Swan Valley, ID 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 Swan Valley's primary NOAA station, SWAN VALLEY.
The climate verdict for Swan Valley
Swan Valley, Idaho has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 43°F. July is the warmest month at 65°F and January the coldest at 21°F.
- 43°F
- yearly average temperature, NOAA normal
- 20.1"
- yearly precipitation total
Swan Valley: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00108937 · Swan Valley, ID 43°F mean · 20.1" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 43°F
- RANK-COOL #755
- PHOTO-FINISH ≈ Boulder
- PRCP-DRY 20.1"
- SWING-MID 45°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 8,297 HDD
- STN-1 USC00108937
- BOOK-FULL 5/6 fields
Nearest mean-temperature peer: Boulder, MT (+ 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 ID station list.
- Swan Valley (this station) 43°F
- Cold Peru, VT 43°F
- Hot Gorham, NH 43°F
- Near Boulder, MT 43°F
- Near Alder, MT 43°F
Climate Living Index · Swan Valley
Swan Valley: 18/100 · grade F
Swan Valley publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Swan Valley, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 20.1 in · 14.9 from 35 in | 47/100 · D |
| Annual temperature balance | 42.6°F · 24.9° from 67.5°F | 11/100 · F |
| Normal heat + freeze calendar | 215 calendar days | 7/100 · F |
Swan Valley · 2026-08-04 · NOAA NCEI Climate Normals · method .
Swan Valley is a continental Köppen climate: Dfb
Coldest-month mean 20.7°F and warmest-month mean 65.3°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 65.3°F
- Coldest month
- 20.7°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 Swan Valley sits across the climate record
Three NOAA fields for Swan Valley's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 89%
- Among 6,861 stations, Swan Valley sits in the cooler third of annual means.
- Annual precipitation
- Drier than 72%
- Swan Valley's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 56th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
Swan Valley's measured station temperature trend
MethodologyAcross 42 complete annual observations from 1961 to 2025, SWAN VALLEY warmed at a fitted rate of 0.20°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Swan Valley primary station fitted change +0.19 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 30°F (-1°C) | 11°F (-12°C) | 21°F (-6°C) | 1.9" | 30.3 | 0.0 |
| February | 35°F (2°C) | 14°F (-10°C) | 24°F (-4°C) | 1.3" | 26.5 | 0.0 |
| March | 45°F (7°C) | 22°F (-6°C) | 33°F (1°C) | 1.5" | 27.0 | 0.0 |
| April | 56°F (13°C) | 27°F (-3°C) | 42°F (5°C) | 1.9" | 21.2 | 0.0 |
| May | 66°F (19°C) | 35°F (1°C) | 50°F (10°C) | 2.5" | 9.5 | 0.0 |
| June | 75°F (24°C) | 41°F (5°C) | 58°F (14°C) | 2.1" | 2.0 | 0.9 |
| July | 85°F (29°C) | 46°F (8°C) | 65°F (19°C) | 1.3" | 0.1 | 6.7 |
| August | 84°F (29°C) | 44°F (7°C) | 64°F (18°C) | 1.3" | 0.6 | 5.2 |
| September | 75°F (24°C) | 37°F (3°C) | 56°F (13°C) | 1.6" | 5.7 | 0.7 |
| October | 59°F (15°C) | 29°F (-2°C) | 44°F (7°C) | 1.8" | 19.1 | 0.0 |
| November | 43°F (6°C) | 20°F (-6°C) | 32°F (0°C) | 1.6" | 26.3 | 0.0 |
| December | 32°F (0°C) | 12°F (-11°C) | 22°F (-6°C) | 1.4" | 29.6 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 87°F around July 26, short of 90°F on every date, while 215 dates carry a normal low at or below freezing, the coldest 11°F near January 1.
The freezing stretch
The normal low stays at or below 32°F into May 6, then returns to freezing around October 5, covering 215 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 May 23, when 43% of years recorded at least a hundredth of an inch. The driest is August 27 at 24%. Summed across the calendar, that is about 114 wet dates a year.
The widest day
August 8 carries the biggest normal gap between afternoon and dawn, 40°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Swan Valley.
Where Swan Valley Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 215 nights a year, placing this among the most frost-prone tenth of ranked stations.
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 40°F, sharper than nine in ten ranked stations see.
Swan Valley earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
9.9 days with precipitation
8.9 days with precipitation
10.2 days with precipitation
12.1 days with precipitation
13.0 days with precipitation
10.1 days with precipitation
7.9 days with precipitation
7.8 days with precipitation
7.6 days with precipitation
8.3 days with precipitation
8.5 days with precipitation
9.3 days with precipitation
Swan Valley spreads its precipitation across the year
Neither half of the year dominates here: June through August take 23% of the annual total and December through February 23%, with neither reaching the 35% that would mark a distinct wet season. Swan Valley has no dry season to plan around, though it does carry a 44.6°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 2.5" and August 1.3". The three wettest months together take 32% 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.
Swan Valley is dry, and what does fall arrives gently
Only about 114 days a year record measurable precipitation here, 31% of the calendar, and they carry 20.1" between them. At roughly 0.18 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 May at about 13 wet days; the driest is September at about 8.
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.
Frost Dates & Growing Season
First Fall Freeze
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,297
Higher = more heating needed
Cooling Degree Days
152
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside ID closest to Swan Valley 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 (43°F here).
- Alamosa, CO 43°F · 0.0°F off
- Baldwin, WI 43°F · 0.0°F off
- Boulder, MT 43°F · 0.0°F off
- Center, ND 43°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (20.1" here), excluding temperature-peer places.
- Clovis, NM 20.1" · 0.0" off
- McLaughlin, SD 20.1" · 0.0" off
- Pasadena, CA 20.1" · 0.0" off
- McCook, NE 20.1" · 0.0" off
Data-derived climate profile
How Swan Valley's climate pattern fits together
heating led · moderate · mid swing
Swan Valley's energy balance leans toward cold weather: 8,297 annual heating degree days against 152 for cooling. Its 44.6°F seasonal range still makes the monthly rows more useful than the annual average alone.
A frost-free growing-season length is not available for Swan Valley. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
July and January mark the typical warm and cold ends of the calendar in Swan Valley's middle-range seasonal profile. The measured spread is 44.6°F. The annual average is 43°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Swan Valley's 20.1 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Swan Valley's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Swan Valley, not an official NOAA class or a year-ahead forecast.
Questions about Swan Valley's climate
How much rain does Swan Valley get? ▼
How cold does Swan Valley get in winter? ▼
How much energy does heating and cooling require in Swan Valley? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Swan Valley's primary station: SWAN VALLEY (USC00108937). 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 1679120). Match rule for Swan Valley: 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 Swan Valley 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.