Napa, CA vs Phoenix, AZ

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

Napa is cooler than Phoenix (60.3°F vs 72.5°F annual avg) and wetter than it (26.7 in vs 8.9 in per year). Napa has a Warm-summer Mediterranean climate; Phoenix a Desert (hot) climate.

Napa, CA

Annual avg
60.3°F
Annual precip
26.7 in
Warmest month
September (84.4°F)
Coldest month
December (39.7°F)
Annual swing
20.5°F
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

Napa

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 Napa Phoenix
High Low Precip High Low Precip
January 58.6°F 40.1°F 4.98 in 65.4°F 44.1°F 1.17 in
February 63.2°F 41.9°F 5.13 in 68.1°F 46.1°F 1.21 in
March 67.5°F 43.6°F 3.67 in 75.0°F 50.9°F 1.09 in
April 72.1°F 45.6°F 1.72 in 82.5°F 56.6°F 0.35 in
May 76.6°F 49.9°F 1.08 in 91.5°F 64.7°F 0.19 in
June 82.3°F 53.7°F 0.29 in 101.5°F 72.7°F 0.03 in
July 83.3°F 55.5°F 0.00 in 104.0°F 80.8°F 0.81 in
August 83.7°F 55.5°F 0.06 in 102.5°F 80.5°F 0.96 in
September 84.4°F 53.4°F 0.09 in 97.5°F 74.7°F 0.71 in
October 78.1°F 49.3°F 1.34 in 86.3°F 62.7°F 0.67 in
November 66.2°F 43.6°F 2.77 in 74.0°F 50.8°F 0.90 in
December 58.5°F 39.7°F 5.53 in 63.9°F 42.7°F 0.81 in
Napa overview
Full climate profile
 Phoenix overview
Full climate profile