Post Mountain sits near the top of U.S. towns for precipitation, with 57 inches a year
Expect July afternoons of about 90°. Only 59° separates winter nights from summer afternoons. Summer afternoons here are warmer than in 78% of U.S. towns. For walks and days out, May, June and October bring highs of 70–82°.
A year in Post Mountain at a glance
Each month’s typical high and low, and what it brings.
What stands out about Post Mountain’s climate
Compared with towns across the U.S., with Post Mountain’s place in California beside it.
What a year in Post Mountain feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 57 inches of rain a year
December is the wettest month and July the driest.
Rain + melted snow by month
Inches of water
Living with Post Mountain’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 8b.
Months with highs of 62–84° and lows of 40° or more: May, June and October. 20 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Post Mountain from natural hazards, river flooding is the largest share (48%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Post Mountain and similar climates
TownRatings has no climate map of the towns around Post Mountain 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 Post Mountain averaged 1.3° warmer than the 1900s. The biggest change is in January (+2.1°).
A smaller shift than in 55% 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 Post Mountain compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Post Mountain’s place among California’s.
Post Mountain weather by month
Highs, lows and precipitation from NOAA’s grid at Post Mountain’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 48° | 31° | 10.5" | 35° – 45° |
| February | 52° | 33° | 9.2" | 36° – 49° |
| March | 57° | 35° | 7.8" | 38° – 53° |
| April | 63° | 37° | 4.7" | 43° – 54° |
| May | 72° | 42° | 2.2" | 48° – 63° |
| June | 82° | 48° | 0.8" | 59° – 72° |
| July | 90° | 55° | 0.1" | 68° – 76° |
| August | 90° | 53° | 0.2" | 69° – 76° |
| September | 84° | 48° | 0.4" | 63° – 71° |
| October | 70° | 40° | 3.0" | 51° – 61° |
| November | 55° | 35° | 6.4" | 37° – 50° |
| December | 46° | 31° | 11.8" | 36° – 43° |
| Year | 67° | 41° | 56.9" |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 48° to 63°. December is the most reliable, staying within 7°.
Where Post Mountain’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 Post Mountain’s center.
- 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 Post Mountain’s climate
What is the weather like in Post Mountain?
A typical July afternoon reaches 90°, a January night drops to 31°. Milder January nights than 74% of U.S. towns; hotter July afternoons than 78% of U.S. towns.
How cold does it get in Post Mountain in winter?
December nights average 31°. In the coldest December of the last 30 years the month averaged 36°.
How hot does it get in Post Mountain?
July, with a typical high of 90°. 90° days are rare.
What growing zone is Post Mountain in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 16°.
What is the best time of year to visit Post Mountain?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Post Mountain getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 55% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Post Mountain.
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.