Chinook, MT vs Seattle, WA

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

Chinook is cooler than Seattle (42.4°F vs 53.8°F annual avg) and drier than it (13.4 in vs 36.5 in per year). Chinook has a Semi-arid (cold) climate; Seattle a Warm-summer Mediterranean climate.

Chinook, MT

Annual avg
42.4°F
Annual precip
13.4 in
Warmest month
July (84.3°F)
Coldest month
January (4.2°F)
Annual swing
53.3°F
Semi-arid (cold) BSk USDA Zone 5b

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

Chinook

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 Chinook Seattle
High Low Precip High Low Precip
January 27.1°F 4.2°F 0.45 in 48.6°F 36.8°F 5.21 in
February 31.4°F 6.9°F 0.37 in 50.7°F 36.8°F 3.71 in
March 43.0°F 17.7°F 0.59 in 54.8°F 39.4°F 3.94 in
April 56.9°F 29.4°F 1.04 in 59.8°F 43.6°F 2.89 in
May 67.0°F 40.0°F 2.42 in 66.5°F 49.3°F 1.98 in
June 75.4°F 49.3°F 2.86 in 71.2°F 54.0°F 1.22 in
July 84.3°F 53.6°F 1.62 in 77.3°F 57.5°F 0.56 in
August 83.3°F 51.7°F 1.14 in 77.4°F 58.1°F 0.83 in
September 72.3°F 41.2°F 0.99 in 71.7°F 53.9°F 1.37 in
October 56.9°F 28.5°F 0.88 in 61.0°F 46.4°F 3.49 in
November 41.3°F 17.0°F 0.69 in 53.0°F 39.9°F 5.80 in
December 30.5°F 7.5°F 0.39 in 47.8°F 36.2°F 5.49 in
Chinook overview
Full climate profile
 Seattle overview
Full climate profile