Few U.S. towns have cooler summers than Jenner
Deep winter brings January lows near 43°. The year changes little: the coldest month’s nights and the warmest month’s afternoons are only 27° apart. Its yearly precipitation tops that of 96% of U.S. towns. Homes need heating from December to January, the months averaging under 50°.
A year in Jenner at a glance
Each month’s typical high and low, and what it brings.
What stands out about Jenner’s climate
Compared with towns across the U.S., with Jenner’s place in California beside it.
What a year in Jenner feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
A freeze most winters
Frost and day counts come from NOAA’s station at Ft Ross, CA, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Jenner’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 31°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 58 inches of rain a year
December is the wettest month and July the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Jenner
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from November through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Ft Ross, CA.
Living with Jenner’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 9 winters in 10, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 3.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Jenner from natural hazards, landslides are the largest share (37%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Jenner and similar climates
TownRatings has no climate map of the towns around Jenner yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Jenner averaged 1.2° warmer than the 1900s. The biggest change is in January (+1.9°).
A smaller shift than in 60% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Jenner compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Jenner’s place among California’s.
Jenner weather by month
Highs, lows and precipitation from NOAA’s grid at Jenner’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 56° | 43° | 11.1" | 46° – 54° |
| February | 57° | 44° | 11.0" | 46° – 56° |
| March | 59° | 44° | 7.9" | 46° – 56° |
| April | 60° | 45° | 4.3" | 48° – 56° |
| May | 64° | 47° | 1.8" | 51° – 58° |
| June | 67° | 49° | 0.5" | 55° – 60° |
| July | 69° | 52° | 0.0" | 58° – 63° |
| August | 70° | 53° | 0.1" | 59° – 65° |
| September | 70° | 52° | 0.2" | 58° – 65° |
| October | 67° | 50° | 2.4" | 55° – 64° |
| November | 61° | 46° | 6.4" | 48° – 56° |
| December | 56° | 43° | 12.2" | 47° – 55° |
| Year | 63° | 47° | 57.9" |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 46° to 56°. June is the most reliable, staying within 5°.
Where Jenner’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Jenner’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Ft Ross, CA, 7 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Jenner’s climate
What is the weather like in Jenner?
A typical July afternoon reaches 69°, a January night drops to 43°. Milder January nights than 92% of U.S. towns; cooler July afternoons than all but 68 U.S. towns.
How cold does it get in Jenner in winter?
January nights average 43°. About 12 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 46°.
How hot does it get in Jenner?
July, with a typical high of 69°. 90° days are rare: none in a normal year at Ft Ross, CA.
When is the first and last frost in Jenner?
There is no reliable frost date: a 32° night comes in about 87% of winters at Ft Ross, CA, so most years bring a freeze but some pass without one.
What growing zone is Jenner in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 31°.
What is the best time of year to visit Jenner?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Jenner getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Jenner.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.