Thomson, IL vs Seattle, WA

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

Thomson is cooler than Seattle (49.9°F vs 53.8°F annual avg) and similar rainfall to it (34.3 in vs 36.5 in per year). Thomson has a Hot-summer humid continental climate; Seattle a Warm-summer Mediterranean climate.

Thomson, IL

Annual avg
49.9°F
Annual precip
34.3 in
Warmest month
July (84.0°F)
Coldest month
January (13.6°F)
Annual swing
53.2°F
Pleasant months
2 / 12
Hot-summer humid continental Dfa USDA Zone 6b

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

Thomson

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 Thomson Seattle
High Low Precip High Low Precip
January 29.3°F 13.6°F 1.40 in 48.6°F 36.8°F 5.21 in
February 33.8°F 17.1°F 1.56 in 50.7°F 36.8°F 3.71 in
March 45.7°F 28.2°F 2.41 in 54.8°F 39.4°F 3.94 in
April 59.4°F 39.8°F 3.39 in 59.8°F 43.6°F 2.89 in
May 71.1°F 51.4°F 4.03 in 66.5°F 49.3°F 1.98 in
June 80.7°F 61.7°F 4.52 in 71.2°F 54.0°F 1.22 in
July 84.0°F 65.2°F 3.40 in 77.3°F 57.5°F 0.56 in
August 82.1°F 63.2°F 3.43 in 77.4°F 58.1°F 0.83 in
September 75.9°F 55.2°F 3.66 in 71.7°F 53.9°F 1.37 in
October 63.0°F 43.4°F 2.58 in 61.0°F 46.4°F 3.49 in
November 47.6°F 31.4°F 2.20 in 53.0°F 39.9°F 5.80 in
December 34.8°F 20.5°F 1.69 in 47.8°F 36.2°F 5.49 in
Thomson overview
Full climate profile
 Seattle overview
Full climate profile