St. Louis, MI vs Phoenix, AZ

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

St. Louis is cooler than Phoenix (47°F vs 72.5°F annual avg) and wetter than it (34.5 in vs 8.9 in per year). St. Louis has a Warm-summer humid continental climate; Phoenix a Desert (hot) climate.

St. Louis, MI

Annual avg
47°F
Annual precip
34.5 in
Warmest month
July (82.2°F)
Coldest month
January (15.0°F)
Annual swing
48.8°F
Pleasant months
1 / 12
Warm-summer humid continental Dfb 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

St. Louis

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 St. Louis Phoenix
High Low Precip High Low Precip
January 29.1°F 15.0°F 2.17 in 65.4°F 44.1°F 1.17 in
February 32.0°F 15.4°F 1.76 in 68.1°F 46.1°F 1.21 in
March 42.6°F 23.4°F 2.10 in 75.0°F 50.9°F 1.09 in
April 55.9°F 34.5°F 3.46 in 82.5°F 56.6°F 0.35 in
May 68.5°F 45.6°F 3.73 in 91.5°F 64.7°F 0.19 in
June 78.1°F 55.6°F 3.64 in 101.5°F 72.7°F 0.03 in
July 82.2°F 59.3°F 3.26 in 104.0°F 80.8°F 0.81 in
August 80.1°F 57.8°F 3.71 in 102.5°F 80.5°F 0.96 in
September 72.9°F 49.7°F 2.73 in 97.5°F 74.7°F 0.71 in
October 60.0°F 39.4°F 3.24 in 86.3°F 62.7°F 0.67 in
November 45.8°F 29.7°F 2.66 in 74.0°F 50.8°F 0.90 in
December 34.5°F 21.9°F 2.04 in 63.9°F 42.7°F 0.81 in
St. Louis overview
Full climate profile
 Phoenix overview
Full climate profile