Dubois, Idaho climate: Normal weather by month, frost dates and records
Dubois's normal year runs from 15°F January nights to 87°F July afternoons, with 12.2 inches of precipitation and 47 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.4°C, January lows of −9°C, July highs of 30°C, 311 mm of precipitation a year.
- NOAA stationDubois Experiment Station
- Station IDUSC00102707
- Location44.24°N 112.20°W
- Elevation5,450 ft (1,661 m)
- Population523
On October 14, the normal high in Dubois is 59°F and the normal low 35°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Dubois.
- Jan 30° 15°
- Feb 33° 18°
- Mar 44° 26°
- Apr 57° 33°
- May 67° 41°
- Jun 76° 47°
- Jul 87° 55°
- Aug 85° 53°
- Sep 75° 45°
- Oct 58° 34°
- Nov 41° 24°
- Dec 30° 16°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Dubois each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 15°F. The most precipitation falls in May (2.04 in), the least in February (0.64 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 30°F | 15°F | 22.2°F | 0.78 | 10.1 | 8 | <1 | 31 | 9 h 10 min |
| February | 33°F | 18°F | 25.3°F | 0.64 | 7.6 | 7 | <1 | 27 | 10 h 30 min |
| March | 44°F | 26°F | 35.0°F | 0.81 | 4.5 | 7 | <1 | 25 | 11 h 50 min |
| April | 57°F | 33°F | 44.8°F | 1.29 | 3.2 | 9 | <1 | 16 | 13 h 20 min |
| May | 67°F | 41°F | 53.6°F | 2.04 | 0.5 | 11 | <1 | 5 | 14 h 40 min |
| June | 76°F | 47°F | 61.8°F | 1.59 | 0.1 | 9 | 1 | 1 | 15 h 30 min |
| July | 87°F | 55°F | 70.7°F | 0.68 | 0.0 | 6 | 11 | <1 | 15 h 10 min |
| August | 85°F | 53°F | 69.3°F | 0.73 | 0.0 | 5 | 7 | <1 | 14 h |
| September | 75°F | 45°F | 59.7°F | 0.89 | 0.0 | 6 | 1 | 2 | 12 h 40 min |
| October | 58°F | 34°F | 46.2°F | 1.09 | 1.4 | 7 | <1 | 14 | 11 h |
| November | 41°F | 24°F | 32.4°F | 0.71 | 6.2 | 6 | <1 | 26 | 9 h 40 min |
| December | 30°F | 16°F | 22.6°F | 0.99 | 13.7 | 10 | <1 | 30 | 8 h 50 min |
| Year (annual) | 57°F | 34°F | 45.3°F | 12.24 | 47.3 | 89 | 20 | 178 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −9°C | −5.4°C | 20 mm | 26 cm |
| February | 1°C | −8°C | −3.7°C | 16 mm | 19 cm |
| March | 7°C | −4°C | 1.7°C | 21 mm | 11 cm |
| April | 14°C | 0°C | 7.1°C | 33 mm | 8 cm |
| May | 19°C | 5°C | 12.0°C | 52 mm | 1 cm |
| June | 25°C | 8°C | 16.6°C | 40 mm | 0 cm |
| July | 30°C | 13°C | 21.5°C | 17 mm | 0 cm |
| August | 30°C | 12°C | 20.7°C | 19 mm | 0 cm |
| September | 24°C | 7°C | 15.4°C | 23 mm | 0 cm |
| October | 15°C | 1°C | 7.9°C | 28 mm | 4 cm |
| November | 5°C | −5°C | 0.2°C | 18 mm | 16 cm |
| December | −1°C | −9°C | −5.2°C | 25 mm | 35 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102707; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Dubois?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (6).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102707.
When is the last frost in Dubois?
In Dubois, the last spring frost (32°F) comes after May 18 in half of years and after June 9 in one year in ten; the first autumn frost comes before September 30 in half of years and before September 14 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 181 year in 10 after June 9; 9 in 10 after May 3
- First autumn frost, half of years before
- September 301 year in 10 before September 14; 9 in 10 before October 16
NOAA puts the median frost-free season at 132 days, and the season without a hard freeze (28°F) at 162 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dubois in zone 5b in ZIP code 83423, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Dubois's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (29 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00102707; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Dubois?
