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Boulder, CO vs Phoenix, AZ weather comparison

Boulder

CO

Boulder picks up around 90 more inches of snow each winter.

Phoenix has around 141 fewer freezing nights a year. Phoenix endures about 131 more days above 90 °F each year.

The year at a glance

Averages from 30 years of climate history, 1991-2020

Annual weather statistics for Boulder, CO and Phoenix, AZ
BoulderMetricPhoenix
264 daysSunny daysclear or partly cloudy skies307 days
21 inPrecipitationper year7 in
101 daysWet daysrain or snow per year33 days
90 inSnowfallper year0 in
32 daysHot daysabove 90 °F163 days
142 daysFreezing nightsat or below 32 °F2 days
61%Humidityaverage relative35%
51 °FAverage temperatureyear round74 °F

Monthly temperatures

Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.

BoulderPhoenix

Daily highs

6080100JanMarMayJulSepNovBoulder, Jan: 46 °FBoulder, Feb: 48 °FBoulder, Mar: 56 °FBoulder, Apr: 62 °FBoulder, May: 71 °FBoulder, Jun: 82 °FBoulder, Jul: 88 °FBoulder, Aug: 86 °FBoulder, Sep: 78 °FBoulder, Oct: 65 °FBoulder, Nov: 54 °FBoulder, Dec: 46 °FPhoenix, Jan: 66 °FPhoenix, Feb: 69 °FPhoenix, Mar: 76 °FPhoenix, Apr: 83 °FPhoenix, May: 92 °FPhoenix, Jun: 102 °FPhoenix, Jul: 105 °FPhoenix, Aug: 103 °FPhoenix, Sep: 98 °FPhoenix, Oct: 87 °FPhoenix, Nov: 75 °FPhoenix, Dec: 65 °F

Daily lows

20406080JanMarMayJulSepNovBoulder, Jan: 21 °FBoulder, Feb: 22 °FBoulder, Mar: 29 °FBoulder, Apr: 34 °FBoulder, May: 42 °FBoulder, Jun: 51 °FBoulder, Jul: 56 °FBoulder, Aug: 55 °FBoulder, Sep: 48 °FBoulder, Oct: 37 °FBoulder, Nov: 28 °FBoulder, Dec: 21 °FPhoenix, Jan: 44 °FPhoenix, Feb: 47 °FPhoenix, Mar: 52 °FPhoenix, Apr: 58 °FPhoenix, May: 67 °FPhoenix, Jun: 75 °FPhoenix, Jul: 82 °FPhoenix, Aug: 82 °FPhoenix, Sep: 76 °FPhoenix, Oct: 64 °FPhoenix, Nov: 51 °FPhoenix, Dec: 43 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Boulder high464856627182888678655446
Phoenix high666976839210210510398877565
Boulder low212229344251565548372821
Phoenix low444752586775828276645143

Monthly precipitation

Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.

BoulderPhoenix
0.01.02.03.0JanMarMayJulSepNovBoulder, Jan: 0.8 inBoulder, Feb: 0.8 inBoulder, Mar: 1.6 inBoulder, Apr: 2.5 inBoulder, May: 3.3 inBoulder, Jun: 2.5 inBoulder, Jul: 2.4 inBoulder, Aug: 2.3 inBoulder, Sep: 1.7 inBoulder, Oct: 1.5 inBoulder, Nov: 1.0 inBoulder, Dec: 0.7 inPhoenix, Jan: 0.9 inPhoenix, Feb: 1.1 inPhoenix, Mar: 0.8 inPhoenix, Apr: 0.2 inPhoenix, May: 0.1 inPhoenix, Jun: 0.1 inPhoenix, Jul: 0.6 inPhoenix, Aug: 0.9 inPhoenix, Sep: 0.7 inPhoenix, Oct: 0.6 inPhoenix, Nov: 0.5 inPhoenix, Dec: 0.8 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Boulder0.80.81.62.53.32.52.42.31.71.51.00.7
Phoenix0.91.10.80.20.10.10.60.90.70.60.50.8

Monthly sunny days

Days each month with clear or partly cloudy skies, so compare the same month between cities.

BoulderPhoenix
0102030JanMarMayJulSepNovBoulder, Jan: 22 daysBoulder, Feb: 19 daysBoulder, Mar: 21 daysBoulder, Apr: 18 daysBoulder, May: 20 daysBoulder, Jun: 23 daysBoulder, Jul: 24 daysBoulder, Aug: 23 daysBoulder, Sep: 24 daysBoulder, Oct: 23 daysBoulder, Nov: 23 daysBoulder, Dec: 23 daysPhoenix, Jan: 23 daysPhoenix, Feb: 21 daysPhoenix, Mar: 25 daysPhoenix, Apr: 27 daysPhoenix, May: 29 daysPhoenix, Jun: 29 daysPhoenix, Jul: 24 daysPhoenix, Aug: 26 daysPhoenix, Sep: 28 daysPhoenix, Oct: 28 daysPhoenix, Nov: 25 daysPhoenix, Dec: 24 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Boulder221921182023242324232323
Phoenix232125272929242628282524

Keep comparing

Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.

Boulder vs another city

See the full Boulder, CO climate profile

More Colorado cities

Phoenix vs another city

See the full Phoenix, AZ climate profile

More Arizona cities

About this data

Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).