Neil Cooney Mansion · Photo: Jon Roanhaus · CC BY-SA 3.0Cosmopolis’ winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 69°, a January night drops to 36°, and snow is almost unheard of.
A year in Cosmopolis at a glance
Each month’s typical high and low, and what it brings.
What stands out about Cosmopolis’ climate
Compared with towns across the U.S., with Cosmopolis’ place in Washington beside it.
What a year in Cosmopolis feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 234 frost-free days a year
In half of years the last 32° night comes by March 29 and the first by November 15. Frost and day counts come from NOAA’s station at Aberdeen, WA, 2.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Cosmopolis’ center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 20°. 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 81 inches of rain a year
November is the wettest month and July the driest. Rain falls on about 192 days a year. Snow is rare: about 0.5" in a normal year at Aberdeen, WA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Cosmopolis
99% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Aberdeen, WA.
Living with Cosmopolis’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
234 frost-free days in zone 8b. The last frost comes by Mar 29 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 15.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 1.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Cosmopolis from natural hazards, earthquakes are the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Cosmopolis and similar climates
TownRatings has no climate map of the towns around Cosmopolis yet.
Climates most like Cosmopolis’, 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 |
|---|---|---|---|---|
| Cosmopolis, WA | 36° | 69° | 81" | 0.5" |
| Brookings, OR | 42° | 69° | 73" | 0.0" |
| Crescent City, CA | 42° | 64° | 69" | 0.0" |
| Brevard, NC | 27° | 83° | 69" | 7.1" |
| Kodiak, AK | 26° | 62° | 78" | 70" |
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 Cosmopolis averaged 1.3° warmer than the 1900s. The biggest change is in January (+2.9°).
A smaller shift than in 57% 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 Cosmopolis compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Cosmopolis’ place among Washington’s.
Cosmopolis weather by month
Highs, lows and precipitation from NOAA’s grid at Cosmopolis’ center; snow, wet days and snow on the ground from Aberdeen, WA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 48° | 36° | 13.0" | 0.0" | 22 | 0 | 37° – 46° |
| February | 50° | 35° | 8.1" | 0.1" | 19 | 0 | 37° – 49° |
| March | 53° | 37° | 9.2" | 0.2" | 22 | 0 | 42° – 50° |
| April | 57° | 39° | 6.1" | 0.0" | 19 | 0 | 44° – 53° |
| May | 62° | 45° | 3.4" | 0.0" | 14 | 0 | 50° – 57° |
| June | 66° | 49° | 2.4" | 0.0" | 12 | 0 | 54° – 60° |
| July | 69° | 52° | 0.9" | 0.0" | 7 | 0 | 58° – 64° |
| August | 71° | 52° | 1.6" | 0.0" | 7 | 0 | 59° – 64° |
| September | 69° | 48° | 2.9" | 0.0" | 9 | 0 | 56° – 62° |
| October | 60° | 43° | 8.1" | 0.0" | 18 | 0 | 49° – 57° |
| November | 52° | 38° | 13.0" | 0.2" | 22 | 0 | 41° – 50° |
| December | 47° | 36° | 12.5" | 0.0" | 23 | 0 | 37° – 44° |
| Year | 59° | 42° | 81.2" | 0.5" | 192 | 1 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 37° to 49°. August is the most reliable, staying within 5°.
Where Cosmopolis’ 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 Cosmopolis’ center.
- Snow: Aberdeen, WA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Aberdeen, WA, 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 Cosmopolis’ climate
What is the weather like in Cosmopolis?
A typical July afternoon reaches 69°, a January night drops to 36°, and snow is almost unheard of. Milder January nights than 83% of U.S. towns; cooler July afternoons than all but 74 U.S. towns.
How cold does it get in Cosmopolis in winter?
February nights average 35°. About 35 nights a year reach 32° or below. In the coldest February of the last 30 years the month averaged 37°.
How much snow does Cosmopolis get?
About 0.5 inches in a normal winter at Aberdeen, WA, so most winters see none.
How hot does it get in Cosmopolis?
July, with a typical high of 69° and a low of 52°. About 2 days a year reach 90° (Aberdeen, WA).
When is the first and last frost in Cosmopolis?
In half of years the last spring frost (32°) comes by March 29 and the first fall frost by November 15, about 234 frost-free days, at Aberdeen, WA.
What growing zone is Cosmopolis in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 20°.
What is the best time of year to visit Cosmopolis?
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 Cosmopolis getting warmer?
Yes: 1991–2020 averaged 1.3° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 57% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Cosmopolis.
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.