Skip to content
VSWeather

Rohnert Park, CA vs St. Helena, CA weather comparison

Rohnert Park

CA

St. Helena endures about 28 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 Rohnert Park, CA and St. Helena, CA
Rohnert ParkMetricSt. Helena
254 daysSunny daysclear or partly cloudy skies259 days
28 inPrecipitationper year27 in
59 daysWet daysrain or snow per year58 days
0 inSnowfallper year0 in
26 daysHot daysabove 90 °F54 days
23 daysFreezing nightsat or below 32 °F14 days
72%Humidityaverage relative66%
58 °FAverage temperatureyear round61 °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.

Rohnert ParkSt. Helena

Daily highs

60708090JanMarMayJulSepNovRohnert Park, Jan: 59 °FRohnert Park, Feb: 62 °FRohnert Park, Mar: 66 °FRohnert Park, Apr: 69 °FRohnert Park, May: 74 °FRohnert Park, Jun: 80 °FRohnert Park, Jul: 82 °FRohnert Park, Aug: 83 °FRohnert Park, Sep: 83 °FRohnert Park, Oct: 78 °FRohnert Park, Nov: 66 °FRohnert Park, Dec: 58 °FSt. Helena, Jan: 59 °FSt. Helena, Feb: 62 °FSt. Helena, Mar: 67 °FSt. Helena, Apr: 72 °FSt. Helena, May: 78 °FSt. Helena, Jun: 85 °FSt. Helena, Jul: 89 °FSt. Helena, Aug: 89 °FSt. Helena, Sep: 87 °FSt. Helena, Oct: 78 °FSt. Helena, Nov: 66 °FSt. Helena, Dec: 58 °F

Daily lows

4050JanMarMayJulSepNovRohnert Park, Jan: 38 °FRohnert Park, Feb: 40 °FRohnert Park, Mar: 42 °FRohnert Park, Apr: 44 °FRohnert Park, May: 47 °FRohnert Park, Jun: 50 °FRohnert Park, Jul: 52 °FRohnert Park, Aug: 52 °FRohnert Park, Sep: 51 °FRohnert Park, Oct: 47 °FRohnert Park, Nov: 42 °FRohnert Park, Dec: 38 °FSt. Helena, Jan: 40 °FSt. Helena, Feb: 42 °FSt. Helena, Mar: 44 °FSt. Helena, Apr: 46 °FSt. Helena, May: 51 °FSt. Helena, Jun: 54 °FSt. Helena, Jul: 56 °FSt. Helena, Aug: 56 °FSt. Helena, Sep: 54 °FSt. Helena, Oct: 49 °FSt. Helena, Nov: 44 °FSt. Helena, Dec: 40 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rohnert Park high596266697480828383786658
St. Helena high596267727885898987786658
Rohnert Park low384042444750525251474238
St. Helena low404244465154565654494440

Monthly precipitation

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

Rohnert ParkSt. Helena
0.02.04.06.0JanMarMayJulSepNovRohnert Park, Jan: 5.4 inRohnert Park, Feb: 5.7 inRohnert Park, Mar: 4.2 inRohnert Park, Apr: 1.9 inRohnert Park, May: 1.0 inRohnert Park, Jun: 0.2 inRohnert Park, Jul: 0.0 inRohnert Park, Aug: 0.0 inRohnert Park, Sep: 0.1 inRohnert Park, Oct: 1.2 inRohnert Park, Nov: 2.8 inRohnert Park, Dec: 5.5 inSt. Helena, Jan: 5.4 inSt. Helena, Feb: 5.4 inSt. Helena, Mar: 4.0 inSt. Helena, Apr: 1.7 inSt. Helena, May: 1.0 inSt. Helena, Jun: 0.3 inSt. Helena, Jul: 0.0 inSt. Helena, Aug: 0.0 inSt. Helena, Sep: 0.1 inSt. Helena, Oct: 1.3 inSt. Helena, Nov: 2.7 inSt. Helena, Dec: 5.5 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rohnert Park5.45.74.21.91.00.20.00.00.11.22.85.5
St. Helena5.45.44.01.71.00.30.00.00.11.32.75.5

Monthly sunny days

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

Rohnert ParkSt. Helena
0102030JanMarMayJulSepNovRohnert Park, Jan: 13 daysRohnert Park, Feb: 13 daysRohnert Park, Mar: 16 daysRohnert Park, Apr: 20 daysRohnert Park, May: 23 daysRohnert Park, Jun: 26 daysRohnert Park, Jul: 29 daysRohnert Park, Aug: 29 daysRohnert Park, Sep: 28 daysRohnert Park, Oct: 24 daysRohnert Park, Nov: 18 daysRohnert Park, Dec: 15 daysSt. Helena, Jan: 14 daysSt. Helena, Feb: 13 daysSt. Helena, Mar: 16 daysSt. Helena, Apr: 19 daysSt. Helena, May: 24 daysSt. Helena, Jun: 27 daysSt. Helena, Jul: 30 daysSt. Helena, Aug: 30 daysSt. Helena, Sep: 28 daysSt. Helena, Oct: 25 daysSt. Helena, Nov: 18 daysSt. Helena, Dec: 15 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Rohnert Park131316202326292928241815
St. Helena141316192427303028251815

Keep comparing

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

Rohnert Park vs another city

See the full Rohnert Park, CA climate profile

More California cities

St. Helena vs another city

See the full St. Helena, CA climate profile

More California 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).