Glenns Ferry, 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 Glenns Ferry's primary NOAA station, GLENNS FERRY.
The climate verdict for Glenns Ferry
Dryness leads the climate profile for Glenns Ferry, Idaho, with 10.6 inches of precipitation a year. NOAA records an annual average of 55°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 55°F
- yearly average temperature, NOAA normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 10.6"
- precipitation, annual total
- 155 days
- frost-free growing season
Glenns Ferry: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00103631 · Glenns Ferry, ID 55°F mean · 10.6" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-ARID · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 55°F
- RANK-MID #4,048
- PHOTO-FINISH ≈ Safe Harbor Dam
- PRCP-ARID 10.6"
- SWING-MID 45°F
- COMF-LOW 52/100
- LOAD-HEAT 4,934 HDD
- STN-1 USC00103631
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Safe Harbor Dam, 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 ID station list.
- Glenns Ferry (this station) 55°F
- Cold Fredericktown, MO 55°F
- Hot Potosi, MO 55°F
- Near Safe Harbor Dam, PA 55°F
- Near Cincinnati Nort…, KY 55°F
Climate Living Index · Glenns Ferry
Glenns Ferry: 28/100 · grade F
Glenns Ferry publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Glenns Ferry, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 54.6°F · 12.9° from 67.5°F | 58/100 · C |
| Frost-free season | 155 days/year | 29/100 · F |
| Precipitation balance | 10.6 in · 24.4 from 35 in | 14/100 · F |
| Normal heat + freeze calendar | 215 calendar days | 7/100 · F |
Glenns Ferry · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Glenns Ferry'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
- 78.8°F
- Coldest month
- 34.2°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 Glenns Ferry sits across the climate record
Three NOAA fields for Glenns Ferry's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 59th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 93%
- Glenns Ferry'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.
How Glenns Ferry compares across U.S. station-mapped locations
Glenns Ferry's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 44°F (7°C) | 25°F (-4°C) | 34°F (1°C) | 1.5" | 25.8 | 0.0 |
| February | 50°F (10°C) | 27°F (-3°C) | 38°F (4°C) | 0.8" | 22.8 | 0.0 |
| March | 60°F (16°C) | 32°F (0°C) | 46°F (8°C) | 1.0" | 19.9 | 0.0 |
| April | 68°F (20°C) | 38°F (3°C) | 53°F (12°C) | 0.9" | 10.5 | 0.4 |
| May | 79°F (26°C) | 46°F (8°C) | 62°F (17°C) | 1.1" | 2.1 | 4.3 |
| June | 88°F (31°C) | 53°F (11°C) | 70°F (21°C) | 0.7" | 0.2 | 12.4 |
| July | 99°F (37°C) | 59°F (15°C) | 79°F (26°C) | 0.2" | 0.0 | 26.8 |
| August | 97°F (36°C) | 56°F (13°C) | 76°F (25°C) | 0.3" | 0.0 | 25.9 |
| September | 86°F (30°C) | 46°F (8°C) | 66°F (19°C) | 0.4" | 1.9 | 11.1 |
| October | 71°F (22°C) | 36°F (2°C) | 54°F (12°C) | 1.0" | 12.1 | 0.8 |
| November | 55°F (13°C) | 29°F (-2°C) | 42°F (6°C) | 1.1" | 22.7 | 0.0 |
| December | 44°F (7°C) | 25°F (-4°C) | 34°F (1°C) | 1.6" | 25.9 | 0.0 |
The year, day by day
Glenns Ferry works both ends of the calendar. Normal highs climb to 101°F by July 25 and hold at or above 90°F on 77 dates, then normal lows drop to freezing or below on 138 dates, bottoming at 24°F around December 24.
When the heat sits
Normal highs reach 90°F from June 22 through September 6, covering 77 dates. The broader mild season, normal highs of 70°F or more, runs April 23 to October 18.
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 15, then returns to freezing around October 30, covering 138 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.
The widest day
August 13 carries the biggest normal gap between afternoon and dawn, 42°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Glenns Ferry.
Where Glenns Ferry Stands Nationally
Aridity defines the water calendar: about 11 inches in a normal year lands this among the driest tenth of ranked stations.
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 42°F, sharper than nine in ten ranked stations see.
Glenns Ferry earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Glenns Ferry's wet season runs through the cold months
December, January and February carry 37% of the year's precipitation here, while June through August contribute 12%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a 44.6°F seasonal spread.
- Wettest month
- December, 1.6"
- Driest month
- July, 0.2"
- Wettest three months
- December, January, November (39% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
Frost Dates & Growing Season
First Fall Freeze
October 3
50% probability date
Last Spring Freeze
May 1
50% probability date
Growing Season
155 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,934
Higher = more heating needed
Cooling Degree Days
1,173
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside ID closest to Glenns Ferry 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).
- Brownstown, IL 55°F · 0.0°F off
- Flemingsburg, KY 55°F · 0.0°F off
- Hammonton, NJ 55°F · 0.0°F off
- Jetmore, KS 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (10.6" here), excluding temperature-peer places.
- Gunnison, CO 10.6" · 0.0" off
- Vernon, UT 10.6" · 0.0" off
- Tucson, AZ 10.6" · 0.0" off
- Bend, OR 10.6" · 0.0" off
Scarce-water calendar
Where Glenns Ferry's limited precipitation lands
heating led · dry · mid swing
Glenns Ferry's energy balance leans toward cold weather: 4,934 annual heating degree days against 1,173 for cooling. Its 44.6°F seasonal range still makes the monthly rows more useful than the annual average alone.
Glenns Ferry's frost-free season lasts about 155 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 Glenns Ferry's middle-range seasonal profile. The measured spread is 44.6°F. The annual average is 55°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Glenns Ferry's cold-season load does not imply a wet climate. Annual precipitation is 10.6 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.
Glenns Ferry wettest normal
December
December concentrates the scarce annual total (10.6 inches).
Glenns Ferry driest normal
July
July is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Glenns Ferry's climate
How dry is Glenns Ferry? ▼
How many days above 90°F does Glenns Ferry get? ▼
How much energy does heating and cooling require in Glenns Ferry? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Glenns Ferry's primary station: GLENNS FERRY (USC00103631). 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 1631690). Match rule for Glenns Ferry: 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 Glenns Ferry 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.