Petaluma, CA vs Phoenix, AZ

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

Petaluma is cooler than Phoenix (58°F vs 72.5°F annual avg) and wetter than it (25.6 in vs 8.9 in per year). Petaluma has a Warm-summer Mediterranean climate; Phoenix a Desert (hot) climate.

Petaluma, CA

Annual avg
58°F
Annual precip
25.6 in
Warmest month
September (81.6°F)
Coldest month
December (38.4°F)
Annual swing
18.9°F
Pleasant months
1 / 12
Warm-summer Mediterranean Csb USDA Zone 9a

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

Petaluma

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 Petaluma Phoenix
High Low Precip High Low Precip
January 57.6°F 39.0°F 4.77 in 65.4°F 44.1°F 1.17 in
February 61.3°F 40.4°F 5.23 in 68.1°F 46.1°F 1.21 in
March 64.5°F 41.9°F 3.32 in 75.0°F 50.9°F 1.09 in
April 67.8°F 43.8°F 1.68 in 82.5°F 56.6°F 0.35 in
May 71.9°F 47.4°F 0.93 in 91.5°F 64.7°F 0.19 in
June 78.1°F 50.4°F 0.28 in 101.5°F 72.7°F 0.03 in
July 80.8°F 52.4°F 0.01 in 104.0°F 80.8°F 0.81 in
August 81.2°F 52.8°F 0.05 in 102.5°F 80.5°F 0.96 in
September 81.6°F 51.4°F 0.09 in 97.5°F 74.7°F 0.71 in
October 76.4°F 47.6°F 1.27 in 86.3°F 62.7°F 0.67 in
November 65.5°F 42.3°F 2.74 in 74.0°F 50.8°F 0.90 in
December 57.9°F 38.4°F 5.19 in 63.9°F 42.7°F 0.81 in
Petaluma overview
Full climate profile
 Phoenix overview
Full climate profile