Waltham, MA vs Phoenix, AZ

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

Waltham is cooler than Phoenix (50.5°F vs 72.5°F annual avg) and wetter than it (42.6 in vs 8.9 in per year). Waltham has a Hot-summer humid continental climate; Phoenix a Desert (hot) climate.

Waltham, MA

Annual avg
50.5°F
Annual precip
42.6 in
Warmest month
July (85.1°F)
Coldest month
January (18.2°F)
Annual swing
46.1°F
Pleasant months
2 / 12
Hot-summer humid continental Dfa USDA Zone 7a

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

Waltham

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 Waltham Phoenix
High Low Precip High Low Precip
January 36.8°F 18.2°F 2.90 in 65.4°F 44.1°F 1.17 in
February 39.4°F 19.3°F 2.69 in 68.1°F 46.1°F 1.21 in
March 47.5°F 27.2°F 3.85 in 75.0°F 50.9°F 1.09 in
April 59.9°F 37.1°F 3.84 in 82.5°F 56.6°F 0.35 in
May 70.4°F 46.7°F 3.36 in 91.5°F 64.7°F 0.19 in
June 79.4°F 56.2°F 3.72 in 101.5°F 72.7°F 0.03 in
July 85.1°F 62.0°F 3.51 in 104.0°F 80.8°F 0.81 in
August 83.6°F 60.3°F 3.47 in 102.5°F 80.5°F 0.96 in
September 75.7°F 51.8°F 3.54 in 97.5°F 74.7°F 0.71 in
October 63.6°F 40.8°F 4.24 in 86.3°F 62.7°F 0.67 in
November 52.4°F 32.4°F 3.72 in 74.0°F 50.8°F 0.90 in
December 42.0°F 24.0°F 3.76 in 63.9°F 42.7°F 0.81 in
Waltham overview
Full climate profile
 Phoenix overview
Full climate profile