Winthrop, WA Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Winthrop's primary NOAA station, WINTHROP 1 WSW.
The climate verdict for Winthrop
Dryness leads the climate profile for Winthrop, Washington, with 15.2 inches of precipitation a year. NOAA records an annual average of 46°F. At 44/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 10% of scores.
- 46°F
- annual average temperature (NOAA normal)
- 44/100
- comfort score, above 10% of station-mapped location scores
- 15.2"
- annual precipitation · 59" snow
- 130 days
- frost-free growing season
Winthrop: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00459376 · Winthrop, WA 46°F mean · 15.2" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,509
- PHOTO-FINISH ≈ Port Allegany
- PRCP-DRY 15.2"
- SWING-WIDE 46°F
- COMF-LOW 44/100
- LOAD-HEAT 7,314 HDD
- STN-1 USC00459376
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Port Allegany, PA (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every WA station list.
- Winthrop (this station) 46°F
- Cold Wyoming, NY 46°F
- Hot Salamanca, NY 46°F
- Near Port Allegany, PA 46°F
- Near Wilbur, WA 46°F
Climate Living Index · Winthrop
Winthrop: 22/100 · grade F
Winthrop publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Winthrop, not an official NOAA rating. Rankings still use Comfort Score 44/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 15.2 in · 19.8 from 35 in | 29/100 · F |
| Normal heat + freeze calendar | 184 calendar days | 23/100 · F |
| Annual temperature balance | 45.7°F · 21.8° from 67.5°F | 22/100 · F |
| Snowfall burden | 59.4 inches/year | 16/100 · F |
| Frost-free season | 130 days/year | 12/100 · F |
Winthrop · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Winthrop is a continental Köppen climate: Dsb
Coldest-month mean 22.3°F and warmest-month mean 68.3°F place this station in continental, dry-summer, warm summer climates (Dsb). Class Dsb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, dry-summer, warm summer.
- Köppen code
- Dsb
- Group
- Continental
- Warmest month
- 68.3°F
- Coldest month
- 22.3°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Winthrop sits across the climate record
Three NOAA fields for Winthrop's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 78%
- Among 6,861 stations, Winthrop sits in the cooler third of annual means.
- Annual precipitation
- Drier than 82%
- Winthrop's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 64th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Winthrop compares across U.S. station-mapped locations
Winthrop's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
44 10th percentile score exceeds 10% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Winthrop's measured station temperature trend
MethodologyAcross 83 complete annual observations from 1912 to 2025, WINTHROP 1 WSW warmed at a fitted rate of 0.14°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Winthrop primary station fitted change +0.14 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 30°F (-1°C) | 15°F (-9°C) | 23°F (-5°C) | 2.1" | 16.6" | 30.4 | 0.0 |
| February | 38°F (4°C) | 18°F (-8°C) | 28°F (-2°C) | 1.3" | 8.8" | 26.4 | 0.0 |
| March | 50°F (10°C) | 25°F (-4°C) | 38°F (3°C) | 1.2" | 3.4" | 26.5 | 0.0 |
| April | 61°F (16°C) | 32°F (0°C) | 47°F (8°C) | 0.8" | 0.1" | 15.3 | 0.0 |
| May | 71°F (22°C) | 40°F (4°C) | 55°F (13°C) | 1.1" | 0.0" | 4.5 | 0.5 |
| June | 77°F (25°C) | 46°F (8°C) | 61°F (16°C) | 1.1" | 0.0" | 0.2 | 2.1 |
| July | 86°F (30°C) | 51°F (10°C) | 68°F (20°C) | 0.7" | 0.0" | 0.0 | 11.5 |
| August | 86°F (30°C) | 49°F (10°C) | 68°F (20°C) | 0.5" | 0.0" | 0.0 | 10.4 |
| September | 77°F (25°C) | 41°F (5°C) | 59°F (15°C) | 0.5" | 0.0" | 2.7 | 2.3 |
| October | 61°F (16°C) | 32°F (0°C) | 46°F (8°C) | 1.4" | 1.1" | 16.5 | 0.0 |
| November | 41°F (5°C) | 25°F (-4°C) | 33°F (0°C) | 2.0" | 7.6" | 23.9 | 0.0 |
| December | 29°F (-2°C) | 15°F (-9°C) | 22°F (-5°C) | 2.6" | 21.8" | 30.7 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 88°F around July 27, short of 90°F on every date, while 184 dates carry a normal low at or below freezing, the coldest 14°F near December 26.
