Flat Rock, IL vs Seattle, WA

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

Flat Rock is about the same temperature as Seattle (55.1°F vs 53.8°F annual avg) and wetter than it (46.3 in vs 36.5 in per year). Flat Rock has a Hot-summer humid continental climate; Seattle a Warm-summer Mediterranean climate.

Flat Rock, IL

Annual avg
55.1°F
Annual precip
46.3 in
Warmest month
July (86.5°F)
Coldest month
January (22.8°F)
Annual swing
45.8°F
Pleasant months
1 / 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

Flat Rock

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 Flat Rock Seattle
High Low Precip High Low Precip
January 38.4°F 22.8°F 3.48 in 48.6°F 36.8°F 5.21 in
February 43.5°F 26.4°F 2.63 in 50.7°F 36.8°F 3.71 in
March 54.4°F 34.7°F 3.58 in 54.8°F 39.4°F 3.94 in
April 66.6°F 44.5°F 5.06 in 59.8°F 43.6°F 2.89 in
May 76.1°F 55.4°F 4.91 in 66.5°F 49.3°F 1.98 in
June 84.1°F 63.4°F 4.88 in 71.2°F 54.0°F 1.22 in
July 86.5°F 66.3°F 4.23 in 77.3°F 57.5°F 0.56 in
August 85.7°F 64.0°F 3.53 in 77.4°F 58.1°F 0.83 in
September 80.4°F 56.2°F 3.58 in 71.7°F 53.9°F 1.37 in
October 68.4°F 45.6°F 3.73 in 61.0°F 46.4°F 3.49 in
November 53.6°F 34.8°F 3.63 in 53.0°F 39.9°F 5.80 in
December 42.1°F 27.5°F 3.06 in 47.8°F 36.2°F 5.49 in
Flat Rock overview
Full climate profile
 Seattle overview
Full climate profile