Boise Air Terminal, ID 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 Boise Air Terminal's primary NOAA station, BOISE AIR TERMINAL.
The climate verdict for Boise Air Terminal
Dryness leads the climate profile for Boise Air Terminal, Idaho, with 11.5 inches of precipitation a year. NOAA records an annual average of 53°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.
- 53°F
- average temperature, NOAA 1991-2020 normal
- 54/100
- comfort score, above 31% of station-mapped location scores
- 11.5"
- annual precipitation · 18" snow
- 180 days
- growing season, frost-free days
Boise Air Terminal: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00024131 · Boise Air Terminal, ID 53°F mean · 11.5" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-ARID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 53°F
- RANK-MID #3,705
- PHOTO-FINISH ≈ Pueblo Mem
- PRCP-ARID 11.5"
- SWING-WIDE 45°F
- COMF-LOW 54/100
- LOAD-HEAT 5,321 HDD
- STN-1 USW00024131
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Pueblo Mem, CO (+ 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.
- Boise Air Termi… (this station) 53°F
- Cold Rosebud, MO 53°F
- Hot Bloomington Ind…, IN 53°F
- Near Pueblo Mem, CO 53°F
- Near Denver Water De…, CO 53°F
Climate Living Index · Boise Air Terminal
Boise Air Terminal: 44/100 · grade D
Boise Air Terminal publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Boise Air Terminal, not an official NOAA rating. Rankings still use Comfort Score 54/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 53.2°F · 14.3° from 67.5°F | 53/100 · D |
| Snowfall burden | 17.6 inches/year | 52/100 · D |
| Frost-free season | 180 days/year | 50/100 · D |
| Normal heat + freeze calendar | 154 calendar days | 44/100 · D |
| Summer moisture balance | 41.8°F mean dew point | 44/100 · D |
| Precipitation balance | 11.5 in · 23.5 from 35 in | 17/100 · F |
Boise Air Terminal · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Boise Air Terminal'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
- 77.3°F
- Coldest month
- 32.1°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 Boise Air Terminal sits across the climate record
Three NOAA fields for Boise Air Terminal's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 54th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 91%
- Boise Air Terminal's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 60th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Boise Air Terminal compares across U.S. station-mapped locations
Boise Air Terminal'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
Boise Air Terminal's measured station temperature trend
MethodologyAcross 152 complete annual observations from 1865 to 2025, BOISE AIR TERMINAL warmed at a fitted rate of 0.11°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Boise Air Terminal primary station fitted change +0.11 °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 | 39°F (4°C) | 26°F (-4°C) | 32°F (0°C) | 1.4" | 5.3" | 25.5 | 0.0 |
| February | 46°F (8°C) | 29°F (-2°C) | 38°F (3°C) | 1.0" | 3.3" | 20.1 | 0.0 |
| March | 56°F (13°C) | 35°F (2°C) | 45°F (7°C) | 1.3" | 1.2" | 11.2 | 0.0 |
| April | 62°F (17°C) | 40°F (4°C) | 51°F (11°C) | 1.2" | 0.1" | 5.2 | 0.1 |
| May | 72°F (22°C) | 48°F (9°C) | 60°F (16°C) | 1.4" | 0.0" | 0.8 | 1.4 |
| June | 81°F (27°C) | 54°F (12°C) | 68°F (20°C) | 0.8" | 0.0" | 0.0 | 6.6 |
| July | 93°F (34°C) | 62°F (17°C) | 77°F (25°C) | 0.2" | 0.0" | 0.0 | 22.1 |
| August | 91°F (33°C) | 61°F (16°C) | 76°F (24°C) | 0.2" | 0.0" | 0.0 | 19.5 |
| September | 80°F (27°C) | 53°F (11°C) | 66°F (19°C) | 0.4" | 0.0" | 0.2 | 4.8 |
| October | 65°F (18°C) | 42°F (5°C) | 53°F (12°C) | 0.8" | 0.1" | 3.7 | 0.3 |
| November | 49°F (9°C) | 32°F (0°C) | 40°F (5°C) | 1.2" | 2.0" | 16.3 | 0.0 |
| December | 39°F (4°C) | 25°F (-4°C) | 32°F (0°C) | 1.5" | 5.6" | 25.2 | 0.0 |
The year, day by day
Boise Air Terminal works both ends of the calendar. Normal highs climb to 95°F by July 26 and hold at or above 90°F on 45 dates, then normal lows drop to freezing or below on 109 dates, bottoming at 24°F around December 26.
