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Norristown, PA weather and climate

Montgomery County, PA · population 35,782 · about 141 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Norristown's own coordinates.

The year at a glance

Sunny days
203
clear or partly cloudy, per year
Precipitation
43 in
per year
Wet days
120
rain or snow per year
Snowfall
25 in
per year
Hot days
38
above 90 °F
Freezing nights
107
at or below 32 °F
Humidity
69%
average relative
Average temperature
55 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
20406080JanMarMayJulSepNovDaily high, Jan: 42 °FDaily high, Feb: 44 °FDaily high, Mar: 52 °FDaily high, Apr: 65 °FDaily high, May: 75 °FDaily high, Jun: 84 °FDaily high, Jul: 89 °FDaily high, Aug: 87 °FDaily high, Sep: 80 °FDaily high, Oct: 68 °FDaily high, Nov: 57 °FDaily high, Dec: 46 °FDaily low, Jan: 23 °FDaily low, Feb: 25 °FDaily low, Mar: 32 °FDaily low, Apr: 42 °FDaily low, May: 52 °FDaily low, Jun: 62 °FDaily low, Jul: 67 °FDaily low, Aug: 65 °FDaily low, Sep: 58 °FDaily low, Oct: 45 °FDaily low, Nov: 35 °FDaily low, Dec: 28 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high424452657584898780685746
Daily low232532425262676558453528

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovNorristown, Jan: 3.2 inNorristown, Feb: 3.0 inNorristown, Mar: 4.1 inNorristown, Apr: 3.6 inNorristown, May: 3.5 inNorristown, Jun: 3.8 inNorristown, Jul: 3.9 inNorristown, Aug: 3.7 inNorristown, Sep: 4.1 inNorristown, Oct: 3.6 inNorristown, Nov: 2.9 inNorristown, Dec: 4.0 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Norristown3.23.04.13.63.53.83.93.74.13.62.94.0

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovNorristown, Jan: 16 daysNorristown, Feb: 16 daysNorristown, Mar: 16 daysNorristown, Apr: 15 daysNorristown, May: 16 daysNorristown, Jun: 16 daysNorristown, Jul: 18 daysNorristown, Aug: 19 daysNorristown, Sep: 18 daysNorristown, Oct: 19 daysNorristown, Nov: 17 daysNorristown, Dec: 16 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Norristown161616151616181918191716

Compare Norristown with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Pennsylvania city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).