Keystone, SD vs Seattle, WA

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

Keystone is cooler than Seattle (45.7°F vs 53.8°F annual avg) and drier than it (24.1 in vs 36.5 in per year). Keystone has a Warm-summer humid continental climate; Seattle a Warm-summer Mediterranean 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

Seattle, WA

Annual avg
53.8°F
Annual precip
36.5 in
Warmest month
August (77.4°F)
Coldest month
December (36.2°F)
Annual swing
25.8°F
Pleasant months
4 / 12
Warm-summer Mediterranean Csb USDA Zone 9a

Best months to visit each city

Keystone

J
F
M
A
M
J
J
A
S
O
N
D

Seattle

J
F
M
A
M
J
J
A
S
O
N
D

Month-by-month comparison

Month Keystone Seattle
High Low Precip High Low Precip
January 36.8°F 18.8°F 0.48 in 48.6°F 36.8°F 5.21 in
February 36.3°F 18.4°F 0.76 in 50.7°F 36.8°F 3.71 in
March 44.2°F 25.4°F 1.35 in 54.8°F 39.4°F 3.94 in
April 50.2°F 31.8°F 2.62 in 59.8°F 43.6°F 2.89 in
May 59.6°F 41.5°F 4.80 in 66.5°F 49.3°F 1.98 in
June 71.1°F 51.9°F 3.58 in 71.2°F 54.0°F 1.22 in
July 78.7°F 59.1°F 3.59 in 77.3°F 57.5°F 0.56 in
August 77.5°F 58.0°F 2.29 in 77.4°F 58.1°F 0.83 in
September 69.1°F 49.6°F 1.76 in 71.7°F 53.9°F 1.37 in
October 55.0°F 36.8°F 1.80 in 61.0°F 46.4°F 3.49 in
November 44.4°F 27.0°F 0.59 in 53.0°F 39.9°F 5.80 in
December 36.6°F 19.8°F 0.50 in 47.8°F 36.2°F 5.49 in
Keystone overview
Full climate profile
 Seattle overview
Full climate profile