Climateby Month

Seattle vs Denver weather

Seattle, WA and Denver, CO · 1020 mi apart

July highs: 77°F in Seattle, 90°F in Denver (Denver is 13°F warmer). January highs: 47°F and 47°F. Seattle has about 163 wet days a year, Denver about 84. Snow: 3.8 in a year in Seattle, 49.0 in in Denver.

Seattle, WA

0°20°40°60°80°100° January: normal high 47°F (8°C), low 37°F (3°C) 47° 37° February: normal high 50°F (10°C), low 37°F (3°C) March: normal high 54°F (12°C), low 39°F (4°C) April: normal high 59°F (15°C), low 43°F (6°C) May: normal high 65°F (18°C), low 48°F (9°C) June: normal high 70°F (21°C), low 53°F (12°C) July: normal high 77°F (25°C), low 57°F (14°C) 77° 57° August: normal high 77°F (25°C), low 57°F (14°C) September: normal high 71°F (22°C), low 53°F (12°C) October: normal high 61°F (16°C), low 47°F (8°C) November: normal high 52°F (11°C), low 41°F (5°C) December: normal high 47°F (8°C), low 37°F (3°C) JFMAMJJASOND

Best months: June, July, August

Denver, CO

0°20°40°60°80°100° January: normal high 47°F (8°C), low 18°F (-8°C) February: normal high 48°F (9°C), low 19°F (-7°C) March: normal high 56°F (13°C), low 27°F (-3°C) April: normal high 63°F (17°C), low 34°F (1°C) May: normal high 72°F (22°C), low 43°F (6°C) June: normal high 84°F (29°C), low 53°F (12°C) July: normal high 90°F (32°C), low 59°F (15°C) 90° 59° August: normal high 88°F (31°C), low 57°F (14°C) September: normal high 80°F (27°C), low 48°F (9°C) October: normal high 67°F (19°C), low 36°F (2°C) November: normal high 55°F (13°C), low 26°F (-3°C) December: normal high 46°F (8°C), low 18°F (-8°C) 46° 18° JFMAMJJASOND

Best months: May

Which city for what

  • Cooler summers: Seattle (July high 77°F vs July high 90°F)
  • Fewer wet days: Denver (84 a year vs 163 a year)
  • Less snow: Seattle (3.8 in vs 49.0 in)
  • Longer growing season: Seattle (259 frost-free days vs 156 frost-free days)
  • More comfortable days: Seattle (117 a year vs 92 a year)

Listed only where the difference is at least 3°F in highs, 10 days a year or 3 in of snow.

Season by season

SeasonAvg high SeattleAvg high DenverWet days SeattleWet days Denver
Winter (Dec-Feb)48°F47°F5315
Spring (Mar-May)59°F64°F4626
Summer (Jun-Aug)75°F87°F2226
Fall (Sep-Nov)61°F67°F4217

Side by side over a year

SeattleDenver
Hot days (90°F+)242
Freezing nights25156
Muggy days00
Comfortable days11792
Precipitation37.8 in15.4 in
Snowfall3.8 in49.0 in
Frost dateslast Mar 8, first Nov 23last May 4, first Oct 8
Daylight in June / December15.9 h / 8.5 h14.9 h / 9.4 h
Best monthsJune, July, AugustMay

Day counts from each city's daily records, 1991-2020. Comfortable days: highs 65-80°F and dew point under 60°F.

Month by month

MonthHigh SeattleHigh DenverWet days SeattleWet days Denver
January47°F47°F195
February50°F48°F165
March54°F56°F187
April59°F63°F168
May65°F72°F1211
June70°F84°F118
July77°F90°F59
August77°F88°F69
September71°F80°F96
October61°F67°F155
November52°F55°F196
December47°F46°F195

Both charts use the same temperature scale.

Where the numbers come from

  • Seattle, WA: temperature from Seattle Sand Pt WSFO (USW00094290), 6.6 mi NNE of the city center; precipitation from Seattle Sand Pt WSFO (USW00094290). NOAA 1991-2020 normals and daily records.
  • Denver, CO: temperature from Denver-Stapleton (USW00023062), 6.3 mi ENE of the city center; precipitation from Denver-Stapleton (USW00023062). NOAA 1991-2020 normals and daily records.

Every station for each city, including humidity and frost, is listed on the city page. Methodology.