Ice Harbor Dam, WA Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Ice Harbor Dam's primary NOAA station, ICE HARBOR DAM.
The climate verdict for Ice Harbor Dam
Dryness leads the climate profile for Ice Harbor Dam, Washington, with 11.1 inches of precipitation a year. NOAA records an annual average of 54°F. Its climate comfort score of 63/100 (good) lands mid-pack nationally, exceeding 46% of station-mapped location scores.
- 54°F
- yearly average temperature, NOAA normal
- 63/100
- comfort score, above 46% of station-mapped location scores
- 11.1"
- annual precipitation · 2" snow
- 198 days
- frost-free days per growing season
Ice Harbor Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00453883 · Ice Harbor Dam, WA 54°F mean · 11.1" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-ARID · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 54°F
- RANK-MID #3,911
- PHOTO-FINISH ≈ Grundy
- PRCP-ARID 11.1"
- SWING-MID 39°F
- COMF-MID 63/100
- LOAD-HEAT 4,780 HDD
- STN-1 USC00453883
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Grundy, VA (+ 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.
- Ice Harbor Dam (this station) 54°F
- Cold Saltville, VA 54°F
- Hot Mcnary Dam, WA 54°F
- Near Grundy, VA 54°F
- Near Mcnary Dam, OR 54°F
Climate Living Index · Ice Harbor Dam
Ice Harbor Dam: 54/100 · grade D
Ice Harbor 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 Ice Harbor Dam, not an official NOAA rating. Rankings still use Comfort Score 63/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 2.0 inches/year | 76/100 · B |
| Frost-free season | 198 days/year | 63/100 · C |
| Normal heat + freeze calendar | 123 calendar days | 63/100 · C |
| Annual temperature balance | 54.0°F · 13.5° from 67.5°F | 56/100 · C |
| Precipitation balance | 11.1 in · 23.9 from 35 in | 16/100 · F |
Ice Harbor Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Ice Harbor Dam's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 74.8°F
- Coldest month
- 35.4°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 Ice Harbor Dam sits across the climate record
Three NOAA fields for Ice Harbor Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 57th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 92%
- Ice Harbor Dam's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 33rd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Ice Harbor Dam compares across U.S. station-mapped locations
Ice Harbor Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 46th percentile score exceeds 46% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 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
Ice Harbor Dam's measured station temperature trend
MethodologyAcross 42 complete annual observations from 1958 to 2021, ICE HARBOR DAM changed little at a fitted rate of 0.01°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Ice Harbor Dam primary station fitted change +0.02 °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 | 42°F (5°C) | 29°F (-2°C) | 35°F (2°C) | 1.4" | 0.2" | 19.3 | 0.0 |
| February | 48°F (9°C) | 30°F (-1°C) | 39°F (4°C) | 1.0" | 0.2" | 17.3 | 0.0 |
| March | 58°F (14°C) | 35°F (2°C) | 46°F (8°C) | 1.0" | 0.1" | 9.7 | 0.0 |
| April | 65°F (18°C) | 41°F (5°C) | 53°F (12°C) | 1.0" | 0.0" | 2.1 | 0.0 |
| May | 74°F (23°C) | 48°F (9°C) | 61°F (16°C) | 1.1" | 0.0" | 0.2 | 1.0 |
| June | 80°F (27°C) | 54°F (12°C) | 67°F (20°C) | 0.8" | 0.0" | 0.0 | 3.4 |
| July | 89°F (32°C) | 61°F (16°C) | 75°F (24°C) | 0.3" | 0.0" | 0.0 | 15.3 |
| August | 89°F (31°C) | 59°F (15°C) | 74°F (23°C) | 0.3" | 0.0" | 0.0 | 14.3 |
| September | 80°F (27°C) | 51°F (11°C) | 66°F (19°C) | 0.4" | 0.0" | 0.1 | 3.0 |
| October | 66°F (19°C) | 42°F (6°C) | 54°F (12°C) | 1.0" | 0.0" | 3.4 | 0.0 |
| November | 51°F (11°C) | 35°F (1°C) | 43°F (6°C) | 1.3" | 0.1" | 11.8 | 0.0 |
| December | 42°F (6°C) | 29°F (-2°C) | 36°F (2°C) | 1.4" | 1.4" | 20.3 | 0.0 |
The year, day by day
Ice Harbor Dam works both ends of the calendar. Normal highs climb to 91°F by July 27 and hold at or above 90°F on 26 dates, then normal lows drop to freezing or below on 97 dates, bottoming at 28°F around January 1.
