Rock Island, WA vs Denver, CO

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

Rock Island is about the same temperature as Denver (51.2°F vs 51.4°F annual avg) and drier than it (7.8 in vs 15.4 in per year). Rock Island has a Desert (cold) climate; Denver a Semi-arid (cold) 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

Denver, CO

Annual avg
51.4°F
Annual precip
15.4 in
Warmest month
July (90.2°F)
Coldest month
January (17.6°F)
Annual swing
43°F
Semi-arid (cold) BSk USDA Zone 7a

Best months to visit each city

Rock Island

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

Denver

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

Month-by-month comparison

Month Rock Island Denver
High Low Precip High Low Precip
January 33.6°F 24.1°F 1.02 in 46.5°F 17.6°F 0.46 in
February 41.6°F 27.4°F 0.76 in 47.5°F 19.3°F 0.53 in
March 52.5°F 33.7°F 0.73 in 56.4°F 27.1°F 1.12 in
April 61.8°F 40.4°F 0.57 in 62.5°F 33.7°F 1.67 in
May 71.6°F 48.7°F 0.77 in 71.7°F 43.4°F 2.29 in
June 78.2°F 54.9°F 0.50 in 84.1°F 52.9°F 1.68 in
July 87.6°F 61.8°F 0.24 in 90.2°F 59.3°F 2.12 in
August 86.4°F 61.0°F 0.23 in 87.9°F 57.2°F 1.83 in
September 76.7°F 52.5°F 0.23 in 80.1°F 48.2°F 1.51 in
October 60.5°F 40.9°F 0.62 in 66.7°F 35.7°F 0.98 in
November 43.8°F 30.9°F 0.85 in 54.8°F 25.5°F 0.70 in
December 33.4°F 24.5°F 1.31 in 45.9°F 17.7°F 0.47 in
Rock Island overview
Full climate profile
 Denver overview
Full climate profile