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.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather recorded at the Ronald Reagan Washington National Airport in Arlington, Virginia.

10-year temperature averages for Washington DC, 2010 to 2019
High °F Low °F   High °C Low °C
44 29 January 7 -1
48 32 February 9 0
57 39 March 14 4
69 49 April 21 10
78 60 May 25 16
86 69 June 30 20
91 74 July 33 23
88 71 August 31 22
82 66 September 28 19
70 54 October 21 12
58 41 November 14 5
50 36 December 10 2
68 52 Year 20 11
30-year temperature averages for Washington DC, 1981 to 2010
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
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information. 1981-2010 U.S. Climate Normals. (Data Access. FTP.)

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