Keystone, SD vs Phoenix, AZ

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

Keystone is cooler than Phoenix (45.7°F vs 72.5°F annual avg) and wetter than it (24.1 in vs 8.9 in per year). Keystone has a Warm-summer humid continental climate; Phoenix a Desert (hot) climate.

Keystone, SD

Annual avg
45.7°F
Annual precip
24.1 in
Warmest month
July (78.7°F)
Coldest month
February (18.4°F)
Annual swing
41.6°F
Pleasant months
3 / 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

Keystone

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 Keystone Phoenix
High Low Precip High Low Precip
January 36.8°F 18.8°F 0.48 in 65.4°F 44.1°F 1.17 in
February 36.3°F 18.4°F 0.76 in 68.1°F 46.1°F 1.21 in
March 44.2°F 25.4°F 1.35 in 75.0°F 50.9°F 1.09 in
April 50.2°F 31.8°F 2.62 in 82.5°F 56.6°F 0.35 in
May 59.6°F 41.5°F 4.80 in 91.5°F 64.7°F 0.19 in
June 71.1°F 51.9°F 3.58 in 101.5°F 72.7°F 0.03 in
July 78.7°F 59.1°F 3.59 in 104.0°F 80.8°F 0.81 in
August 77.5°F 58.0°F 2.29 in 102.5°F 80.5°F 0.96 in
September 69.1°F 49.6°F 1.76 in 97.5°F 74.7°F 0.71 in
October 55.0°F 36.8°F 1.80 in 86.3°F 62.7°F 0.67 in
November 44.4°F 27.0°F 0.59 in 74.0°F 50.8°F 0.90 in
December 36.6°F 19.8°F 0.50 in 63.9°F 42.7°F 0.81 in
Keystone overview
Full climate profile
 Phoenix overview
Full climate profile