Nashua, Montana climate: Normal weather by month, frost dates and records
Nashua's normal year runs from 3°F January nights to 88°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.8°C, January lows of −16°C, July highs of 31°C.
- NOAA stationNashua #2
- Station IDUSC00245983
- Location48.13°N 106.35°W
- Elevation2,067 ft (630 m)
- Population294
On October 23, the normal high in Nashua is 55°F and the normal low 29°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Nashua.
- Jan 26° 3°
- Feb 31° 8°
- Mar 45° 19°
- Apr 61° 32°
- May 71° 42°
- Jun 79° 52°
- Jul 88° 57°
- Aug 88° 56°
- Sep 76° 45°
- Oct 59° 32°
- Nov 42° 18°
- Dec 29° 7°
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 Nashua each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 3°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 26°F | 3°F | 14.3°F | – | <1 | 31 | 8 h 50 min |
| February | 31°F | 8°F | 19.3°F | – | <1 | 28 | 10 h 10 min |
| March | 45°F | 19°F | 32.3°F | – | <1 | 28 | 11 h 50 min |
| April | 61°F | 32°F | 46.2°F | – | <1 | 14 | 13 h 40 min |
| May | 71°F | 42°F | 56.4°F | – | 1 | 5 | 15 h 10 min |
| June | 79°F | 52°F | 65.5°F | – | 3 | <1 | 16 h |
| July | 88°F | 57°F | 72.4°F | – | 17 | <1 | 15 h 40 min |
| August | 88°F | 56°F | 71.6°F | – | 15 | <1 | 14 h 20 min |
| September | 76°F | 45°F | 60.3°F | – | 4 | 2 | 12 h 40 min |
| October | 59°F | 32°F | 45.3°F | – | <1 | 17 | 11 h |
| November | 42°F | 18°F | 29.8°F | – | <1 | 28 | 9 h 20 min |
| December | 29°F | 7°F | 17.9°F | – | <1 | 31 | 8 h 20 min |
| Year (annual) | 58°F | 31°F | 44.3°F | – | 40 | 183 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −3°C | −16°C | −9.8°C |
| February | −1°C | −14°C | −7.1°C |
| March | 7°C | −7°C | 0.2°C |
| April | 16°C | 0°C | 7.9°C |
| May | 22°C | 6°C | 13.6°C |
| June | 26°C | 11°C | 18.6°C |
| July | 31°C | 14°C | 22.4°C |
| August | 31°C | 13°C | 22.0°C |
| September | 24°C | 7°C | 15.7°C |
| October | 15°C | 0°C | 7.4°C |
| November | 5°C | −8°C | −1.2°C |
| December | −2°C | −14°C | −7.8°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Glasgow (14 miles away), gets 41 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00245983; 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 Nashua?
Normal highs sit between 65°F and 85°F in May, June and September.
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 USC00245983.
When is the last frost in Nashua?
In Nashua, the last spring frost (32°F) comes after May 12 in half of years and after May 26 in one year in ten; the first autumn frost comes before September 24 in half of years and before September 12 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 121 year in 10 after May 26; 9 in 10 after April 30
- First autumn frost, half of years before
- September 241 year in 10 before September 12; 9 in 10 before October 6
NOAA puts the median frost-free season at 134 days, and the season without a hard freeze (28°F) at 153 days.
A hard freeze (28°F) comes after May 1 in half of springs and before October 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Nashua in zone 4a in ZIP code 59248, the nearest ZIP area.
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00245983; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Nashua?
In a normal year in Nashua, 40 days a year reach 90°F (5 of them 100°F or more) and 183 nights fall to 32°F or colder.
- Days at 90°F or more
- 40a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 183a normal year
- Days that stay below freezing
- 64high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00245983.
How sunny is Nashua?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Nashua, 4.0 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 1.5 |
| February | 78% | 2.6 |
| March | 75% | 3.8 |
| April | 73% | 4.9 |
| May | 75% | 6.0 |
| June | 77% | 6.5 |
| July | 86% | 6.9 |
| August | 85% | 5.7 |
| September | 79% | 4.2 |
| October | 75% | 2.7 |
| November | 72% | 1.6 |
| December | 68% | 1.1 |
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 Nashua need?
A normal year in Nashua brings 8,134 heating degree days, 51% more than the median U.S. place (5,373), and 615 cooling degree days, 32% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,510 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,572 | 0 |
| February | 1,281 | 0 |
| March | 1,015 | 0 |
| April | 565 | 1 |
| May | 280 | 14 |
| June | 71 | 84 |
| July | 10 | 238 |
| August | 21 | 227 |
| September | 191 | 50 |
| October | 612 | 2 |
| November | 1,056 | 0 |
| December | 1,460 | 0 |
| Year (annual) | 8,134 | 615 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00245983. 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.
How does Nashua's climate compare?
Nashua is warmer than 79 of the other 140 places with their own NOAA record in Montana. Across the 7,247 U.S. stations with normals, its annual mean of 44.3°F is warmer than 17%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Nashua share this climate record?
Frazer 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.
- Frazer, MT346 people · 15 mi E
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 Nashua's climate
What is the coldest month in Nashua?
January, with a normal high of 26°F and a normal low of 3°F. The warmest is July (88°F by day, 57°F at night).
Does it snow in Nashua?
Yes. NOAA publishes no 1991-2020 snowfall normal for Nashua's NOAA station; the nearest record that keeps one, Glasgow (14 miles away), records 41 inches of snow in a normal year.
What plant hardiness zone is Nashua in?
The USDA's 2023 map puts Nashua in zone 4a in ZIP code 59248, the nearest ZIP area.
How late can frost come in Nashua?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after May 26. Waiting until May 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Fort Peck, MT9 miles from this station, 46.5°F a year
- Glasgow, MT14 miles from this station, 43.9°F a year
- St. Marie, MT21 miles from this station, 43.0°F a year
- Wolf Point, MT36 miles from this station, 43.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made