Washington climate: monthly averages: annual mean temperature 13.2 C; warmest month Jul (25.8 C); coldest month Jan (0.1 C).
Annual mean temperature: 13.2 C
Warmest month: Jul (25.8 C)
Coldest month: Jan (0.1 C)
Wettest month: Jun (3.94 mm/day)
All-time record high: 40.2 C
All-time record low: -18.7 C
Washington’s climate averages a yearly mean temperature of **13.2°C**, with July as the warmest month (25.8°C) and January the coldest (0.1°C). Annual rainfall totals about **1,153 mm**, peaking in June (3.94 mm/day). Extreme temperatures range from a record high of **40.2°C** to a low of **-18.7°C**. The wettest month is June, with an average of **3.94 mm/day**. Washington receives roughly **1,153 mm of rain annually**, or about **3.16 mm/day** on average.
Annual mean temperature 13.2 C
Warmest month Jul (25.8 C)
Coldest month Jan (0.1 C)
Wettest month Jun (3.94 mm/day)
All-time record high 40.2 C
All-time record low -18.7 C
Annual precipitation 1,153 mm / year
Coordinates 38.89511, -77.03637
Population 689,545
Average monthly temperature and rainfall in Washington
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
0.1
2.16
20.6
-16.5
Feb
1.3
2.49
23.4
-18.7
Mar
5.8
2.70
25.1
-16.8
Apr
12.2
3.07
33.0
-3.8
May
17.6
3.53
32.9
0.4
Jun
22.8
3.94
36.3
7.7
Jul
25.8
3.75
40.2
12.6
Aug
25.1
3.53
37.8
13.2
Sep
21.3
3.57
36.2
6.6
Oct
14.4
3.38
35.6
-1.1
Nov
7.8
2.67
25.3
-5.7
Dec
2.8
3.06
22.4
-11.2
What the Washington climate table shows
Values are multi-decadal climatological averages for the 38.89511, -77.03637 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.