Decatur, IA vs Seattle, WA

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

Decatur is cooler than Seattle (51.6°F vs 53.8°F annual avg) and similar rainfall to it (37.4 in vs 36.5 in per year). Decatur has a Hot-summer humid continental climate; Seattle a Warm-summer Mediterranean climate.

Decatur, IA

Annual avg
51.6°F
Annual precip
37.4 in
Warmest month
July (85.4°F)
Coldest month
January (15.6°F)
Annual swing
51.5°F
Pleasant months
2 / 12
Hot-summer humid continental Dfa USDA Zone 7a

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

Decatur

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 Decatur Seattle
High Low Precip High Low Precip
January 33.1°F 15.6°F 1.04 in 48.6°F 36.8°F 5.21 in
February 38.1°F 19.6°F 1.35 in 50.7°F 36.8°F 3.71 in
March 50.8°F 30.7°F 2.20 in 54.8°F 39.4°F 3.94 in
April 62.5°F 41.4°F 4.25 in 59.8°F 43.6°F 2.89 in
May 72.0°F 52.5°F 5.14 in 66.5°F 49.3°F 1.98 in
June 81.5°F 62.2°F 4.81 in 71.2°F 54.0°F 1.22 in
July 85.4°F 66.2°F 4.11 in 77.3°F 57.5°F 0.56 in
August 83.8°F 63.9°F 4.38 in 77.4°F 58.1°F 0.83 in
September 76.5°F 55.2°F 3.71 in 71.7°F 53.9°F 1.37 in
October 64.0°F 43.3°F 2.82 in 61.0°F 46.4°F 3.49 in
November 49.7°F 31.1°F 2.09 in 53.0°F 39.9°F 5.80 in
December 37.7°F 20.9°F 1.48 in 47.8°F 36.2°F 5.49 in
Decatur overview
Full climate profile
 Seattle overview
Full climate profile