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Weather extremes

How extreme does Santa Rosa's weather get?

The hottest, coldest, wettest and snowiest days Santa Rosa has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1971–present), from the Santa Rosa Aero station 6 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Santa Rosa has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
113°F Jan 18, 2014

That is about 23°F hotter than a normal January afternoon in Santa Rosa (typical high near 90°F).

The three most extreme on record

1 113°F Jan 18, 2014
2 110°F Jan 17, 2014
3 110°F Jan 22, 2017
❄️ Coldest night
12°F Jul 10, 1988

About 23°F colder than a normal July night in Santa Rosa (typical low near 35°F).

The three most extreme on record

1 12°F Jul 10, 1988
2 12°F Jul 9, 2007
3 13°F Jul 10, 2007
🌧️ Most rain in one day
12.99 in Feb 20, 1980

More rain in a single day than Santa Rosa usually gets in the whole month of February (typical February total about 1.6 in).

The three most extreme on record

1 12.99 in Feb 20, 1980
2 9.84 in Feb 14, 1983
3 7.56 in Mar 9, 2010

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-10°10°30°50°70°90°110°130° all-time high 113°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Santa Rosa's record heat sits well above even a hot day for the season — January's 113°F is about 23°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Santa Rosa's warmest days reach the low 90s°F and its coldest nights drop to the mid-30s°F. But across the record it has gone as high as 113°F and as low as 12°F. A single day has delivered over 13 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at Santa_rosa_aero, about 3 km from the city centre.

How we build these numbers →