Rock Island, WA vs Phoenix, AZ

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

Rock Island is cooler than Phoenix (51.2°F vs 72.5°F annual avg) and similar rainfall to it (7.8 in vs 8.9 in per year). Rock Island has a Desert (cold) climate; Phoenix a Desert (hot) climate.

Rock Island, WA

Annual avg
51.2°F
Annual precip
7.8 in
Warmest month
July (87.6°F)
Coldest month
January (24.1°F)
Annual swing
45.8°F
Pleasant months
2 / 12
Desert (cold) BWk USDA Zone 7b

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 Island

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 Island Phoenix
High Low Precip High Low Precip
January 33.6°F 24.1°F 1.02 in 65.4°F 44.1°F 1.17 in
February 41.6°F 27.4°F 0.76 in 68.1°F 46.1°F 1.21 in
March 52.5°F 33.7°F 0.73 in 75.0°F 50.9°F 1.09 in
April 61.8°F 40.4°F 0.57 in 82.5°F 56.6°F 0.35 in
May 71.6°F 48.7°F 0.77 in 91.5°F 64.7°F 0.19 in
June 78.2°F 54.9°F 0.50 in 101.5°F 72.7°F 0.03 in
July 87.6°F 61.8°F 0.24 in 104.0°F 80.8°F 0.81 in
August 86.4°F 61.0°F 0.23 in 102.5°F 80.5°F 0.96 in
September 76.7°F 52.5°F 0.23 in 97.5°F 74.7°F 0.71 in
October 60.5°F 40.9°F 0.62 in 86.3°F 62.7°F 0.67 in
November 43.8°F 30.9°F 0.85 in 74.0°F 50.8°F 0.90 in
December 33.4°F 24.5°F 1.31 in 63.9°F 42.7°F 0.81 in
Rock Island overview
Full climate profile
 Phoenix overview
Full climate profile