Lewiston Nez Perce County, 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 Lewiston Nez Perce County's primary NOAA station, LEWISTON NEZ PERCE CO AP.
The climate verdict for Lewiston Nez Perce County
Dryness leads the climate profile for Lewiston Nez Perce County, Idaho, with 12.9 inches of precipitation a year. NOAA records an annual average of 54°F. Its climate comfort score of 58/100 (moderate) lands mid-pack nationally, exceeding 37% of station-mapped location scores.
- 54°F
- annual average temperature (NOAA normal)
- 58/100
- comfort score, above 37% of station-mapped location scores
- 12.9"
- annual precipitation · 13" snow
- 203 days
- growing season, frost-free days
Lewiston Nez Perce County: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00024149 · Lewiston Nez Perce County, ID 54°F mean · 12.9" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 54°F
- RANK-MID #3,842
- PHOTO-FINISH ≈ Morgantown Hart…
- PRCP-DRY 12.9"
- SWING-MID 41°F
- COMF-MID 58/100
- LOAD-HEAT 4,980 HDD
- STN-1 USW00024149
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Morgantown Hart Fld, WV (+ 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.
- Lewiston Nez Pe… (this station) 54°F
- Cold Fairmont, WV 54°F
- Hot Glenville, WV 54°F
- Near Morgantown Hart…, WV 54°F
- Near Long Branch-oak…, NJ 54°F
Climate Living Index · Lewiston Nez Perce County
Lewiston Nez Perce County: 54/100 · grade D
Lewiston Nez Perce County publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Lewiston Nez Perce County, not an official NOAA rating. Rankings still use Comfort Score 58/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 203 days/year | 66/100 · C |
| Normal heat + freeze calendar | 123 calendar days | 63/100 · C |
| Summer moisture balance | 44.6°F mean dew point | 61/100 · C |
| Snowfall burden | 12.7 inches/year | 59/100 · C |
| Annual temperature balance | 53.8°F · 13.7° from 67.5°F | 55/100 · C |
| Precipitation balance | 12.9 in · 22.1 from 35 in | 21/100 · F |
Lewiston Nez Perce County · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Lewiston Nez Perce County'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
- 75.8°F
- Coldest month
- 35.2°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 Lewiston Nez Perce County sits across the climate record
Three NOAA fields for Lewiston Nez Perce County's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 56th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 88%
- Lewiston Nez Perce County's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 38th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Lewiston Nez Perce County compares across U.S. station-mapped locations
Lewiston Nez Perce County's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
58 37th percentile score exceeds 37% 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
Lewiston Nez Perce County's measured station temperature trend
MethodologyAcross 72 complete annual observations from 1948 to 2025, LEWISTON NEZ PERCE CO AP warmed at a fitted rate of 0.18°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Lewiston Nez Perce County primary station fitted change +0.18 °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 | 42°F (6°C) | 30°F (-1°C) | 36°F (2°C) | 1.1" | 2.7" | 18.1 | 0.0 |
| February | 47°F (8°C) | 32°F (0°C) | 39°F (4°C) | 1.0" | 3.8" | 15.1 | 0.0 |
| March | 55°F (13°C) | 36°F (2°C) | 45°F (7°C) | 1.3" | 0.8" | 9.1 | 0.0 |
| April | 62°F (17°C) | 41°F (5°C) | 52°F (11°C) | 1.4" | 0.0" | 2.4 | 0.0 |
| May | 72°F (22°C) | 48°F (9°C) | 60°F (16°C) | 1.7" | 0.0" | 0.0 | 1.0 |
| June | 79°F (26°C) | 54°F (12°C) | 67°F (19°C) | 1.3" | 0.0" | 0.0 | 4.1 |
| July | 91°F (33°C) | 61°F (16°C) | 76°F (24°C) | 0.5" | 0.0" | 0.0 | 17.6 |
| August | 90°F (32°C) | 60°F (16°C) | 75°F (24°C) | 0.5" | 0.0" | 0.0 | 16.9 |
| September | 80°F (26°C) | 52°F (11°C) | 66°F (19°C) | 0.6" | 0.0" | 0.0 | 4.4 |
| October | 63°F (17°C) | 42°F (6°C) | 53°F (11°C) | 1.1" | 0.0" | 2.7 | 0.0 |
| November | 49°F (9°C) | 35°F (1°C) | 42°F (5°C) | 1.2" | 1.3" | 11.9 | 0.0 |
| December | 41°F (5°C) | 30°F (-1°C) | 35°F (2°C) | 1.1" | 4.1" | 20.4 | 0.0 |
The year, day by day
Lewiston Nez Perce County works both ends of the calendar. Normal highs climb to 94°F by July 26 and hold at or above 90°F on 37 dates, then normal lows drop to freezing or below on 86 dates, bottoming at 29°F around December 23.
