Norristown (PA) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Norristown

Norristown average temperature chart (Celsius) Norristown average temperature chart (Fahrenheit)
Average monthly temperatures in Norristown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 3 4.8 10.5 16.7 22.5 27.3 29.6 28.7 25 18.7 12.5 5.9
°F 37.5 40.7 51 62 72.5 81.2 85.3 83.7 76.9 65.6 54.5 42.7

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Norristown monthly rainfall chart (mm) Norristown monthly rainfall chart (inches)
Average monthly rainfall in Norristown (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 87 75 95 97 109 99 113 104 98 77 97 93
inches 3.4 2.9 3.7 3.8 4.3 3.9 4.4 4.1 3.9 3 3.8 3.6
Rainy days 11 10 10 11 12 10 10 9 8 8 10 11

Average annual rainfall in Norristown: 1107.466mm (436 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Norristown

Norristown average daily sunshine chart
Average daily sunshine Norristown
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.5 6.1 7 7.8 8.5 9.6 9.6 9 7.8 7 5.4 4.8

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Norristown average minimum / maximum temperatures (Celsius) Norristown average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Norristown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -5.9 -4.7 -0.2 4.9 10.6 15.8 18.5 17.8 13.6 6.9 2.5 -3
Max °C 3.3 5.1 10.8 17 22.8 27.6 29.9 29 25.3 19 12.8 6.2
Min °F 21.5 23.6 31.6 40.7 51.1 60.4 65.3 64 56.4 44.3 36.4 26.7
Max °F 29.7 32.4 41.5 51.6 62.1 71.1 75.6 74.1 66.9 55.2 45.7 34.9

Sea temperature

The graph below shows the average sea temperature.

Norristown average sea temperature chart (Celsius) Norristown average sea temperature chart (Fahrenheit)
Average sea temperature around Norristown in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 3.2 1.3 1.8 4.8 9.9 16.3 21.8 23.2 21 16.4 11.2 6.7
°F 37.8 34.3 35.2 40.7 49.8 61.4 71.2 73.8 69.9 61.5 52.2 44

Wind speed

The graph below shows the average wind speed.

Norristown average winspeed by month (km/h) Norristown average winspeed by month (mph)
Average wind speed in Norristown (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 17 18 19 18 16 14 13 13 14 14 17 17
mph 11 11 12 11 10 9 8 8 9 9 10 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Norristown relative humidity averages
Average relative humidity in Norristown
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
67% 65% 62% 61% 66% 68% 70% 71% 73% 71% 69% 69%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Norristown weather stats

Norristown weather statistics
Hottest month: July 29.6°C 85.3°F
Driest month: February 75mm 3ins
Sunniest month: July 9.6hrs
Coldest month: January 3°C 37.4°F
Wettest month: July 113mm 4.4ins
Warmest sea: August 23.2°C 73.8°F
Map showing location of Norristown (40.1215, -75.3399) Norristown map pin © Google

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