Vandalia, IL vs Seattle, WA

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

Vandalia is about the same temperature as Seattle (54.2°F vs 53.8°F annual avg) and wetter than it (43.7 in vs 36.5 in per year). Vandalia has a Hot-summer humid continental climate; Seattle a Warm-summer Mediterranean climate.

Vandalia, IL

Annual avg
54.2°F
Annual precip
43.7 in
Warmest month
July (86.8°F)
Coldest month
January (20.7°F)
Annual swing
47.9°F
Pleasant months
2 / 12
Hot-summer humid continental Dfa 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

Vandalia

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 Vandalia Seattle
High Low Precip High Low Precip
January 36.9°F 20.7°F 2.97 in 48.6°F 36.8°F 5.21 in
February 41.9°F 24.2°F 2.49 in 50.7°F 36.8°F 3.71 in
March 52.7°F 33.2°F 3.32 in 54.8°F 39.4°F 3.94 in
April 65.1°F 43.3°F 4.86 in 59.8°F 43.6°F 2.89 in
May 74.9°F 54.2°F 5.30 in 66.5°F 49.3°F 1.98 in
June 83.7°F 63.2°F 4.87 in 71.2°F 54.0°F 1.22 in
July 86.8°F 66.6°F 3.90 in 77.3°F 57.5°F 0.56 in
August 85.9°F 64.4°F 3.24 in 77.4°F 58.1°F 0.83 in
September 79.6°F 55.8°F 3.07 in 71.7°F 53.9°F 1.37 in
October 67.7°F 44.0°F 3.26 in 61.0°F 46.4°F 3.49 in
November 53.7°F 34.1°F 3.76 in 53.0°F 39.9°F 5.80 in
December 41.5°F 25.6°F 2.69 in 47.8°F 36.2°F 5.49 in
Vandalia overview
Full climate profile
 Seattle overview
Full climate profile