Photo: CrabTree13 · CC BY-SA 3.0Geyserville reaches 100° on about 11 days a year, more than 91% of U.S. towns
On a normal January night the air cools to about 38°. By January nights alone, it runs milder than 85% of U.S. towns. Decade by decade the climate has edged up, 1.3° above 1901–2000. Plan time outside from March to June and October to November, when highs sit at 65–84°.
A year in Geyserville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Geyserville’s climate
Compared with towns across the U.S., with Geyserville’s place in California beside it.
What a year in Geyserville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 292 frost-free days a year
In half of years the last 32° night comes by February 15 and the first by December 2. Frost and day counts come from NOAA’s station at Healdsburg, CA, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Geyserville’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 25°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 38 inches of rain a year
December is the wettest month and July the driest. Rain falls on about 77 days a year. Snow is rare: about 0.0" in a normal year at Healdsburg, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Geyserville
76% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Healdsburg, CA.
Living with Geyserville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
292 frost-free days in zone 9a. The last frost comes by Feb 15 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 2.
Months with highs of 62–84° and lows of 40° or more: March, April, May, June, October and November. 1.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Geyserville from natural hazards, earthquakes are the largest share (33%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Geyserville and similar climates
TownRatings has no climate map of the towns around Geyserville yet.
Climates most like Geyserville’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Geyserville, CA | 38° | 88° | 38" | 0.0" |
| Roseburg, OR | 37° | 86° | 34" | 0.0" |
| Rock Hill, SC | 31° | 90° | 44" | 0.2" |
| Marvin, NC | 31° | 91° | 43" | 0.2" |
| Port Lavaca, TX | 46° | 91° | 40" | 0.0" |
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 Geyserville averaged 1.3° warmer than the 1900s. The biggest change is in January (+1.8°).
A smaller shift than in 51% 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 Geyserville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Geyserville’s place among California’s.
Geyserville weather by month
Highs, lows and precipitation from NOAA’s grid at Geyserville’s center; snow, wet days and snow on the ground from Healdsburg, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 58° | 38° | 7.5" | 0.0" | 14 | 0 | 44° – 55° |
| February | 61° | 39° | 7.4" | 0.0" | 12 | 0 | 44° – 57° |
| March | 65° | 41° | 5.4" | 0.0" | 12 | 0 | 46° – 60° |
| April | 70° | 43° | 2.5" | 0.0" | 8 | 0 | 49° – 60° |
| May | 77° | 47° | 1.4" | 0.0" | 5 | 0 | 55° – 70° |
| June | 84° | 52° | 0.3" | 0.0" | 1 | 0 | 63° – 71° |
| July | 88° | 53° | 0.0" | 0.0" | 0 | 0 | 68° – 75° |
| August | 88° | 53° | 0.0" | 0.0" | 0 | 0 | 67° – 74° |
| September | 85° | 51° | 0.1" | 0.0" | 1 | 0 | 65° – 72° |
| October | 77° | 46° | 1.7" | 0.0" | 4 | 0 | 57° – 69° |
| November | 65° | 41° | 3.9" | 0.0" | 8 | 0 | 45° – 57° |
| December | 57° | 37° | 7.9" | 0.0" | 13 | 0 | 44° – 51° |
| Year | 73° | 45° | 38.0" | 0.0" | 77 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 55° to 70°. June is the most reliable, staying within 7°.
Where Geyserville’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 Geyserville’s center.
- Snow: Healdsburg, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Healdsburg, CA, 6 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 Geyserville’s climate
What is the weather like in Geyserville?
A typical July afternoon reaches 88°, a January night drops to 38°, and snow is almost unheard of. Milder January nights than 85% of U.S. towns; hotter July afternoons than 67% of U.S. towns.
How cold does it get in Geyserville in winter?
December nights average 37°. About 13 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 44°.
How much snow does Geyserville get?
About 0.0 inches in a normal winter at Healdsburg, CA, so most winters see none.
How hot does it get in Geyserville?
July, with a typical high of 88° and a low of 53°. About 58 days a year reach 90° and 11 reach 100° (Healdsburg, CA).
When is the first and last frost in Geyserville?
In half of years the last spring frost (32°) comes by February 15 and the first fall frost by December 2, about 292 frost-free days, at Healdsburg, CA.
What growing zone is Geyserville in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 25°.
What is the best time of year to visit Geyserville?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, May, June, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Geyserville getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 51% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Geyserville.
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.