Coulee Dam, WA vs Seattle, WA

Side-by-side comparison of monthly climate normals (NOAA 1991-2020).

Coulee Dam is cooler than Seattle (49.9°F vs 53.8°F annual avg) and drier than it (11.1 in vs 36.5 in per year). Coulee Dam has a Semi-arid (cold) climate; Seattle a Warm-summer Mediterranean climate.

Coulee Dam, WA

Annual avg
49.9°F
Annual precip
11.1 in
Warmest month
July (87.6°F)
Coldest month
January (23.3°F)
Annual swing
45.5°F
Pleasant months
2 / 12
Semi-arid (cold) BSk USDA Zone 7b

Seattle, WA

Annual avg
53.8°F
Annual precip
36.5 in
Warmest month
August (77.4°F)
Coldest month
December (36.2°F)
Annual swing
25.8°F
Pleasant months
4 / 12
Warm-summer Mediterranean Csb USDA Zone 9a

Best months to visit each city

Coulee Dam

J
F
M
A
M
J
J
A
S
O
N
D

Seattle

J
F
M
A
M
J
J
A
S
O
N
D

Month-by-month comparison

Month Coulee Dam Seattle
High Low Precip High Low Precip
January 32.7°F 23.3°F 1.15 in 48.6°F 36.8°F 5.21 in
February 39.5°F 25.3°F 0.88 in 50.7°F 36.8°F 3.71 in
March 50.7°F 31.5°F 1.07 in 54.8°F 39.4°F 3.94 in
April 60.6°F 37.7°F 0.97 in 59.8°F 43.6°F 2.89 in
May 70.8°F 45.8°F 1.11 in 66.5°F 49.3°F 1.98 in
June 77.8°F 52.0°F 1.15 in 71.2°F 54.0°F 1.22 in
July 87.6°F 59.4°F 0.49 in 77.3°F 57.5°F 0.56 in
August 86.9°F 58.3°F 0.33 in 77.4°F 58.1°F 0.83 in
September 76.8°F 50.5°F 0.36 in 71.7°F 53.9°F 1.37 in
October 60.2°F 40.1°F 0.94 in 61.0°F 46.4°F 3.49 in
November 43.0°F 30.9°F 1.20 in 53.0°F 39.9°F 5.80 in
December 33.1°F 23.9°F 1.42 in 47.8°F 36.2°F 5.49 in
Coulee Dam overview
Full climate profile
 Seattle overview
Full climate profile