When the heat sits
Normal highs reach 90°F from July 12 through August 17, covering 37 dates. The broader mild season, normal highs of 70°F or more, runs May 8 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 February 21, then returns to freezing around November 28, covering 86 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 March 24, when 39% of years recorded at least a hundredth of an inch. The driest is August 8 at 11%. Summed across the calendar, that is about 107 wet dates a year.
The widest day
July 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 Lewiston Nez Perce County.
Where Lewiston Nez Perce County Stands Nationally
A drier-than-most normal water year — around 13 inches, below what four out of five ranked stations collect.
Lewiston Nez Perce County 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: 2.7"
11.2 days with precipitation
Snow: 3.8"
9.6 days with precipitation
Snow: 0.8"
11.7 days with precipitation
11.3 days with precipitation
10.6 days with precipitation
8.9 days with precipitation
3.9 days with precipitation
3.4 days with precipitation
4.7 days with precipitation
8.7 days with precipitation
Snow: 1.3"
11.1 days with precipitation
Snow: 4.1"
11.1 days with precipitation
Lewiston Nez Perce County spreads its precipitation across the year
Neither half of the year dominates here: June through August take 17% of the annual total and December through February 26%, with neither reaching the 35% that would mark a distinct wet season. Lewiston Nez Perce County has no dry season to plan around, though it does carry a 40.6°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 1.7" and July 0.5". 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.
Lewiston Nez Perce County is dry, and what does fall arrives gently
Only about 106 days a year record measurable precipitation here, 29% of the calendar, and they carry 12.9" between them. At roughly 0.12 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 March at about 12 wet days; the driest is August at about 3.
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 Lewiston Nez Perce County
Lewiston Nez Perce County averages 12.7 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 11 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: 12.7 inches of depth.
- Days recording measurable snow: about 11 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 10% 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 26
50% probability date
Last Spring Freeze
April 6
50% probability date
Growing Season
203 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,980
Higher = more heating needed
Cooling Degree Days
913
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 | 71% | 6.1 | 33% | 46% |
| February | 65% | 5.7 | 39% | 35% |
| March | 60% | 5.9 | 40% | 29% |
| April | 53% | 5.9 | 52% | 23% |
| May | 53% | 5.4 | 53% | 20% |
| June | 43% | 5.5 | 74% | 8% |
| July | 32% | 5.4 | 87% | 3% |
| August | 38% | 5.0 | 79% | 6% |
| September | 49% | 4.6 | 72% | 12% |
| October | 67% | 4.7 | 51% | 28% |
| November | 74% | 5.7 | 35% | 45% |
| December | 74% | 6.1 | 28% | 54% |
Nationwide similar cities
Other rankable U.S. places outside ID closest to Lewiston Nez Perce County 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 (54°F here).
- Ashland, KY 54°F · 0.0°F off
- Cheviot, OH 54°F · 0.0°F off
- Emporia, KS 54°F · 0.0°F off
- Eskridge, KS 54°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (12.9" here), excluding temperature-peer places.
- Redlands, CA 12.9" · 0.0" off
- Hope, NM 12.9" · 0.0" off
- Pioche, NV 12.9" · 0.0" off
- Faywood, NM 12.9" · 0.0" off
Snow and freeze rhythm
When cold and snow define Lewiston Nez Perce County
heating led · dry · mid swing
Lewiston Nez Perce County's energy balance leans toward cold weather: 4,980 annual heating degree days against 913 for cooling. Its 40.6°F seasonal range still makes the monthly rows more useful than the annual average alone.
Lewiston Nez Perce County's frost-free season lasts about 203 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Lewiston Nez Perce County coldest normal
December
The monthly mean of 35°F (2°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Lewiston Nez Perce County typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Lewiston Nez Perce County snow peak
December
Lewiston Nez Perce County averages 12.7 inches of snow a year, with December the snowiest month on the normals.
Questions about Lewiston Nez Perce County's climate
How much snow does Lewiston Nez Perce County get? ▼
How many days above 90°F does Lewiston Nez Perce County get? ▼
How much energy does heating and cooling require in Lewiston Nez Perce County? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Lewiston Nez Perce County's primary station: LEWISTON NEZ PERCE CO AP (USW00024149). 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 Lewiston Nez Perce County; 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 Lewiston Nez Perce County 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.