Washington DC Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Washington DC during each month of the year.

The average high and low temperatures are listed below monthly and annually for Washington, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 70, 80 or 90 °F each month in the capital city, scroll down farther. There are also monthly and yearly counts of days with cold weather.

All the numbers are long-term historical averages based on climate data gathered from 1981 to 2010 at the Ronald Reagan Washington National Airport in Arlington, Virginia.

Average Washington temperatures
High °F Low °F   High °C Low °C
43 29 January 6 -2
47 31 February 8 -1
56 38 March 13 3
67 47 April 19 8
75 57 May 24 14
84 66 June 29 19
88 71 July 31 22
87 70 August 30 21
80 62 September 26 17
68 51 October 20 10
58 41 November 14 5
47 33 December 8 0
67 50 Year 19 10

Days of Hot Weather in Washington DC

On the hottest days in Washington DC, the thermometer reaches into the 90s Fahrenheit. Hot weather generally shows up periodically from May to September. Some years even get a 90-plus degrees day in April or October.

Temperatures sometimes climb to 100 degrees or more, but that's not a yearly event. A day with 100-degree heat can happen in July or August.

Days per month in Washington of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 1 0 0
March 1 1 0
April 11 3 0
May 23 10 1
June 29 23 6
July 31 29 12
August 31 27 8
September 27 14 2
October 13 3 0
November 3 0 0
December 1 0 0
Year 172 110 31

How Often Washington Has Cold Temperatures

Freezing night-time temperatures can arrive anytime in Washington from November to April. Normally the thermometer doesn't get above 32 °F on eight days a year. Crisp days can occur during December, January or February, and even in March.

The coldest nights in the capital drop down to 0 degrees F (-18 °C). A night that chilly is rare though, happening only about once a decade, typically in January. Even lows in the 10 to 19 degree range are uncommon here, occurring on average just once a year.

Days per month on average in Washington when the minimum temperature drops to 20, 32, or 40 °F or below
  20 °F
-8 °C
32 °F
0 °C
40 °F
4 °C
January 6 19 28
February 2 16 25
March 0 7 19
April 0 1 5
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 2
November 0 4 14
December 2 15 26
Year 10 61 120
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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