Photo: Ian Poellet · CC BY-SA 4.0Amboy’s winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 79°, a January night drops to 35°, and about 3 inches of snow falls in a normal winter.
A year in Amboy at a glance
Each month’s typical high and low, and what it brings.
What stands out about Amboy’s climate
Compared with towns across the U.S., with Amboy’s place in Washington beside it.
What a year in Amboy feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 174 frost-free days a year
In half of years the last 32° night comes by April 26 and the first by October 16. Frost and day counts come from NOAA’s station at Battle Ground, WA, 10 miles from the town’s center, 260 ft lower.
The 2023 USDA map puts Amboy’s center in zone 8a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 15°. 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 3 inches of snow a winter
Snow, measured at Merwin Dam, WA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 77 inches a year; December is the wettest month and July the driest. Rain or snow falls on about 176 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Amboy
97% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October 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 Battle Ground, WA.
Living with Amboy’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
174 frost-free days in zone 8a. The last frost comes by Apr 26 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 16.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 0.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Amboy from natural hazards, river flooding is the largest share (73%); heat waves, cold waves, winter storms and ice storms together are 13%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Amboy and similar climates
TownRatings has no climate map of the towns around Amboy yet.
Climates most like Amboy’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 |
|---|---|---|---|---|
| Amboy, WA | 35° | 79° | 77" | 3.0" |
| Brevard, NC | 27° | 83° | 69" | 7.1" |
| Signal Mountain, TN | 29° | 85° | 62" | 4.3" |
| Fort Payne, AL | 31° | 86° | 60" | 5.0" |
| Dahlonega, GA | 30° | 87° | 63" | 3.3" |
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 Amboy averaged 1.3° warmer than the 1900s. The biggest change is in January (+3.3°).
A smaller shift than in 53% 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 Amboy compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Amboy’s place among Washington’s.
Amboy weather by month
Highs, lows and precipitation from NOAA’s grid at Amboy’s center; snow, wet days and snow on the ground from Merwin Dam, WA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 45° | 35° | 11.0" | 1.6" | 21 | 1 | 34° – 45° |
| February | 49° | 35° | 8.2" | 0.9" | 18 | 1 | 36° – 48° |
| March | 54° | 37° | 8.1" | 0.2" | 20 | 0 | 42° – 51° |
| April | 59° | 40° | 6.5" | 0.0" | 19 | 0 | 45° – 54° |
| May | 66° | 45° | 4.3" | 0.0" | 14 | 0 | 51° – 60° |
| June | 71° | 49° | 3.1" | 0.0" | 11 | 0 | 56° – 67° |
| July | 79° | 54° | 0.8" | 0.0" | 4 | 0 | 60° – 70° |
| August | 79° | 53° | 1.1" | 0.0" | 4 | 0 | 63° – 70° |
| September | 73° | 50° | 2.9" | 0.0" | 9 | 0 | 58° – 64° |
| October | 61° | 43° | 7.2" | 0.0" | 15 | 0 | 48° – 57° |
| November | 50° | 38° | 11.4" | 0.0" | 20 | 0 | 39° – 49° |
| December | 44° | 34° | 11.9" | 0.3" | 21 | 0 | 35° – 42° |
| Year | 61° | 43° | 76.7" | 3.0" | 176 | 2 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 36° to 48°. September is the most reliable, staying within 6°.
Where Amboy’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 Amboy’s center.
- Snow: Merwin Dam, WA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Battle Ground, WA, 10 miles from the town’s center, 260 ft lower; 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 Amboy’s climate
What is the weather like in Amboy?
A typical July afternoon reaches 79°, a January night drops to 35°, and about 3 inches of snow falls in a normal winter. Milder January nights than 80% of U.S. towns; cooler July afternoons than 95% of U.S. towns.
How cold does it get in Amboy in winter?
December nights average 34°. About 70 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 35°.
How much snow does Amboy get?
About 3.0 inches in a normal winter at Merwin Dam, WA, most of it in January, with snow on the ground about 2 days a year.
How hot does it get in Amboy?
July, with a typical high of 79° and a low of 54°. About 11 days a year reach 90° (Battle Ground, WA).
When is the first and last frost in Amboy?
In half of years the last spring frost (32°) comes by April 26 and the first fall frost by October 16, about 174 frost-free days, at Battle Ground, WA.
What growing zone is Amboy in?
Zone 8a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 15°.
What is the best time of year to visit Amboy?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Amboy getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 53% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Amboy.
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.