Rock Springs, WY vs Seattle, WA

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

Rock Springs is cooler than Seattle (45°F vs 53.8°F annual avg) and drier than it (10.4 in vs 36.5 in per year). Rock Springs has a Semi-arid (cold) climate; Seattle a Warm-summer Mediterranean climate.

Rock Springs, WY

Annual avg
45°F
Annual precip
10.4 in
Warmest month
July (86.3°F)
Coldest month
January (12.4°F)
Annual swing
46.6°F
Semi-arid (cold) BSk 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

Rock Springs

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 Rock Springs Seattle
High Low Precip High Low Precip
January 34.6°F 12.4°F 0.45 in 48.6°F 36.8°F 5.21 in
February 37.9°F 15.1°F 0.43 in 50.7°F 36.8°F 3.71 in
March 48.6°F 23.4°F 0.61 in 54.8°F 39.4°F 3.94 in
April 56.8°F 29.5°F 1.07 in 59.8°F 43.6°F 2.89 in
May 67.3°F 37.4°F 1.88 in 66.5°F 49.3°F 1.98 in
June 78.6°F 45.2°F 0.82 in 71.2°F 54.0°F 1.22 in
July 86.3°F 52.5°F 0.92 in 77.3°F 57.5°F 0.56 in
August 84.4°F 50.7°F 0.89 in 77.4°F 58.1°F 0.83 in
September 75.0°F 41.2°F 1.17 in 71.7°F 53.9°F 1.37 in
October 61.3°F 31.4°F 1.03 in 61.0°F 46.4°F 3.49 in
November 44.7°F 20.7°F 0.66 in 53.0°F 39.9°F 5.80 in
December 33.2°F 12.4°F 0.52 in 47.8°F 36.2°F 5.49 in
Rock Springs overview
Full climate profile
 Seattle overview
Full climate profile