Great Falls, MT vs Phoenix, AZ

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

Great Falls is cooler than Phoenix (47°F vs 72.5°F annual avg) and wetter than it (15.4 in vs 8.9 in per year). Great Falls has a Semi-arid (cold) climate; Phoenix a Desert (hot) climate.

Great Falls, MT

Annual avg
47°F
Annual precip
15.4 in
Warmest month
July (85.8°F)
Coldest month
January (17.5°F)
Annual swing
43.2°F
Semi-arid (cold) BSk USDA Zone 7a

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

Great Falls

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 Great Falls Phoenix
High Low Precip High Low Precip
January 36.8°F 17.5°F 0.61 in 65.4°F 44.1°F 1.17 in
February 38.6°F 18.7°F 0.58 in 68.1°F 46.1°F 1.21 in
March 48.2°F 25.2°F 0.63 in 75.0°F 50.9°F 1.09 in
April 58.3°F 33.2°F 1.79 in 82.5°F 56.6°F 0.35 in
May 67.0°F 41.9°F 2.66 in 91.5°F 64.7°F 0.19 in
June 75.4°F 49.6°F 2.74 in 101.5°F 72.7°F 0.03 in
July 85.8°F 55.0°F 1.34 in 104.0°F 80.8°F 0.81 in
August 83.9°F 53.4°F 1.30 in 102.5°F 80.5°F 0.96 in
September 72.6°F 44.7°F 1.39 in 97.5°F 74.7°F 0.71 in
October 59.1°F 35.9°F 1.13 in 86.3°F 62.7°F 0.67 in
November 45.3°F 26.0°F 0.70 in 74.0°F 50.8°F 0.90 in
December 36.7°F 19.8°F 0.56 in 63.9°F 42.7°F 0.81 in
Great Falls overview
Full climate profile
 Phoenix overview
Full climate profile