Boonville, CA climate
Boonville has mild winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 39°, and about 3 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Boonville feels like
Winter
Spring
Summer
Fall
Boonville weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 57° | 39° | 7.8" | 0.3" | 17 | 0 | 44° – 53° |
| February | 59° | 39° | 7.1" | 1.2" | 15 | 0 | 44° – 55° |
| March | 63° | 40° | 6.0" | 0.6" | 14 | 0 | 45° – 58° |
| April | 66° | 42° | 2.6" | 0 | 11 | 0 | 49° – 59° |
| May | 72° | 46° | 1.2" | 0 | 7 | 0 | 53° – 65° |
| June | 79° | 50° | 0.4" | 0 | 2 | 0 | 60° – 70° |
| July | 86° | 53° | 0.0" | 0 | 0 | 0 | 66° – 73° |
| August | 86° | 53° | 0.1" | 0 | 0 | 0 | 67° – 73° |
| September | 83° | 50° | 0.2" | 0 | 1 | 0 | 63° – 71° |
| October | 75° | 46° | 1.8" | 0 | 5 | 0 | 56° – 67° |
| November | 63° | 41° | 4.1" | 0.1" | 11 | 0 | 44° – 56° |
| December | 56° | 38° | 8.5" | 0.3" | 16 | 0 | 44° – 51° |
| Year | 70° | 45° | 39.6" | 2.5" | 99 | 1 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Boonville
Boonville gets 40 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 99 days a year.
About 245 frost-free days a year
In half of years the last 32° night comes by March 19 and the first one by November 20. That leaves about 245 frost-free days for gardens, longer than 89% of U.S. towns.
Heating and cooling a home in Boonville
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Boonville, 78% of that work is heating and 22% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Boonville compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Boonville averaged 0.9° warmer than the 1900s. The biggest change is in January (+1.6°). The shift is smaller than in 73% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Boonville’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 45° to 58°. August is the most reliable, staying within 7°.
Common questions about Boonville’s climate
What is the coldest month in Boonville?
December, with a typical high of 56° and a low of 38°.
What is the hottest month in Boonville?
July, with a typical high of 86° and a low of 53°. About 61 days a year reach 90°.
How much snow does Boonville get?
About 3 inches in a normal winter, most of it in February.
When is the first frost in Boonville?
In half of years the first 32° night comes by November 20, and the last spring frost by March 19.
What is the rainiest month in Boonville?
December, with 8.5 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Boonville itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ukiah 4 Wsw, CA (10 mi, snow) and Ukiah, CA (13 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.