Boundary Dam, WA Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Boundary Dam's primary NOAA station, BOUNDARY DAM.
The climate verdict for Boundary Dam
Boundary Dam, Washington has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 46°F. At 54/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 31% of scores.
- 46°F
- average temperature, NOAA 1991-2020 normal
- 54/100
- comfort score, above 31% of station-mapped location scores
- 28.2"
- annual precipitation · 55" snow
- 153 days
- growing season, frost-free days
Boundary Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00450844 · Boundary Dam, WA 46°F mean · 28.2" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,578
- PHOTO-FINISH ≈ Cooksburg
- PRCP-MID 28.2"
- SWING-MID 41°F
- COMF-LOW 54/100
- LOAD-HEAT 7,184 HDD
- STN-1 USC00450844
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Cooksburg, PA (+ 0 °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.
- Boundary Dam (this station) 46°F
- Hot Buckhorn Mtn, CO 46°F
- Near Cooksburg, PA 46°F
- Near Ely Yelland Fld, NV 46°F
- Near Eden-liberty, UT 46°F
Climate Living Index · Boundary Dam
Boundary Dam: 35/100 · grade F
Boundary Dam publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Boundary Dam, not an official NOAA rating. Rankings still use Comfort Score 54/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 28.2 in · 6.8 from 35 in | 76/100 · B |
| Normal heat + freeze calendar | 169 calendar days | 33/100 · F |
| Frost-free season | 153 days/year | 28/100 · F |
| Annual temperature balance | 46.0°F · 21.5° from 67.5°F | 23/100 · F |
| Snowfall burden | 54.8 inches/year | 18/100 · F |
Boundary Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Boundary Dam is a continental Köppen climate: Dsb
Coldest-month mean 26.7°F and warmest-month mean 67.8°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
- 67.8°F
- Coldest month
- 26.7°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 Boundary Dam sits across the climate record
Three NOAA fields for Boundary Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 77%
- Among 6,861 stations, Boundary Dam sits in the cooler third of annual means.
- Annual precipitation
- 38th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 40th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Boundary Dam compares across U.S. station-mapped locations
Boundary Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
54 31st percentile score exceeds 31% 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%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 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
Boundary Dam's measured station temperature trend
MethodologyAcross 33 complete annual observations from 1976 to 2025, BOUNDARY DAM warmed at a fitted rate of 0.26°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Boundary Dam primary station fitted change +0.26 °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 | 33°F (0°C) | 21°F (-6°C) | 27°F (-3°C) | 3.1" | 18.5" | 30.9 | 0.0 |
| February | 38°F (3°C) | 22°F (-6°C) | 30°F (-1°C) | 2.0" | 7.7" | 27.2 | 0.0 |
| March | 48°F (9°C) | 27°F (-3°C) | 37°F (3°C) | 2.4" | 3.4" | 28.0 | 0.0 |
| April | 58°F (14°C) | 33°F (0°C) | 45°F (7°C) | 2.2" | 0.1" | 16.4 | 0.0 |
| May | 67°F (20°C) | 41°F (5°C) | 54°F (12°C) | 2.6" | 0.0" | 2.9 | 0.3 |
| June | 72°F (22°C) | 48°F (9°C) | 60°F (16°C) | 3.2" | 0.0" | 0.0 | 1.5 |
| July | 84°F (29°C) | 52°F (11°C) | 68°F (20°C) | 1.4" | 0.0" | 0.0 | 9.0 |
| August | 85°F (29°C) | 50°F (10°C) | 67°F (20°C) | 0.8" | 0.0" | 0.0 | 9.7 |
| September | 73°F (23°C) | 43°F (6°C) | 58°F (14°C) | 1.3" | 0.0" | 2.2 | 1.2 |
| October | 56°F (13°C) | 35°F (1°C) | 45°F (7°C) | 2.4" | 0.1" | 12.9 | 0.0 |
| November | 40°F (5°C) | 28°F (-2°C) | 34°F (1°C) | 3.2" | 6.8" | 23.1 | 0.0 |
| December | 32°F (0°C) | 21°F (-6°C) | 27°F (-3°C) | 3.6" | 18.2" | 30.2 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 88°F around July 31, short of 90°F on every date, while 169 dates carry a normal low at or below freezing, the coldest 20°F near December 26.