When the heat sits
Normal highs reach 90°F from July 17 through August 11, covering 26 dates. The broader mild season, normal highs of 70°F or more, runs May 3 to October 8.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into March 3, then returns to freezing around November 28, covering 97 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 January 7, when 45% of years recorded at least a hundredth of an inch. The driest is August 5 at 6%. Summed across the calendar, that is about 97 wet dates a year.
The widest day
September 1 carries the biggest normal gap between afternoon and dawn, 30°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Ice Harbor Dam.
Where Ice Harbor Dam Stands Nationally
Aridity defines the water calendar: about 11 inches in a normal year lands this among the driest tenth of ranked stations.
Ice Harbor 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: 0.2"
13.7 days with precipitation
Snow: 0.2"
10.2 days with precipitation
Snow: 0.1"
9.6 days with precipitation
8.8 days with precipitation
8.2 days with precipitation
5.6 days with precipitation
2.5 days with precipitation
1.9 days with precipitation
3.7 days with precipitation
8.2 days with precipitation
Snow: 0.1"
12.3 days with precipitation
Snow: 1.4"
12.7 days with precipitation
Ice Harbor Dam spreads its precipitation across the year
Neither half of the year dominates here: June through August take 13% of the annual total and December through February 35%, with neither reaching the 35% that would mark a distinct wet season. Ice Harbor Dam has no dry season to plan around, though it does carry a 39.4°F seasonal spread.
The gap between the wettest and driest month still matters: December averages 1.4" and July 0.3". The three wettest months together take 37% 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.
Ice Harbor Dam 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 11.1" between them. At roughly 0.11 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 January at about 14 wet days; the driest is August at about 2.
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.
Snow reaches Ice Harbor Dam, but rarely amounts to much
The normals record 2.0 inches of snow a year here, most likely in December. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 2 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
October 22
50% probability date
Last Spring Freeze
April 7
50% probability date
Growing Season
198 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,780
Higher = more heating needed
Cooling Degree Days
811
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WA closest to Ice Harbor 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 (54°F here).
- Boardman, OR 54°F · 0.0°F off
- Damascus, MD 54°F · 0.0°F off
- Elsberry, MO 54°F · 0.0°F off
- Estacada, OR 54°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (11.1" here), excluding temperature-peer places.
- Gildford, MT 11.1" · 0.0" off
- Alcalde, NM 11.1" · 0.0" off
- Klamath Falls, OR 11.1" · 0.0" off
- Dinosaur, CO 11.2" · 0.0" off
Scarce-water calendar
Where Ice Harbor Dam's limited precipitation lands
heating led · dry · mid swing
Ice Harbor Dam's energy balance leans toward cold weather: 4,780 annual heating degree days against 811 for cooling. Its 39.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
Ice Harbor Dam's frost-free season lasts about 198 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Ice Harbor Dam's middle-range seasonal profile. The measured spread is 39.4°F. The annual average is 54°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Ice Harbor Dam's cold-season load does not imply a wet climate. Annual precipitation is 11.1 inches, which places the station in PlainClimate's dry range. Annual snowfall totals 2.0 inches. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
Ice Harbor Dam wettest normal
December
December concentrates the scarce annual total (11.1 inches).
Ice Harbor Dam driest normal
July
July is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Ice Harbor Dam's climate
How dry is Ice Harbor Dam? ▼
How many days above 90°F does Ice Harbor Dam get? ▼
How much energy does heating and cooling require in Ice Harbor Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Ice Harbor Dam's primary station: ICE HARBOR DAM (USC00453883). 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 Ice Harbor 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 Ice Harbor 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.