When the heat sits
Normal highs reach 90°F from July 6 through August 19, covering 45 dates. The broader mild season, normal highs of 70°F or more, runs May 8 to October 6.
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 1, then returns to freezing around November 14, covering 109 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 December 22, when 38% of years recorded at least a hundredth of an inch. The driest is August 2 at 7%. Summed across the calendar, that is about 90 wet dates a year.
The widest day
July 19 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 Boise Air Terminal.
Where Boise Air Terminal Stands Nationally
Aridity defines the water calendar: about 12 inches in a normal year lands this among the driest tenth of ranked stations.
Boise Air Terminal 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: 5.3"
11.1 days with precipitation
Snow: 3.3"
9.1 days with precipitation
Snow: 1.2"
10.1 days with precipitation
Snow: 0.1"
9.2 days with precipitation
8.4 days with precipitation
5.3 days with precipitation
2.3 days with precipitation
2.1 days with precipitation
3.9 days with precipitation
Snow: 0.1"
6.0 days with precipitation
Snow: 2.0"
9.7 days with precipitation
Snow: 5.6"
12.0 days with precipitation
Boise Air Terminal spreads its precipitation across the year
Neither half of the year dominates here: June through August take 10% of the annual total and December through February 34%, with neither reaching the 35% that would mark a distinct wet season. Boise Air Terminal has no dry season to plan around, though it does carry a wide 45.2°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: December averages 1.5" and August 0.2". The three wettest months together take 38% 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.
Boise Air Terminal is dry, and what does fall arrives gently
Only about 89 days a year record measurable precipitation here, 24% of the calendar, and they carry 11.5" between them. At roughly 0.13 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 December at about 12 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.
Winter brings real snow to Boise Air Terminal
Boise Air Terminal averages 17.6 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 18 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 17.6 inches of depth.
- Days recording measurable snow: about 18 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 15% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 21
50% probability date
Last Spring Freeze
April 24
50% probability date
Growing Season
180 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,321
Higher = more heating needed
Cooling Degree Days
1,045
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 73% | 6.8 | 43% | 37% |
| February | 62% | 8.2 | 46% | 31% |
| March | 53% | 8.7 | 50% | 23% |
| April | 47% | 8.6 | 61% | 17% |
| May | 45% | 8.0 | 64% | 13% |
| June | 36% | 7.6 | 84% | 3% |
| July | 30% | 7.2 | 89% | 2% |
| August | 33% | 7.0 | 86% | 3% |
| September | 41% | 7.0 | 78% | 8% |
| October | 58% | 6.7 | 61% | 22% |
| November | 72% | 7.0 | 48% | 35% |
| December | 76% | 6.6 | 40% | 42% |
Nationwide similar cities
Other rankable U.S. places outside ID closest to Boise Air Terminal 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 (53°F here).
- Alton, KS 53°F · 0.0°F off
- Bandon, OR 53°F · 0.0°F off
- Dayville, OR 53°F · 0.0°F off
- Farmington, NM 53°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (11.5" here), excluding temperature-peer places.
- Cody, WY 11.5" · 0.0" off
- Eagle, AK 11.5" · 0.0" off
- Grantsville, UT 11.6" · 0.0" off
- Manila, UT 11.5" · 0.0" off
Snow and freeze rhythm
When cold and snow define Boise Air Terminal
heating led · dry · mid swing
Boise Air Terminal's energy balance leans toward cold weather: 5,321 annual heating degree days against 1,045 for cooling. Its 45.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Boise Air Terminal's frost-free season lasts about 180 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Boise Air Terminal coldest normal
December
The monthly mean of 32°F (0°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Boise Air Terminal typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Boise Air Terminal snow peak
December
Boise Air Terminal averages 17.6 inches of snow a year, with December the snowiest month on the normals.
Questions about Boise Air Terminal's climate
How much snow does Boise Air Terminal get? ▼
How many days above 90°F does Boise Air Terminal get? ▼
How much energy does heating and cooling require in Boise Air Terminal? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Boise Air Terminal's primary station: BOISE AIR TERMINAL (USW00024131). 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 Boise Air Terminal; 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 Boise Air Terminal 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.