The freezing stretch
The normal low stays at or below 32°F into April 13, then returns to freezing around October 28, covering 169 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 51% of years recorded at least a hundredth of an inch. The driest is August 5 at 17%. Summed across the calendar, that is about 141 wet dates a year.
The widest day
August 8 carries the biggest normal gap between afternoon and dawn, 36°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Boundary Dam.
Where Boundary Dam Stands Nationally
Daily temperature swings run wider than most of the country, peaking near 36°F between the normal high and low.
Boundary Dam earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 18.5"
15.3 days with precipitation
Snow: 7.7"
11.0 days with precipitation
Snow: 3.4"
12.0 days with precipitation
Snow: 0.1"
12.6 days with precipitation
12.7 days with precipitation
13.5 days with precipitation
7.4 days with precipitation
5.3 days with precipitation
7.9 days with precipitation
Snow: 0.1"
12.4 days with precipitation
Snow: 6.8"
15.4 days with precipitation
Snow: 18.2"
15.7 days with precipitation
Boundary Dam spreads its precipitation across the year
Neither half of the year dominates here: June through August take 19% of the annual total and December through February 31%, with neither reaching the 35% that would mark a distinct wet season. Boundary Dam has no dry season to plan around, though it does carry a 41.1°F seasonal spread.
The gap between the wettest and driest month still matters: December averages 3.6" and August 0.8". The three wettest months together take 35% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
Rain reaches Boundary Dam in small, frequent amounts
Boundary Dam records about 141 days with measurable precipitation a year and 28.2" in total, which works out to roughly 0.20 inches on an average wet day. Precipitation on 39% of all days, arriving that lightly, is the damp many-grey-days pattern rather than the storm-driven one.
Places in this band read as wetter than their annual totals suggest, because what people notice is the number of overcast days, not the depth in the gauge.
- Most wet days: December, about 16 of them.
- Fewest: August, about 5.
- Average depth per wet day: 0.20 inches.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Boundary Dam
Boundary Dam averages 54.8 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 32 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: 54.8 inches of depth.
- Days recording measurable snow: about 32 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 19% 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
October 4
50% probability date
Last Spring Freeze
May 4
50% probability date
Growing Season
153 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,184
Higher = more heating needed
Cooling Degree Days
289
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WA closest to Boundary Dam 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).
- Algona, IA 46°F · 0.0°F off
- Arlington, WI 46°F · 0.0°F off
- Eau Claire, WI 46°F · 0.0°F off
- Glenbrook, NV 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (28.2" here), excluding temperature-peer places.
- Harlingen, TX 28.2" · 0.0" off
- Madison, NE 28.2" · 0.0" off
- Geneva, NE 28.2" · 0.0" off
- Tower, MN 28.2" · 0.0" off
Snow and freeze rhythm
When cold and snow define Boundary Dam
heating led · moderate · mid swing
Boundary Dam's energy balance leans toward cold weather: 7,184 annual heating degree days against 289 for cooling. Its 41.1°F seasonal range still makes the monthly rows more useful than the annual average alone.
Boundary Dam's frost-free season lasts about 153 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Boundary Dam coldest normal
January
The monthly mean of 27°F (-3°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Boundary Dam typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Boundary Dam snow peak
January
Boundary Dam averages 54.8 inches of snow a year, with January the snowiest month on the normals.
Questions about Boundary Dam's climate
How much snow does Boundary Dam get? ▼
How cold does Boundary Dam get in winter? ▼
How much energy does heating and cooling require in Boundary Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Boundary Dam's primary station: BOUNDARY DAM (USC00450844). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Boundary Dam; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Boundary Dam 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.