Seattle, WA vs Chicago, IL

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

Seattle is warmer than Chicago (53.8°F vs 50.8°F annual avg) and wetter than it (36.5 in vs 0 in per year). Seattle has a Warm-summer Mediterranean climate; Chicago a Desert (cold) climate.

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

Chicago, IL

Annual avg
50.8°F
Annual precip
0 in
Warmest month
July (81.0°F)
Coldest month
January (20.1°F)
Annual swing
48.1°F
Pleasant months
4 / 12
Desert (cold) BWk USDA Zone 7b

Best months to visit each city

Seattle

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

Chicago

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

Month-by-month comparison

Month Seattle Chicago
High Low Precip High Low Precip
January 48.6°F 36.8°F 5.21 in 31.9°F 20.1°F — in
February 50.7°F 36.8°F 3.71 in 35.7°F 23.1°F — in
March 54.8°F 39.4°F 3.94 in 44.9°F 30.9°F — in
April 59.8°F 43.6°F 2.89 in 55.2°F 40.4°F — in
May 66.5°F 49.3°F 1.98 in 65.7°F 50.1°F — in
June 71.2°F 54.0°F 1.22 in 75.8°F 60.0°F — in
July 77.3°F 57.5°F 0.56 in 81.0°F 67.3°F — in
August 77.4°F 58.1°F 0.83 in 80.0°F 67.4°F — in
September 71.7°F 53.9°F 1.37 in 73.2°F 60.2°F — in
October 61.0°F 46.4°F 3.49 in 60.9°F 47.7°F — in
November 53.0°F 39.9°F 5.80 in 48.5°F 36.4°F — in
December 47.8°F 36.2°F 5.49 in 36.6°F 25.2°F — in
Seattle overview
Full climate profile
 Chicago overview
Full climate profile