Judith Gap, Montana climate: Normal weather by month, frost dates and records
Judith Gap's normal year runs from 12°F December nights to 79°F July afternoons, with 15.9 inches of precipitation and 28 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.3°C, December lows of −11°C, July highs of 26°C, 404 mm of precipitation a year.
- NOAA stationJudith Gap
- Station IDUSC00244538
- Location46.68°N 109.75°W
- Elevation4,630 ft (1,411 m)
- Population108
On October 23, the normal high in Judith Gap is 51°F and the normal low 27°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 Judith Gap.
- Jan 34° 12°
- Feb 34° 13°
- Mar 42° 20°
- Apr 51° 27°
- May 60° 36°
- Jun 68° 44°
- Jul 79° 50°
- Aug 80° 49°
- Sep 69° 40°
- Oct 54° 30°
- Nov 42° 21°
- Dec 33° 12°
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 Judith Gap each month?
July is the warmest month, with normal highs of 79°F; December the coldest, with normal lows of 12°F. The most precipitation falls in May (3.26 in), the least in December (0.38 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 34°F | 12°F | 22.9°F | 0.43 | 4.5 | 3 | <1 | 29 | 9 h |
| February | 34°F | 13°F | 23.3°F | 0.45 | 6.7 | 3 | <1 | 27 | 10 h 20 min |
| March | 42°F | 20°F | 31.0°F | 0.64 | 3.6 | 4 | <1 | 27 | 11 h 50 min |
| April | 51°F | 27°F | 39.2°F | 1.75 | 2.8 | 8 | <1 | 22 | 13 h 30 min |
| May | 60°F | 36°F | 47.9°F | 3.26 | 0.4 | 10 | <1 | 11 | 15 h |
| June | 68°F | 44°F | 55.7°F | 3.03 | 0.0 | 10 | 1 | 1 | 15 h 50 min |
| July | 79°F | 50°F | 64.7°F | 1.73 | 0.0 | 8 | 9 | <1 | 15 h 30 min |
| August | 80°F | 49°F | 64.1°F | 1.49 | 0.0 | 7 | 6 | <1 | 14 h 20 min |
| September | 69°F | 40°F | 54.4°F | 1.36 | 0.2 | 5 | 1 | 4 | 12 h 40 min |
| October | 54°F | 30°F | 41.7°F | 0.89 | 1.8 | 5 | <1 | 18 | 11 h |
| November | 42°F | 21°F | 31.6°F | 0.51 | 3.7 | 3 | <1 | 24 | 9 h 30 min |
| December | 33°F | 12°F | 22.6°F | 0.38 | 3.8 | 3 | <1 | 29 | 8 h 40 min |
| Year (annual) | 54°F | 29°F | 41.6°F | 15.92 | 27.5 | 68 | 17 | 192 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −11°C | −5.1°C | 11 mm | 11 cm |
| February | 1°C | −11°C | −4.8°C | 11 mm | 17 cm |
| March | 6°C | −7°C | −0.6°C | 16 mm | 9 cm |
| April | 11°C | −3°C | 4.0°C | 44 mm | 7 cm |
| May | 16°C | 2°C | 8.8°C | 83 mm | 1 cm |
| June | 20°C | 6°C | 13.2°C | 77 mm | 0 cm |
| July | 26°C | 10°C | 18.2°C | 44 mm | 0 cm |
| August | 27°C | 9°C | 17.8°C | 38 mm | 0 cm |
| September | 20°C | 5°C | 12.4°C | 35 mm | 1 cm |
| October | 12°C | −1°C | 5.4°C | 23 mm | 5 cm |
| November | 6°C | −6°C | −0.2°C | 13 mm | 9 cm |
| December | 0°C | −11°C | −5.2°C | 10 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00244538; 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 Judith Gap?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September has the fewest days with rain (5).
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 USC00244538.
When is the last frost in Judith Gap?
In Judith Gap, the last spring frost (32°F) comes after June 1 in half of years and after June 16 in one year in ten; the first autumn frost comes before September 15 in half of years and before August 31 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
- June 11 year in 10 after June 16; 9 in 10 after May 17
- First autumn frost, half of years before
- September 151 year in 10 before August 31; 9 in 10 before September 28
NOAA puts the median frost-free season at 104 days, and the season without a hard freeze (28°F) at 134 days.
A hard freeze (28°F) comes after May 15 in half of springs and before September 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Judith Gap in zone 4b in ZIP code 59453, 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 USC00244538; 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 Judith Gap?
In a normal year in Judith Gap, 17 days a year reach 90°F (1 of them 100°F or more), 192 nights fall to 32°F or colder and 68 days bring measurable precipitation.
- Days at 90°F or more
- 17a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 192a normal year
- Days that stay below freezing
- 43high of 32°F or less
- Days with 0.01 inch of precipitation
- 68a normal year
- Days with 1 inch of snow or more
- 11a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00244538.
How sunny is Judith Gap?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Judith Gap, 4.0 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 1.7 |
| February | 74% | 2.6 |
| March | 71% | 3.7 |
| April | 68% | 4.8 |
| May | 71% | 5.8 |
| June | 77% | 6.7 |
| July | 87% | 7.1 |
| August | 85% | 5.9 |
| September | 79% | 4.4 |
| October | 73% | 2.8 |
| November | 71% | 1.8 |
| December | 66% | 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 Judith Gap need?
A normal year in Judith Gap brings 8,664 heating degree days, 61% more than the median U.S. place (5,373), and 162 cooling degree days, 82% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,411 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,305 | 0 |
| February | 1,169 | 0 |
| March | 1,053 | 0 |
| April | 776 | 0 |
| May | 531 | 1 |
| June | 286 | 8 |
| July | 82 | 73 |
| August | 96 | 69 |
| September | 329 | 11 |
| October | 721 | 0 |
| November | 1,004 | 0 |
| December | 1,314 | 0 |
| Year (annual) | 8,664 | 162 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00244538. 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 Judith Gap's climate compare?
Judith Gap is warmer than 25 of the other 140 places with their own NOAA record in Montana, and wetter than 91. Across the 7,247 U.S. stations with normals, its annual mean of 41.6°F is warmer than 9%.
In the Köppen classification computed from these normals, Judith Gap 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.
What do Judith Gap's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Judith Gap. This page uses Judith Gap; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Judith Gap (13 mi E) USC00244545 | 14 mi E | 4,791 ft | 45.4°F | 13°F | 85°F | 15.2 | – | June 3 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Judith Gap's climate
What is the coldest month in Judith Gap?
December, with a normal high of 33°F and a normal low of 12°F. The warmest is July (79°F by day, 50°F at night).
Does it snow in Judith Gap?
Yes: 28 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in February (6.7 inches).
What is the rainiest month in Judith Gap?
May, with 3.26 in of precipitation in a normal year; the driest is December with 0.38 in.
What plant hardiness zone is Judith Gap in?
The USDA's 2023 map puts Judith Gap in zone 4b in ZIP code 59453, the nearest ZIP area.
How late can frost come in Judith Gap?
In half of years the last 32°F night comes after June 1; in one year in ten it comes after June 16. Waiting until June 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Harlowton, MT17 miles from this station, 43.8°F a year
- Moccasin, MT28 miles from this station, 43.5°F a year
- Lewistown, MT29 miles from this station, 43.1°F a year
- Lewistown (42 mi WSW), MT29 miles from this station, 40.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made