Castle Rock, WA vs Seattle, WA

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

Castle Rock is about the same temperature as Seattle (53.2°F vs 53.8°F annual avg) and wetter than it (48.1 in vs 36.5 in per year). Both cities share a Warm-summer Mediterranean climate (Csb).

Castle Rock, WA

Annual avg
53.2°F
Annual precip
48.1 in
Warmest month
August (80.4°F)
Coldest month
February (34.7°F)
Annual swing
26.2°F
Pleasant months
1 / 12
Warm-summer Mediterranean Csb USDA Zone 8b

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

Castle Rock

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 Castle Rock Seattle
High Low Precip High Low Precip
January 47.7°F 35.1°F 6.53 in 48.6°F 36.8°F 5.21 in
February 52.0°F 34.7°F 4.81 in 50.7°F 36.8°F 3.71 in
March 56.9°F 37.5°F 4.91 in 54.8°F 39.4°F 3.94 in
April 62.1°F 40.4°F 4.08 in 59.8°F 43.6°F 2.89 in
May 68.8°F 45.3°F 3.11 in 66.5°F 49.3°F 1.98 in
June 72.9°F 49.5°F 2.03 in 71.2°F 54.0°F 1.22 in
July 79.3°F 53.4°F 0.63 in 77.3°F 57.5°F 0.56 in
August 80.4°F 53.3°F 0.97 in 77.4°F 58.1°F 0.83 in
September 75.7°F 49.6°F 2.29 in 71.7°F 53.9°F 1.37 in
October 64.0°F 44.1°F 4.38 in 61.0°F 46.4°F 3.49 in
November 53.0°F 38.6°F 7.24 in 53.0°F 39.9°F 5.80 in
December 46.6°F 34.8°F 7.14 in 47.8°F 36.2°F 5.49 in
Castle Rock overview
Full climate profile
 Seattle overview
Full climate profile