Terry, Montana climate: Normal weather by month, frost dates and records
Terry's normal year runs from 6°F January nights to 88°F July afternoons, with 13.4 inches of precipitation and 12 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.4°C, January lows of −14°C, July highs of 31°C, 339 mm of precipitation a year.
- NOAA stationTerry
- Station IDUSC00248165
- Location46.79°N 105.30°W
- Elevation2,250 ft (686 m)
- Population574
On October 22, the normal high in Terry is 56°F and the normal low 30°F, and the chance of measurable rain or snow is 14%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Terry.
- Jan 28° 6°
- Feb 34° 11°
- Mar 46° 22°
- Apr 58° 32°
- May 68° 43°
- Jun 78° 53°
- Jul 88° 59°
- Aug 87° 56°
- Sep 76° 45°
- Oct 59° 33°
- Nov 44° 20°
- Dec 32° 10°
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 Terry each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 6°F. The most precipitation falls in May (2.51 in), the least in January (0.29 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 28°F | 6°F | 17.2°F | 0.29 | 3.3 | 5 | <1 | 31 | 9 h |
| February | 34°F | 11°F | 22.2°F | 0.34 | 1.4 | 3 | <1 | 27 | 10 h 20 min |
| March | 46°F | 22°F | 33.8°F | 0.44 | 1.2 | 5 | <1 | 28 | 11 h 50 min |
| April | 58°F | 32°F | 45.0°F | 1.43 | 1.0 | 6 | <1 | 16 | 13 h 30 min |
| May | 68°F | 43°F | 55.4°F | 2.51 | 0.0 | 9 | 1 | 5 | 15 h |
| June | 78°F | 53°F | 65.4°F | 2.36 | 0.0 | 9 | 4 | <1 | 15 h 50 min |
| July | 88°F | 59°F | 73.3°F | 1.90 | 0.0 | 7 | 15 | <1 | 15 h 30 min |
| August | 87°F | 56°F | 71.5°F | 1.31 | 0.0 | 5 | 14 | <1 | 14 h 20 min |
| September | 76°F | 45°F | 60.5°F | 1.17 | 0.0 | 4 | 4 | 3 | 12 h 40 min |
| October | 59°F | 33°F | 45.9°F | 0.92 | 0.2 | 5 | <1 | 16 | 11 h |
| November | 44°F | 20°F | 31.9°F | 0.37 | 1.6 | 3 | <1 | 28 | 9 h 30 min |
| December | 32°F | 10°F | 21.0°F | 0.32 | 3.1 | 3 | <1 | 31 | 8 h 30 min |
| Year (annual) | 58°F | 32°F | 45.3°F | 13.36 | 11.8 | 65 | 39 | 184 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −2°C | −14°C | −8.2°C | 7 mm | 8 cm |
| February | 1°C | −12°C | −5.4°C | 9 mm | 4 cm |
| March | 8°C | −6°C | 1.0°C | 11 mm | 3 cm |
| April | 14°C | 0°C | 7.2°C | 36 mm | 3 cm |
| May | 20°C | 6°C | 13.0°C | 64 mm | 0 cm |
| June | 26°C | 11°C | 18.6°C | 60 mm | 0 cm |
| July | 31°C | 15°C | 22.9°C | 48 mm | 0 cm |
| August | 31°C | 13°C | 21.9°C | 33 mm | 0 cm |
| September | 24°C | 7°C | 15.8°C | 30 mm | 0 cm |
| October | 15°C | 0°C | 7.7°C | 23 mm | 1 cm |
| November | 7°C | −7°C | −0.1°C | 9 mm | 4 cm |
| December | 0°C | −12°C | −6.1°C | 8 mm | 8 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00248165; 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 Terry?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (4).
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 USC00248165.
When is the last frost in Terry?
In Terry, the last spring frost (32°F) comes after May 12 in half of years and after May 25 in one year in ten; the first autumn frost comes before September 28 in half of years and before September 13 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 25; 9 in 10 after April 30
- First autumn frost, half of years before
- September 281 year in 10 before September 13; 9 in 10 before October 9
NOAA puts the median frost-free season at 137 days, and the season without a hard freeze (28°F) at 156 days.
