Rock Springs, WY vs Phoenix, AZ

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

Rock Springs is cooler than Phoenix (45°F vs 72.5°F annual avg) and similar rainfall to it (10.4 in vs 8.9 in per year). Rock Springs has a Semi-arid (cold) climate; Phoenix a Desert (hot) 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

Phoenix, AZ

Annual avg
72.5°F
Annual precip
8.9 in
Warmest month
July (104.0°F)
Coldest month
December (42.7°F)
Annual swing
39.1°F
Pleasant months
2 / 12
Desert (hot) BWh USDA Zone 9b

Best months to visit each city

Rock Springs

J
F
M
A
M
J
J
A
S
O
N
D

Phoenix

J
F
M
A
M
J
J
A
S
O
N
D

Month-by-month comparison

Month Rock Springs Phoenix
High Low Precip High Low Precip
January 34.6°F 12.4°F 0.45 in 65.4°F 44.1°F 1.17 in
February 37.9°F 15.1°F 0.43 in 68.1°F 46.1°F 1.21 in
March 48.6°F 23.4°F 0.61 in 75.0°F 50.9°F 1.09 in
April 56.8°F 29.5°F 1.07 in 82.5°F 56.6°F 0.35 in
May 67.3°F 37.4°F 1.88 in 91.5°F 64.7°F 0.19 in
June 78.6°F 45.2°F 0.82 in 101.5°F 72.7°F 0.03 in
July 86.3°F 52.5°F 0.92 in 104.0°F 80.8°F 0.81 in
August 84.4°F 50.7°F 0.89 in 102.5°F 80.5°F 0.96 in
September 75.0°F 41.2°F 1.17 in 97.5°F 74.7°F 0.71 in
October 61.3°F 31.4°F 1.03 in 86.3°F 62.7°F 0.67 in
November 44.7°F 20.7°F 0.66 in 74.0°F 50.8°F 0.90 in
December 33.2°F 12.4°F 0.52 in 63.9°F 42.7°F 0.81 in
Rock Springs overview
Full climate profile
 Phoenix overview
Full climate profile