Brownlee Dam, 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 Brownlee Dam's primary NOAA station, BROWNLEE DAM.
The climate verdict for Brownlee Dam
Dryness leads the climate profile for Brownlee Dam, Idaho, with 14.8 inches of precipitation a year. NOAA records an annual average of 55°F. Its climate comfort score of 68/100 (good) lands mid-pack nationally, exceeding 56% of station-mapped location scores.
- 55°F
- yearly average temperature, NOAA normal
- 68/100
- comfort score, above 56% of station-mapped location scores
- 14.8"
- precipitation, annual total
- 217 days
- frost-free growing season
Brownlee Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00101180 · Brownlee Dam, ID 55°F mean · 14.8" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 55°F
- RANK-UPPER #4,117
- PHOTO-FINISH ≈ Princeton
- PRCP-DRY 14.8"
- SWING-WIDE 46°F
- COMF-MID 68/100
- LOAD-HEAT 4,922 HDD
- STN-1 USC00101180
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Princeton, IN (+ 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.
- Brownlee Dam (this station) 55°F
- Cold Washington, MO 55°F
- Hot Charleston, IL 55°F
- Near Princeton, IN 55°F
- Near California, MO 55°F
Climate Living Index · Brownlee Dam
Brownlee Dam: 50/100 · grade D
Brownlee Dam publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Brownlee Dam, not an official NOAA rating. Rankings still use Comfort Score 68/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 217 days/year | 76/100 · B |
| Annual temperature balance | 55.0°F · 12.5° from 67.5°F | 59/100 · C |
| Normal heat + freeze calendar | 155 calendar days | 43/100 · D |
| Precipitation balance | 14.8 in · 20.2 from 35 in | 28/100 · F |
Brownlee Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Brownlee Dam'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
- 79.6°F
- Coldest month
- 33.3°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 Brownlee Dam sits across the climate record
Three NOAA fields for Brownlee Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 60th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 83%
- Brownlee Dam'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 Brownlee Dam compares across U.S. station-mapped locations
Brownlee Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 44% score exceeds 56% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 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 | 39°F (4°C) | 28°F (-2°C) | 33°F (1°C) | 1.9" | 23.0 | 0.0 |
| February | 45°F (7°C) | 30°F (-1°C) | 37°F (3°C) | 1.3" | 17.4 | 0.0 |
| March | 55°F (13°C) | 35°F (2°C) | 45°F (7°C) | 1.5" | 5.9 | 0.0 |
| April | 64°F (18°C) | 42°F (5°C) | 53°F (12°C) | 1.4" | 1.3 | 0.0 |
| May | 74°F (23°C) | 50°F (10°C) | 62°F (17°C) | 1.8" | 0.0 | 3.0 |
| June | 83°F (28°C) | 56°F (13°C) | 69°F (21°C) | 1.2" | 0.0 | 7.6 |
| July | 95°F (35°C) | 64°F (18°C) | 80°F (26°C) | 0.4" | 0.0 | 24.6 |
| August | 94°F (35°C) | 63°F (17°C) | 79°F (26°C) | 0.2" | 0.0 | 23.7 |
| September | 83°F (28°C) | 55°F (13°C) | 69°F (21°C) | 0.5" | 0.0 | 9.3 |
| October | 66°F (19°C) | 45°F (7°C) | 56°F (13°C) | 1.1" | 0.4 | 0.2 |
| November | 50°F (10°C) | 35°F (2°C) | 42°F (6°C) | 1.4" | 8.7 | 0.0 |
| December | 40°F (4°C) | 29°F (-2°C) | 34°F (1°C) | 2.0" | 22.3 | 0.0 |
The year, day by day
Brownlee Dam works both ends of the calendar. Normal highs climb to 98°F by July 26 and hold at or above 90°F on 59 dates, then normal lows drop to freezing or below on 96 dates, bottoming at 27°F around January 2.
When the heat sits
Normal highs reach 90°F from July 2 through August 29, covering 59 dates. The broader mild season, normal highs of 70°F or more, runs May 3 to October 9.
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 27, covering 96 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 3, when 43% of years recorded at least a hundredth of an inch. The driest is August 14 at 9%. Summed across the calendar, that is about 100 wet dates a year.
The widest day
August 4 carries the biggest normal gap between afternoon and dawn, 32°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Brownlee Dam.
Where Brownlee Dam Stands Nationally
A drier-than-most normal water year — around 15 inches, below what four out of five ranked stations collect.
Brownlee Dam 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
13.3 days with precipitation
9.4 days with precipitation
10.8 days with precipitation
10.6 days with precipitation
9.5 days with precipitation
7.9 days with precipitation
2.9 days with precipitation
2.3 days with precipitation
3.0 days with precipitation
6.8 days with precipitation
10.4 days with precipitation
12.6 days with precipitation
Brownlee Dam 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 35%, with neither reaching the 35% that would mark a distinct wet season. Brownlee Dam has no dry season to plan around, though it does carry a wide 46.3°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: December averages 2.0" 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.
Brownlee Dam is dry, and what does fall arrives gently
Only about 100 days a year record measurable precipitation here, 27% of the calendar, and they carry 14.8" 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 January at about 13 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.
Frost Dates & Growing Season
First Fall Freeze
November 5
50% probability date
Last Spring Freeze
April 2
50% probability date
Growing Season
217 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,922
Higher = more heating needed
Cooling Degree Days
1,299
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside ID closest to Brownlee Dam 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).
- Buffalo, MO 55°F · 0.0°F off
- Carmi, IL 55°F · 0.0°F off
- Cassoday, KS 55°F · 0.0°F off
- Charleston, IL 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (14.8" here), excluding temperature-peer places.
- Lingle, WY 14.8" · 0.0" off
- Billings, MT 14.8" · 0.0" off
- Mccamey, TX 14.8" · 0.0" off
- Trinidad, CO 14.9" · 0.0" off
Scarce-water calendar
Where Brownlee Dam's limited precipitation lands
heating led · dry · mid swing
Brownlee Dam's energy balance leans toward cold weather: 4,922 annual heating degree days against 1,299 for cooling. Its 46.3°F seasonal range still makes the monthly rows more useful than the annual average alone.
Brownlee Dam's frost-free season lasts about 217 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 Brownlee Dam's middle-range seasonal profile. The measured spread is 46.3°F. The annual average is 55°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Brownlee Dam's cold-season load does not imply a wet climate. Annual precipitation is 14.8 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.
Brownlee Dam wettest normal
December
December concentrates the scarce annual total (14.8 inches).
Brownlee Dam driest normal
August
August is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Brownlee Dam's climate
How dry is Brownlee Dam? ▼
How many days above 90°F does Brownlee Dam get? ▼
How much energy does heating and cooling require in Brownlee Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Brownlee Dam's primary station: BROWNLEE DAM (USC00101180). 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 Brownlee Dam; 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 Brownlee Dam 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.