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 station 2 km away. Updated through May 2026 — 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

115°F Sep 6, 2022

That is about 31°F hotter than a normal September afternoon in Santa Rosa (typical high near 84°F).

The three most extreme on record

1 115°F Sep 6, 2022recent

2 112°F Sep 5, 2022

3 110°F Sep 13, 1971

❄️ Coldest night

16°F Dec 9, 1972

About 22°F colder than a normal December night in Santa Rosa (typical low near 38°F).

The three most extreme on record

1 16°F Dec 9, 1972

2 17°F Dec 11, 1972

3 18°F Dec 22, 1990

🌧️ Most rain in one day

7.83 in Oct 24, 2021

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

The three most extreme on record

1 7.83 in Oct 24, 2021recent

2 5.66 in Feb 26, 2019

3 5.45 in Nov 21, 2024

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.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Santa Rosa's record heat sits well above even a hot day for the season — September's 115°F is about 31°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 mid-80s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 115°F and as low as 16°F. A single day has delivered over 8 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 NOAA's U.S. Climate Normals, measured at Santa Rosa (NOAA GHCN station USC00047965), about 2 km from the city centre.

How we build these numbers →

← Santa Rosa city detail