Riggins, 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 Riggins's primary NOAA station, RIGGINS.
The climate verdict for Riggins
Dryness leads the climate profile for Riggins, Idaho, with 17.4 inches of precipitation a year. NOAA records an annual average of 50°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.
- 50°F
- average temperature, NOAA 1991-2020 normal
- 54/100
- comfort score, above 31% of station-mapped location scores
- 17.4"
- annual precipitation · 7" snow
- 156 days
- growing season, frost-free days
Riggins: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00107706 · Riggins, ID 50°F mean · 17.4" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 50°F
- RANK-MID #2,813
- PHOTO-FINISH ≈ Grand Canyon E…
- PRCP-DRY 17.4"
- SWING-MID 39°F
- COMF-LOW 54/100
- LOAD-HEAT 5,907 HDD
- STN-1 USC00107706
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Grand Canyon E Entrance, AZ (+ 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.
- Riggins (this station) 50°F
- Cold Gallup Sand & G…, NM 50°F
- Hot Boulder, UT 50°F
- Near Grand Canyon E…, AZ 50°F
- Near Westhamptn Gabr…, NY 50°F
Climate Living Index · Riggins
Riggins: 38/100 · grade F
Riggins publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Riggins, not an official NOAA rating. Rankings still use Comfort Score 54/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 7.1 inches/year | 68/100 · C |
| Annual temperature balance | 50.2°F · 17.3° from 67.5°F | 41/100 · D |
| Precipitation balance | 17.4 in · 17.6 from 35 in | 37/100 · F |
| Frost-free season | 156 days/year | 30/100 · F |
| Normal heat + freeze calendar | 179 calendar days | 26/100 · F |
Riggins · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Riggins is a temperate Köppen climate: Cfb
Coldest-month mean 32.0°F and warmest-month mean 71.1°F place this station in temperate, no dry season, warm summer climates (Cfb). Class Cfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, warm summer.
- Köppen code
- Cfb
- Group
- Temperate
- Warmest month
- 71.1°F
- Coldest month
- 32.0°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 Riggins sits across the climate record
Three NOAA fields for Riggins's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 41st percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 77%
- Riggins's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 31st percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Riggins compares across U.S. station-mapped locations
Riggins'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
Riggins's measured station temperature trend
MethodologyAcross 42 complete annual observations from 1897 to 2025, RIGGINS changed little at a fitted rate of 0.00°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Riggins primary station fitted change +0.00 °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 | 41°F (5°C) | 25°F (-4°C) | 33°F (0°C) | 1.3" | 2.1" | 20.6 | 0.0 |
| February | 46°F (8°C) | 26°F (-4°C) | 36°F (2°C) | 1.4" | 2.3" | 17.6 | 0.0 |
| March | 55°F (13°C) | 30°F (-1°C) | 43°F (6°C) | 1.8" | 0.1" | 11.6 | 0.0 |
| April | 62°F (17°C) | 35°F (1°C) | 48°F (9°C) | 2.0" | 0.0" | 4.3 | 0.2 |
| May | 71°F (22°C) | 41°F (5°C) | 56°F (13°C) | 2.2" | 0.0" | 0.4 | 2.4 |
| June | 78°F (25°C) | 47°F (8°C) | 62°F (17°C) | 1.7" | 0.0" | 0.0 | 6.0 |
| July | 90°F (32°C) | 52°F (11°C) | 71°F (22°C) | 0.8" | 0.0" | 0.0 | 20.1 |
| August | 90°F (32°C) | 52°F (11°C) | 71°F (22°C) | 0.7" | 0.0" | 0.0 | 20.4 |
| September | 80°F (26°C) | 45°F (7°C) | 62°F (17°C) | 1.2" | 0.0" | 0.1 | 7.6 |
| October | 64°F (18°C) | 36°F (2°C) | 50°F (10°C) | 1.5" | 0.0" | 3.7 | 0.4 |
| November | 48°F (9°C) | 29°F (-2°C) | 39°F (4°C) | 1.4" | 0.6" | 12.9 | 0.0 |
| December | 40°F (4°C) | 25°F (-4°C) | 32°F (0°C) | 1.4" | 2.0" | 20.8 | 0.0 |
The year, day by day
Riggins works both ends of the calendar. Normal highs climb to 93°F by July 29 and hold at or above 90°F on 34 dates, then normal lows drop to freezing or below on 145 dates, bottoming at 24°F around December 22.
