Photo: Tranistrider1979 · CC BY-SA 3.0Mountain House reaches 100° on about 17 days a year, more than 94% of U.S. towns
January nights here settle around 40°. Winter and summer sit 53° apart. It is a dry place: less rain and snow fall here than on 97% of U.S. towns. Garden planting can start around January 19; autumn frost returns near December 10.
A year in Mountain House at a glance
Each month’s typical high and low, and what it brings.
What stands out about Mountain House’s climate
Compared with towns across the U.S., with Mountain House’s place in California beside it.
What a year in Mountain House feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 330 frost-free days a year
In half of years the last 32° night comes by January 19 and the first by December 10. Frost and day counts come from NOAA’s station at Tracy Pumping Plt, CA, 2.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Mountain House’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 27°. 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 11 inches of rain a year
January is the wettest month and July the driest. Rain falls on about 61 days a year. Snow is rare: about 0.0" in a normal year at Tracy Pumping Plt, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Mountain House
57% of the work is heating. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Tracy Pumping Plt, CA.
Living with Mountain House’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
330 frost-free days in zone 9b. The last frost comes by Jan 19 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 10.
Months with highs of 62–84° and lows of 40° or more: February, March, April, May, October and November. 7.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Mountain House from natural hazards, river flooding is the largest share (48%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Mountain House and similar climates
TownRatings has no climate map of the towns around Mountain House yet.
Climates most like Mountain House’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 |
|---|---|---|---|---|
| Mountain House, CA | 40° | 92° | 11" | 0.0" |
| Sierra Vista, AZ | 32° | 91° | 14" | 0.4" |
| Fort Stockton, TX | 33° | 96° | 13" | 1.4" |
| Chaparral, NM | 31° | 95° | 9" | 0.0" |
| Ashland, OR | 31° | 91° | 19" | 0.5" |
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 Mountain House averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.2°).
A bigger shift than in 62% 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 Mountain House compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Mountain House’s place among California’s.
Mountain House weather by month
Highs, lows and precipitation from NOAA’s grid at Mountain House’s center; snow, wet days and snow on the ground from Tracy Pumping Plt, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 57° | 40° | 2.1" | 0.0" | 13 | 0 | 44° – 53° |
| February | 63° | 43° | 1.8" | 0.0" | 10 | 0 | 49° – 57° |
| March | 68° | 45° | 1.5" | 0.0" | 8 | 0 | 51° – 62° |
| April | 73° | 48° | 0.8" | 0.0" | 5 | 0 | 56° – 64° |
| May | 80° | 53° | 0.4" | 0.0" | 3 | 0 | 60° – 74° |
| June | 87° | 57° | 0.1" | 0.0" | 1 | 0 | 68° – 75° |
| July | 92° | 60° | 0.0" | 0.0" | 0 | 0 | 72° – 80° |
| August | 91° | 59° | 0.0" | 0.0" | 0 | 0 | 72° – 80° |
| September | 88° | 57° | 0.1" | 0.0" | 1 | 0 | 69° – 76° |
| October | 79° | 51° | 0.6" | 0.0" | 3 | 0 | 62° – 70° |
| November | 66° | 44° | 1.1" | 0.0" | 7 | 0 | 50° – 60° |
| December | 57° | 39° | 2.0" | 0.0" | 12 | 0 | 45° – 53° |
| Year | 75° | 50° | 10.5" | 0.0" | 61 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 60° to 74°. September is the most reliable, staying within 7°.
Where Mountain House’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 Mountain House’s center.
- Snow: Tracy Pumping Plt, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Tracy Pumping Plt, CA, 2.7 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 Mountain House’s climate
What is the weather like in Mountain House?
A typical July afternoon reaches 92°, a January night drops to 40°, and snow is almost unheard of. Milder January nights than 88% of U.S. towns; hotter July afternoons than 87% of U.S. towns.
How cold does it get in Mountain House in winter?
December nights average 39°. About 10 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 45°.
How much snow does Mountain House get?
About 0.0 inches in a normal winter at Tracy Pumping Plt, CA, so most winters see none.
How hot does it get in Mountain House?
July, with a typical high of 92° and a low of 60°. About 82 days a year reach 90° and 17 reach 100° (Tracy Pumping Plt, CA).
When is the first and last frost in Mountain House?
In half of years the last spring frost (32°) comes by January 19 and the first fall frost by December 10, about 330 frost-free days, at Tracy Pumping Plt, CA.
What growing zone is Mountain House in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 27°.
What is the best time of year to visit Mountain House?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Mountain House getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 62% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Mountain House.
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.