In a normal year in Dubois, 20 days a year reach 90°F, 178 nights fall to 32°F or colder and 89 days bring measurable precipitation.
- Days at 90°F or more
- 20a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 178a normal year
- Days that stay below freezing
- 62high of 32°F or less
- Days with 0.01 inch of precipitation
- 89a normal year
- Days with 1 inch of snow or more
- 20a normal year
The highest temperature in this station's record (since 1925) is 103°F, on July 13, 2002; the lowest is −31°F, on December 22, 1990.
The wettest calendar year on that record is 1995, with 21.34 in; the snowiest season is 1951–52, with 113.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00102707; records: ACIS (NOAA Regional Climate Centers), station USC00102707. Records use complete months only; a month missing more than three days is left out.
How sunny is Dubois?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Dubois, 4.3 kWh per square metre a day. July is the sunniest month (85%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 1.8 |
| February | 72% | 2.9 |
| March | 72% | 4.0 |
| April | 71% | 5.2 |
| May | 72% | 6.1 |
| June | 78% | 7.0 |
| July | 85% | 7.3 |
| August | 85% | 6.3 |
| September | 82% | 4.9 |
| October | 75% | 3.2 |
| November | 68% | 2.0 |
| December | 64% | 1.4 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Dubois need?
A normal year in Dubois brings 7,577 heating degree days, 41% more than the median U.S. place (5,373), and 432 cooling degree days, 52% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,158 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,327 | 0 |
| February | 1,110 | 0 |
| March | 930 | 0 |
| April | 606 | 0 |
| May | 356 | 4 |
| June | 142 | 45 |
| July | 21 | 197 |
| August | 26 | 158 |
| September | 187 | 28 |
| October | 583 | 0 |
| November | 977 | 0 |
| December | 1,313 | 0 |
| Year (annual) | 7,577 | 432 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102707. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Dubois been warmer than normal lately?
2025 averaged 47.7°F, 2.4°F above the 1991-2020 normal of 45.3°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 46.8°F | +1.5°F | 12.00 | 59.6 |
| 2022 | 44.5°F | −0.8°F | 9.35 | 60.2 |
| 2024 | 47.5°F | +2.2°F | 12.09 | – |
| 2025 | 47.7°F | +2.4°F | 9.42 | – |
Over 87 complete years from 1927 to 2025, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00102707; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Dubois's climate compare?
Dubois is warmer than 31 of the other 84 places with their own NOAA record in Idaho, and wetter than 32. Across the 7,247 U.S. stations with normals, its annual mean of 45.3°F is warmer than 21%.
In the Köppen classification computed from these normals, Dubois is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Dubois share this climate record?
Spencer has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Spencer, ID31 people · 9 mi N
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Dubois's climate
What is the coldest month in Dubois?
January, with a normal high of 30°F and a normal low of 15°F. The warmest is July (87°F by day, 55°F at night).
Does it snow in Dubois?
Yes: 47 inches in a normal year, falling on 43 days with 0.1 inch or more, the most in December (13.7 inches).
What is the rainiest month in Dubois?
May, with 2.04 in of precipitation in a normal year; the driest is February with 0.64 in.
What plant hardiness zone is Dubois in?
The USDA's 2023 map puts Dubois in zone 5b in ZIP code 83423, the nearest ZIP area. By the same method at Dubois's NOAA station, the coldest night of a typical year reaches −9°F (29 years, 1991-2020): zone 6a.
How late can frost come in Dubois?
In half of years the last 32°F night comes after May 18; in one year in ten it comes after June 9. Waiting until June 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Small (6 mi N), ID11 miles from this station, 42.5°F a year
- Hamer, ID19 miles from this station, 43.8°F a year
- Monteview, ID24 miles from this station, 41.6°F a year
- Lakeview, MT31 miles from this station, 36.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made