St. Marys, PA vs Seattle, WA

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

St. Marys is cooler than Seattle (45.1°F vs 53.8°F annual avg) and wetter than it (46.4 in vs 36.5 in per year). St. Marys has a Warm-summer humid continental climate; Seattle a Warm-summer Mediterranean climate.

St. Marys, PA

Annual avg
45.1°F
Annual precip
46.4 in
Warmest month
July (78.5°F)
Coldest month
January (13.1°F)
Annual swing
45°F
Pleasant months
3 / 12
Warm-summer humid continental Dfb USDA Zone 6b

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

St. Marys

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 St. Marys Seattle
High Low Precip High Low Precip
January 30.5°F 13.1°F 3.47 in 48.6°F 36.8°F 5.21 in
February 33.3°F 13.5°F 2.68 in 50.7°F 36.8°F 3.71 in
March 42.5°F 20.9°F 3.38 in 54.8°F 39.4°F 3.94 in
April 56.4°F 31.0°F 3.95 in 59.8°F 43.6°F 2.89 in
May 67.4°F 41.9°F 4.32 in 66.5°F 49.3°F 1.98 in
June 74.7°F 50.8°F 4.48 in 71.2°F 54.0°F 1.22 in
July 78.5°F 55.0°F 4.67 in 77.3°F 57.5°F 0.56 in
August 77.4°F 53.7°F 4.25 in 77.4°F 58.1°F 0.83 in
September 71.1°F 47.5°F 3.95 in 71.7°F 53.9°F 1.37 in
October 58.7°F 37.0°F 3.87 in 61.0°F 46.4°F 3.49 in
November 45.6°F 28.0°F 3.78 in 53.0°F 39.9°F 5.80 in
December 34.5°F 19.7°F 3.60 in 47.8°F 36.2°F 5.49 in
St. Marys overview
Full climate profile
 Seattle overview
Full climate profile