Potomac (MD) monthly weather averages

Contents

Average daytime temperature

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

Potomac average temperature chart (Celsius) Potomac average temperature chart (Fahrenheit)
Average monthly temperatures in Potomac (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 4.3 6.2 12.2 18 23.4 28 30.4 29.5 25.8 19.6 13.3 7
°F 39.8 43.2 54 64.4 74.1 82.3 86.7 85.1 78.4 67.3 56 44.5

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.

Potomac monthly rainfall chart (mm) Potomac monthly rainfall chart (inches)
Average monthly rainfall in Potomac (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 72 70 87 81 103 92 94 98 91 81 87 84
inches 2.8 2.7 3.4 3.2 4.1 3.6 3.7 3.9 3.6 3.2 3.4 3.3
Rainy days 10 10 10 10 12 10 10 10 8 8 9 10

Average annual rainfall in Potomac: 999.433mm (393.5 inches)

Average daily sunshine

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

Potomac average daily sunshine chart
Average daily sunshine Potomac
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.2 5.9 7.1 8.1 8.9 10 9.7 9.1 7.9 7 5.4 4.7

Day / night temperatures

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

Potomac average minimum / maximum temperatures (Celsius) Potomac average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Potomac (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -5.4 -4.1 0.7 5.5 11.1 16 18.8 18 14 7.1 2.4 -2.6
Max °C 4.6 6.5 12.5 18.3 23.7 28.3 30.7 29.8 26.1 19.9 13.6 7.2
Min °F 22.4 24.6 33.3 41.9 52 60.7 65.8 64.4 57.1 44.8 36.3 27.3
Max °F 31.3 34.2 43.9 53.4 63.3 71.8 76.5 75 68 56.3 46.4 36.1

Sea temperature

The graph below shows the average sea temperature.

Potomac average sea temperature chart (Celsius) Potomac average sea temperature chart (Fahrenheit)
Average sea temperature around Potomac in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 2.7 1 1.6 5 10.3 17 22.3 23.6 21.4 16.6 11.2 6.3
°F 36.8 33.8 35 41 50.5 62.6 72.2 74.6 70.6 61.8 52.2 43.4

Wind speed

The graph below shows the average wind speed.

Potomac average winspeed by month (km/h) Potomac average winspeed by month (mph)
Average wind speed in Potomac (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 16 16 17 16 14 13 12 12 12 13 15 15
mph 10 10 11 10 9 8 7 7 7 8 9 9

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.

Potomac relative humidity averages
Average relative humidity in Potomac
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
65% 64% 62% 61% 68% 69% 71% 73% 73% 71% 68% 68%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Potomac weather stats

Potomac weather statistics
Hottest month: July 30.4°C 86.7°F
Driest month: February 70mm 2.8ins
Sunniest month: June 10hrs
Coldest month: January 4.3°C 39.7°F
Wettest month: May 103mm 4.1ins
Warmest sea: August 23.6°C 74.5°F
Map showing location of Potomac (39.01817, -77.20859) Potomac map pin © Google

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