When the heat sits
Normal highs reach 90°F from July 15 through August 17, covering 34 dates. The broader mild season, normal highs of 70°F or more, runs May 12 to October 4.
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 25, then returns to freezing around November 2, covering 145 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 April 10, when 46% of years recorded at least a hundredth of an inch. The driest is July 31 at 14%. Summed across the calendar, that is about 115 wet dates a year.
The widest day
July 27 carries the biggest normal gap between afternoon and dawn, 39°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Riggins.
Where Riggins Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 39°F, sharper than nine in ten ranked stations see.
Riggins 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: 2.1"
11.5 days with precipitation
Snow: 2.3"
9.6 days with precipitation
Snow: 0.1"
12.7 days with precipitation
13.5 days with precipitation
12.5 days with precipitation
10.2 days with precipitation
4.6 days with precipitation
4.3 days with precipitation
5.2 days with precipitation
8.3 days with precipitation
Snow: 0.6"
11.5 days with precipitation
Snow: 2.0"
11.7 days with precipitation
Riggins spreads its precipitation across the year
Neither half of the year dominates here: June through August take 18% of the annual total and December through February 24%, with neither reaching the 35% that would mark a distinct wet season. Riggins has no dry season to plan around, though it does carry a 39.1°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 2.2" and August 0.7". The three wettest months together take 34% 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.
Riggins is dry, and what does fall arrives gently
Only about 116 days a year record measurable precipitation here, 32% of the calendar, and they carry 17.4" between them. At roughly 0.15 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 April at about 14 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.
Snow reaches Riggins, but rarely amounts to much
The normals record 7.1 inches of snow a year here, most likely in February. 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 4 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 9
50% probability date
Last Spring Freeze
May 6
50% probability date
Growing Season
156 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,907
Higher = more heating needed
Cooling Degree Days
552
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside ID closest to Riggins 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 (50°F here).
- Ainsworth, NE 50°F · 0.0°F off
- Aurora, IL 50°F · 0.0°F off
- Blair, NE 50°F · 0.0°F off
- Bloomington, IL 50°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (17.4" here), excluding temperature-peer places.
- Medora, ND 17.4" · 0.0" off
- Estes Park, CO 17.4" · 0.0" off
- Fort Bidwell, CA 17.5" · 0.0" off
- La Grande, OR 17.4" · 0.0" off
Data-derived climate profile
How Riggins's climate pattern fits together
heating led · dry · mid swing
Riggins's energy balance leans toward cold weather: 5,907 annual heating degree days against 552 for cooling. Its 39.1°F seasonal range still makes the monthly rows more useful than the annual average alone.
Riggins's frost-free season lasts about 156 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and December mark the typical warm and cold ends of the calendar in Riggins's middle-range seasonal profile. The measured spread is 39.1°F. The annual average is 50°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Riggins's cold-season load does not imply a wet climate. Annual precipitation is 17.4 inches, which places the station in PlainClimate's dry range. Annual snowfall totals 7.1 inches. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
These labels group NOAA 1991-2020 normals from Riggins'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 Riggins, not an official NOAA class or a year-ahead forecast.
Questions about Riggins's climate
How much rain does Riggins get? ▼
How many days above 90°F does Riggins get? ▼
How much energy does heating and cooling require in Riggins? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Riggins's primary station: RIGGINS (USC00107706). 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 1667870). Match rule for Riggins: 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 Riggins 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.