Coulee Dam, WA vs Phoenix, AZ

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

Coulee Dam is cooler than Phoenix (49.9°F vs 72.5°F annual avg) and similar rainfall to it (11.1 in vs 8.9 in per year). Coulee Dam has a Semi-arid (cold) climate; Phoenix a Desert (hot) climate.

Coulee Dam, WA

Annual avg
49.9°F
Annual precip
11.1 in
Warmest month
July (87.6°F)
Coldest month
January (23.3°F)
Annual swing
45.5°F
Pleasant months
2 / 12
Semi-arid (cold) BSk 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

Coulee Dam

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 Coulee Dam Phoenix
High Low Precip High Low Precip
January 32.7°F 23.3°F 1.15 in 65.4°F 44.1°F 1.17 in
February 39.5°F 25.3°F 0.88 in 68.1°F 46.1°F 1.21 in
March 50.7°F 31.5°F 1.07 in 75.0°F 50.9°F 1.09 in
April 60.6°F 37.7°F 0.97 in 82.5°F 56.6°F 0.35 in
May 70.8°F 45.8°F 1.11 in 91.5°F 64.7°F 0.19 in
June 77.8°F 52.0°F 1.15 in 101.5°F 72.7°F 0.03 in
July 87.6°F 59.4°F 0.49 in 104.0°F 80.8°F 0.81 in
August 86.9°F 58.3°F 0.33 in 102.5°F 80.5°F 0.96 in
September 76.8°F 50.5°F 0.36 in 97.5°F 74.7°F 0.71 in
October 60.2°F 40.1°F 0.94 in 86.3°F 62.7°F 0.67 in
November 43.0°F 30.9°F 1.20 in 74.0°F 50.8°F 0.90 in
December 33.1°F 23.9°F 1.42 in 63.9°F 42.7°F 0.81 in
Coulee Dam overview
Full climate profile
 Phoenix overview
Full climate profile