Poso Park has mild winters and warm summers, with very little rain
A typical July afternoon reaches 90°, a January night drops to 33°, and about 6 inches of snow falls in a normal winter.
A year in Poso Park at a glance
Each month’s typical high and low, and what it brings.
What stands out about Poso Park’s climate
Read from where Poso Park sits among California’s towns. The page puts what stands out first.
Living with Poso Park’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
155 frost-free days. The last frost comes by May 11 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 17.
About 6" in a normal winter.
Months averaging under 55° run from November through April. Heating is 90% of the year’s heating-and-cooling load.
About 50 days a year reach 90°, and July afternoons average 90°.
The nicest months are May, June and October. 0.0 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →6 inches of snow, 22 of rain and melt
December is the wettest month and July the driest. Rain or snow falls on about 55 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 155 frost-free days a year
In half of years the last 32° night comes by May 11 and the first by October 17.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
What a year in Poso Park feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Warmer than it used to be
The last 30 years in Poso Park averaged 1.9° warmer than the 1900s. The biggest change is in January (+2.5°).
A bigger shift than in 91% of U.S. towns.
Change by month
How Poso Park compares
Against every U.S. town on TownTapestry, each counted once, with its place in California.
Poso Park 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 | 55° | 33° | 4.6" | 1.3" | 9 | 0 | 39° – 49° |
| February | 55° | 33° | 4.3" | 1.6" | 9 | 0 | 38° – 51° |
| March | 59° | 35° | 3.4" | 1.6" | 8 | 0 | 40° – 53° |
| April | 63° | 38° | 1.7" | 0.4" | 6 | 0 | 46° – 54° |
| May | 72° | 45° | 0.7" | 0 | 4 | 0 | 51° – 66° |
| June | 82° | 52° | 0.2" | 0 | 1 | 0 | 61° – 72° |
| July | 90° | 59° | 0.1" | 0 | 1 | 0 | 70° – 78° |
| August | 90° | 58° | 0.1" | 0 | 1 | 0 | 71° – 78° |
| September | 84° | 53° | 0.1" | 0 | 1 | 0 | 64° – 72° |
| October | 73° | 44° | 0.6" | 0 | 3 | 0 | 55° – 64° |
| November | 61° | 36° | 1.8" | 0.1" | 6 | 0 | 42° – 54° |
| December | 54° | 32° | 4.6" | 1.2" | 8 | 0 | 40° – 47° |
| Year | 70° | 43° | 22.2" | 6.2" | 55 | 1 |
Heating and cooling a home in Poso Park
90% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 51° to 66°. August is the most reliable, staying within 7°.
Common questions about Poso Park’s climate
What is the coldest month in Poso Park?
December, with a typical high of 54° and a low of 32°.
What is the hottest month in Poso Park?
July, with a typical high of 90° and a low of 59°. About 50 days a year reach 90°.
How much snow does Poso Park get?
About 6 inches in a normal winter, most of it in February.
When is the first frost in Poso Park?
In half of years the first 32° night comes by October 17, and the last spring frost by May 11.
What is the rainiest month in Poso Park?
December, with 4.6 inches of rain and melted snow. The year totals 22 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Poso Park.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Poso Park itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Glennville, CA (7 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.