The freezing stretch
The normal low stays at or below 32°F into April 15, then returns to freezing around October 15, covering 184 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is December 27, when 44% of years recorded at least a hundredth of an inch. The driest is August 20 at 12%. Summed across the calendar, that is about 97 wet dates a year.
The widest day
August 5 carries the biggest normal gap between afternoon and dawn, 37°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Winthrop.
Where Winthrop Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 37°F, sharper than nine in ten ranked stations see.
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 184 nights a year, more than most ranked stations.
Winthrop earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 16.6"
12.3 days with precipitation
Snow: 8.8"
8.7 days with precipitation
Snow: 3.4"
7.9 days with precipitation
Snow: 0.1"
6.5 days with precipitation
7.6 days with precipitation
7.3 days with precipitation
4.4 days with precipitation
3.8 days with precipitation
4.3 days with precipitation
Snow: 1.1"
8.5 days with precipitation
Snow: 7.6"
12.3 days with precipitation
Snow: 21.8"
13.3 days with precipitation
Winthrop's wet season runs through the cold months
December, January and February carry 39% of the year's precipitation here, while June through August contribute 15%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a wide 46°F gap between its warmest and coldest month.
- Wettest month
- December, 2.6"
- Driest month
- September, 0.5"
- Wettest three months
- December, January, November (44% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
Winthrop is dry, and what does fall arrives gently
Only about 97 days a year record measurable precipitation here, 27% of the calendar, and they carry 15.2" between them. At roughly 0.16 inches on an average wet day, this is not the damp drizzle of a marine climate; it is an arid record in which precipitation is both uncommon and light when it appears.
The wettest month by count is December at about 13 wet days; the driest is August at about 4.
A low per-event average in a dry record is a statement about typical days only. Arid regions can still take a large share of a year's total from a single convective storm, which a normal cannot show.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, not the extremes within it.
Winter brings real snow to Winthrop
Winthrop averages 59.4 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 34 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 59.4 inches of depth.
- Days recording measurable snow: about 34 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 39% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
September 22
50% probability date
Last Spring Freeze
May 15
50% probability date
Growing Season
130 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,314
Higher = more heating needed
Cooling Degree Days
302
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside WA closest to Winthrop on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (46°F here).
- Alpine, AZ 46°F · 0.0°F off
- Bison, SD 46°F · 0.0°F off
- Brunswick, ME 46°F · 0.0°F off
- Canton, SD 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (15.2" here), excluding temperature-peer places.
- Sisters, OR 15.2" · 0.0" off
- Gila Hot Springs, NM 15.2" · 0.0" off
- Longmont, CO 15.2" · 0.0" off
- White Signal, NM 15.2" · 0.0" off
Snow and freeze rhythm
When cold and snow define Winthrop
heating led · dry · mid swing
Winthrop's energy balance leans toward cold weather: 7,314 annual heating degree days against 302 for cooling. Its 46.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 130 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
-
1. Winthrop coldest normal
December
Averaging 22°F (-5°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Winthrop typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Winthrop snow peak
December
Winthrop averages 59.4 inches of snow a year, with December the snowiest month on the normals.
Questions about Winthrop's climate
How much snow does Winthrop get? ▼
How cold does Winthrop get in winter? ▼
How much energy does heating and cooling require in Winthrop? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Winthrop's primary station: WINTHROP 1 WSW (USC00459376). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 5379380). Match rule for Winthrop: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Winthrop comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.