St. Marys, IA vs Phoenix, AZ

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

St. Marys is cooler than Phoenix (49.9°F vs 72.5°F annual avg) and wetter than it (37.8 in vs 8.9 in per year). St. Marys has a Hot-summer humid continental climate; Phoenix a Desert (hot) climate.

St. Marys, IA

Annual avg
49.9°F
Annual precip
37.8 in
Warmest month
July (85.5°F)
Coldest month
January (11.6°F)
Annual swing
53°F
Pleasant months
1 / 12
Hot-summer humid continental Dfa USDA Zone 6b

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. Marys

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. Marys Phoenix
High Low Precip High Low Precip
January 31.7°F 11.6°F 0.91 in 65.4°F 44.1°F 1.17 in
February 36.3°F 15.2°F 1.42 in 68.1°F 46.1°F 1.21 in
March 49.5°F 27.1°F 1.94 in 75.0°F 50.9°F 1.09 in
April 62.1°F 37.9°F 3.88 in 82.5°F 56.6°F 0.35 in
May 71.9°F 49.9°F 5.58 in 91.5°F 64.7°F 0.19 in
June 81.4°F 60.0°F 5.72 in 101.5°F 72.7°F 0.03 in
July 85.5°F 64.0°F 4.32 in 104.0°F 80.8°F 0.81 in
August 84.0°F 61.6°F 3.90 in 102.5°F 80.5°F 0.96 in
September 77.6°F 52.4°F 3.86 in 97.5°F 74.7°F 0.71 in
October 64.8°F 40.1°F 3.02 in 86.3°F 62.7°F 0.67 in
November 49.6°F 27.9°F 1.85 in 74.0°F 50.8°F 0.90 in
December 36.9°F 17.4°F 1.40 in 63.9°F 42.7°F 0.81 in
St. Marys overview
Full climate profile
 Phoenix overview
Full climate profile