7 12 13.3 14.4 15 14.7 13.7 12.5 11.2 10 9.4
Daylight minimum duration (h) 9.4 10.2 11.3 12.7 13.9 14.8 14.3 13.1 11.8 10.5 9.6 9.3
Sunshine mean duration (h) 5.5 6.8 7.9 10.1 11.5 10.7 11.5 10.2 8.8 8.4 8 5.8
Precipitation (mm) 114 49 98 123 38 115 128 62 184 46 68 176
Sunny days 13 17 12 16 20 14 7 14 13 21 21 16
Rainy days 18 9 18 14 11 16 24 17 17 10 8 15

Norristown - weather forecast by months

January February March April May June July August September October November December

Best time to visit Norristown:

The best time to visit Norristown during the most sunny months:

  • May — 11.5(h)
  • July — 11.5(h)

The largest precipitation sum in Norristown is at

  • July — 128(mm)
  • September — 184(mm)
  • December — 176(mm)

Weather forecast in the closest to Norristown admin centers