A hard freeze (28°F) comes after May 1 in half of springs and before October 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Terry in zone 4a in ZIP code 59349, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Terry's NOAA station is in zone 4a: the coldest night of a typical year reaches −29°F (18 complete years).
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00248165; 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 Terry?
In a normal year in Terry, 39 days a year reach 90°F (6 of them 100°F or more), 184 nights fall to 32°F or colder and 65 days bring measurable precipitation.
- Days at 90°F or more
- 39a normal year
- Days at 100°F or more
- 6a normal year
- Nights at 32°F or colder
- 184a normal year
- Days that stay below freezing
- 53high of 32°F or less
- Days with 0.01 inch of precipitation
- 65a normal year
- Days with 1 inch of snow or more
- 5a normal year
The highest temperature in this station's record (since 1949) is 113°F, on July 13, 2026; the lowest is −45°F, on January 20, 1954.
The wettest calendar year on that record is 1999, with 18.76 in; the snowiest season is 2022–23, with 62.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00248165; records: ACIS (NOAA Regional Climate Centers), station USC00248165. Records use complete months only; a month missing more than three days is left out.
How sunny is Terry?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Terry, 4.1 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 1.7 |
| February | 78% | 2.8 |
| March | 74% | 3.9 |
| April | 72% | 5.0 |
| May | 73% | 5.9 |
| June | 80% | 6.8 |
| July | 88% | 7.2 |
| August | 86% | 6.0 |
| September | 80% | 4.4 |
| October | 74% | 2.9 |
| November | 74% | 1.9 |
| December | 70% | 1.3 |
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 Terry need?
A normal year in Terry brings 7,828 heating degree days, 46% more than the median U.S. place (5,373), and 673 cooling degree days, 26% 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 2,534 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,480 | 0 |
| February | 1,197 | 0 |
| March | 966 | 0 |
| April | 599 | 1 |
| May | 316 | 17 |
| June | 84 | 96 |
| July | 13 | 270 |
| August | 30 | 232 |
| September | 189 | 54 |
| October | 595 | 3 |
| November | 993 | 0 |
| December | 1,365 | 0 |
| Year (annual) | 7,828 | 673 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00248165. 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 Terry been warmer than normal lately?
2025 averaged 47.1°F, 1.8°F above the 1991-2020 normal of 45.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.5°F | +2.2°F | 8.89 | 10.0 |
| 2022 | 44.5°F | −0.8°F | 15.01 | 64.1 |
| 2023 | 46.9°F | +1.6°F | 17.42 | 26.6 |
| 2024 | 47.8°F | +2.5°F | 12.61 | – |
| 2025 | 47.1°F | +1.8°F | 14.75 | 29.9 |
Over 42 complete years from 1953 to 2025, the station's annual mean temperature rose at a fitted 3.0°F per century (+0.17°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00248165; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Terry's climate compare?
Terry is warmer than 99 of the other 140 places with their own NOAA record in Montana, and wetter than 38. 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, Terry is BSk: cold semi-arid steppe. 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 Terry share this climate record?
Fallon 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.
- Fallon, MT305 people · 9 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.
What do Terry's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Terry. This page uses Terry; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Terry (21 mi NNW) USC00248169 | 21 mi NW | 3,142 ft | 41.9°F | 7°F | 83°F | 14.3 | – | May 26 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Terry's climate
What is the coldest month in Terry?
January, with a normal high of 28°F and a normal low of 6°F. The warmest is July (88°F by day, 59°F at night).
Does it snow in Terry?
Yes: 12 inches in a normal year, falling on 7 days with 0.1 inch or more, the most in January (3.3 inches).
What is the rainiest month in Terry?
May, with 2.51 in of precipitation in a normal year; the driest is January with 0.29 in.
What plant hardiness zone is Terry in?
The USDA's 2023 map puts Terry in zone 4a in ZIP code 59349, the nearest ZIP area. By the same method at Terry's NOAA station, the coldest night of a typical year reaches −29°F (18 years, 1991-2020): zone 4a.
How late can frost come in Terry?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after May 25. Waiting until May 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Mildred (5 mi N), MT16 miles from this station, 44.1°F a year
- Glendive, MT35 miles from this station, 46.6°F a year
- Mizpah (4 mi NNW), MT35 miles from this station, 46.1°F a year
- Miles City, MT37 miles from this station, 46.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made