Swan Falls Powerhouse, ID Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Swan Falls Powerhouse's primary NOAA station, SWAN FALLS PH.
The climate verdict for Swan Falls Powerhouse
Dryness leads the climate profile for Swan Falls Powerhouse, Idaho, with 7.9 inches of precipitation a year. NOAA records an annual average of 55°F. Its climate comfort score of 56/100 (moderate) lands mid-pack nationally, exceeding 36% of station-mapped location scores.
- 55°F
- annual average temperature (NOAA normal)
- 56/100
- comfort score, above 36% of station-mapped location scores
- 7.9"
- yearly precipitation total
- 197 days
- frost-free days per growing season
Swan Falls Powerhouse: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00108928 · Swan Falls Powerhouse, ID 55°F mean · 7.9" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-ARID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 55°F
- RANK-UPPER #4,185
- PHOTO-FINISH ≈ Sparta
- PRCP-ARID 7.9"
- SWING-WIDE 46°F
- COMF-MID 56/100
- LOAD-HEAT 4,826 HDD
- STN-1 USC00108928
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Sparta, IL ( -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 ID station list.
- Swan Falls Powe… (this station) 55°F
- Cold Buffalo, MO 55°F
- Near Sparta, IL 55°F
- Near Palestine, IL 55°F
- Near Nashville, IL 55°F
Climate Living Index · Swan Falls Powerhouse
Swan Falls Powerhouse: 41/100 · grade D
Swan Falls Powerhouse publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Swan Falls Powerhouse, not an official NOAA rating. Rankings still use Comfort Score 56/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 197 days/year | 62/100 · C |
| Annual temperature balance | 55.2°F · 12.3° from 67.5°F | 60/100 · C |
| Normal heat + freeze calendar | 166 calendar days | 35/100 · F |
| Precipitation balance | 7.9 in · 27.1 from 35 in | 7/100 · F |
Swan Falls Powerhouse · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Swan Falls Powerhouse'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
- 79.8°F
- Coldest month
- 33.6°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 Falls Powerhouse sits across the climate record
Three NOAA fields for Swan Falls Powerhouse's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 61st percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 97%
- Swan Falls Powerhouse's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 65th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Swan Falls Powerhouse compares across U.S. station-mapped locations
Swan Falls Powerhouse's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
56 36th percentile score exceeds 36% 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
Swan Falls Powerhouse's measured station temperature trend
MethodologyAcross 67 complete annual observations from 1937 to 2025, SWAN FALLS PH warmed at a fitted rate of 0.07°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Swan Falls Powerhouse primary station fitted change +0.07 °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 | 42°F (5°C) | 26°F (-4°C) | 34°F (1°C) | 0.9" | 25.0 | 0.0 |
| February | 49°F (9°C) | 29°F (-2°C) | 39°F (4°C) | 0.6" | 18.5 | 0.0 |
| March | 59°F (15°C) | 36°F (2°C) | 47°F (8°C) | 0.8" | 8.4 | 0.0 |
| April | 66°F (19°C) | 41°F (5°C) | 53°F (12°C) | 0.8" | 2.5 | 0.2 |
| May | 75°F (24°C) | 50°F (10°C) | 62°F (17°C) | 1.3" | 0.2 | 3.0 |
| June | 84°F (29°C) | 57°F (14°C) | 71°F (21°C) | 0.6" | 0.1 | 10.0 |
| July | 95°F (35°C) | 65°F (18°C) | 80°F (27°C) | 0.2" | 0.0 | 24.4 |
| August | 93°F (34°C) | 63°F (17°C) | 78°F (26°C) | 0.2" | 0.0 | 23.7 |
| September | 83°F (28°C) | 53°F (12°C) | 68°F (20°C) | 0.3" | 0.1 | 8.2 |
| October | 68°F (20°C) | 42°F (5°C) | 55°F (13°C) | 0.6" | 2.3 | 0.3 |
| November | 52°F (11°C) | 31°F (0°C) | 42°F (5°C) | 0.8" | 14.7 | 0.0 |
| December | 42°F (5°C) | 26°F (-4°C) | 34°F (1°C) | 0.9" | 24.7 | 0.0 |
The year, day by day
Swan Falls Powerhouse works both ends of the calendar. Normal highs climb to 97°F by July 27 and hold at or above 90°F on 59 dates, then normal lows drop to freezing or below on 107 dates, bottoming at 25°F around January 1.
When the heat sits
Normal highs reach 90°F from July 1 through August 28, covering 59 dates. The broader mild season, normal highs of 70°F or more, runs April 30 to October 12.
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 February 26, then returns to freezing around November 12, covering 107 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 29% of years recorded at least a hundredth of an inch. The driest is August 16 at 5%. Summed across the calendar, that is about 72 wet dates a year.
The widest day
August 26 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Swan Falls Powerhouse.
Where Swan Falls Powerhouse Stands Nationally
Aridity defines the water calendar: about 8 inches in a normal year lands this among the driest tenth of ranked stations.
Swan Falls Powerhouse 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
9.0 days with precipitation
6.9 days with precipitation
8.0 days with precipitation
8.3 days with precipitation
8.1 days with precipitation
5.0 days with precipitation
1.6 days with precipitation
1.6 days with precipitation
2.4 days with precipitation
4.8 days with precipitation
7.4 days with precipitation
8.8 days with precipitation
Swan Falls Powerhouse 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 30%, with neither reaching the 35% that would mark a distinct wet season. Swan Falls Powerhouse has no dry season to plan around, though it does carry a wide 46.2°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 1.3" and August 0.2". The three wettest months together take 39% 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 Falls Powerhouse is dry, and what does fall arrives gently
Only about 72 days a year record measurable precipitation here, 20% of the calendar, and they carry 7.9" 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 9 wet days; the driest is July 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.
Frost Dates & Growing Season
First Fall Freeze
October 26
50% probability date
Last Spring Freeze
April 12
50% probability date
Growing Season
197 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,826
Higher = more heating needed
Cooling Degree Days
1,283
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside ID closest to Swan Falls Powerhouse 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 (55°F here).
- Augusta, KY 55°F · 0.0°F off
- Ava, MO 55°F · 0.0°F off
- Brandenburg, KY 55°F · 0.0°F off
- Brevard, NC 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (7.9" here), excluding temperature-peer places.
- Casa Grande, AZ 7.9" · 0.0" off
- Arizona City, AZ 8.0" · 0.0" off
- Kennewick, WA 7.9" · 0.0" off
- Hesperia, CA 7.8" · 0.1" off
Scarce-water calendar
Where Swan Falls Powerhouse's limited precipitation lands
heating led · dry · mid swing
Swan Falls Powerhouse's energy balance leans toward cold weather: 4,826 annual heating degree days against 1,283 for cooling. Its 46.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Swan Falls Powerhouse's frost-free season lasts about 197 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 Swan Falls Powerhouse's middle-range seasonal profile. The measured spread is 46.2°F. The annual average is 55°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Swan Falls Powerhouse's cold-season load does not imply a wet climate. Annual precipitation is 7.9 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
Swan Falls Powerhouse wettest normal
May
May concentrates the scarce annual total (7.9 inches).
Swan Falls Powerhouse driest normal
July
July is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Swan Falls Powerhouse's climate
How dry is Swan Falls Powerhouse? ▼
How many days above 90°F does Swan Falls Powerhouse get? ▼
How much energy does heating and cooling require in Swan Falls Powerhouse? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Swan Falls Powerhouse's primary station: SWAN FALLS PH (USC00108928). 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 Swan Falls Powerhouse; 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 Swan Falls Powerhouse 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.