Lennep (5 mi SW), Montana climate: Climate normals at a NOAA weather station
Lennep (5 mi SW)'s normal year runs from 13°F December nights to 77°F July afternoons, with 18.5 inches of precipitation and 96 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 3.7°C, December lows of −11°C, July highs of 25°C, 470 mm of precipitation a year.
- NOAA stationLennep (5 mi SW)
- Station IDUSC00244954
- Location46.36°N 110.60°W
- Elevation5,600 ft (1,707 m)
On October 23, the normal high in Lennep (5 mi SW) is 48°F and the normal low 25°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lennep (5 mi SW).
- Jan 31° 13°
- Feb 32° 12°
- Mar 40° 18°
- Apr 48° 24°
- May 58° 32°
- Jun 66° 39°
- Jul 77° 43°
- Aug 77° 41°
- Sep 66° 35°
- Oct 52° 27°
- Nov 38° 19°
- Dec 30° 13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Lennep (5 mi SW) each month?
July is the warmest month, with normal highs of 77°F; December the coldest, with normal lows of 13°F. The most precipitation falls in May (3.06 in), the least in February (0.86 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°F | 13°F | 21.9°F | 0.99 | 17.0 | 10 | <1 | 30 | 9 h |
| February | 32°F | 12°F | 21.9°F | 0.86 | 13.3 | 9 | <1 | 27 | 10 h 20 min |
| March | 40°F | 18°F | 29.0°F | 1.07 | 15.5 | 11 | <1 | 30 | 11 h 50 min |
| April | 48°F | 24°F | 35.9°F | 1.86 | 12.5 | 12 | <1 | 27 | 13 h 30 min |
| May | 58°F | 32°F | 44.9°F | 3.06 | 2.5 | 13 | <1 | 16 | 15 h |
| June | 66°F | 39°F | 52.5°F | 2.92 | 0.3 | 12 | <1 | 4 | 15 h 50 min |
| July | 77°F | 43°F | 60.1°F | 1.49 | 0.0 | 8 | 1 | <1 | 15 h 30 min |
| August | 77°F | 41°F | 58.9°F | 1.32 | 0.0 | 8 | 1 | 2 | 14 h 10 min |
| September | 66°F | 35°F | 50.3°F | 1.33 | 0.9 | 7 | <1 | 11 | 12 h 40 min |
| October | 52°F | 27°F | 39.1°F | 1.58 | 7.9 | 10 | <1 | 24 | 11 h |
| November | 38°F | 19°F | 28.5°F | 1.05 | 12.5 | 9 | <1 | 27 | 9 h 30 min |
| December | 30°F | 13°F | 21.4°F | 0.98 | 13.2 | 11 | <1 | 30 | 8 h 40 min |
| Year (annual) | 51°F | 26°F | 38.7°F | 18.51 | 95.6 | 119 | 2 | 228 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −11°C | −5.6°C | 25 mm | 43 cm |
| February | 0°C | −11°C | −5.6°C | 22 mm | 34 cm |
| March | 5°C | −8°C | −1.7°C | 27 mm | 39 cm |
| April | 9°C | −5°C | 2.2°C | 47 mm | 32 cm |
| May | 14°C | 0°C | 7.2°C | 78 mm | 6 cm |
| June | 19°C | 4°C | 11.4°C | 74 mm | 1 cm |
| July | 25°C | 6°C | 15.6°C | 38 mm | 0 cm |
| August | 25°C | 5°C | 14.9°C | 34 mm | 0 cm |
| September | 19°C | 1°C | 10.2°C | 34 mm | 2 cm |
| October | 11°C | −3°C | 3.9°C | 40 mm | 20 cm |
| November | 3°C | −7°C | −1.9°C | 27 mm | 32 cm |
| December | −1°C | −11°C | −5.9°C | 25 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00244954; 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.
Which months are mildest at Lennep (5 mi SW)?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September has the fewest days with rain (7).
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 USC00244954.
How hot and how cold does it get at Lennep (5 mi SW)?
In a normal year in Lennep (5 mi SW), 2 days a year reach 90°F, 228 nights fall to 32°F or colder and 119 days bring measurable precipitation.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 228a normal year
- Days that stay below freezing
- 60high of 32°F or less
- Days with 0.01 inch of precipitation
- 119a normal year
- Days with 1 inch of snow or more
- 28a normal year
The highest temperature in this station's record (since 1959) is 99°F, on July 25, 1988; the lowest is −44°F, on February 3, 1989.
The wettest calendar year on that record is 1975, with 25.45 in; the snowiest season is 1996–97, with 175.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00244954; records: ACIS (NOAA Regional Climate Centers), station USC00244954. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Lennep (5 mi SW)?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Lennep (5 mi SW), 4.0 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 | 73% | 1.7 |
| February | 76% | 2.8 |
| March | 72% | 3.9 |
| April | 68% | 4.8 |
| May | 69% | 5.7 |
| June | 74% | 6.5 |
| July | 85% | 7.2 |
| August | 84% | 6.0 |
| September | 78% | 4.4 |
| October | 71% | 2.8 |
| November | 66% | 1.7 |
| December | 64% | 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 many heating and cooling degree days does Lennep (5 mi SW) record?
A normal year at Lennep (5 mi SW) brings 9,598 heating degree days, 79% more than the median U.S. place (5,373), and 28 cooling degree days, 97% fewer than the median (908). Ten months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 885 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,338 | 0 |
| February | 1,207 | 0 |
| March | 1,118 | 0 |
| April | 875 | 0 |
| May | 625 | 0 |
| June | 376 | 1 |
| July | 170 | 16 |
| August | 199 | 11 |
| September | 442 | 1 |
| October | 804 | 0 |
| November | 1,094 | 0 |
| December | 1,353 | 0 |
| Year (annual) | 9,598 | 28 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00244954. 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.
Have recent years at Lennep (5 mi SW) been warmer than normal?
Over 40 complete years from 1960 to 2018, the station's annual mean temperature rose at a fitted 6.3°F per century (+0.35°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Lennep (5 mi SW)'s climate compare?
Lennep (5 mi SW) is warmer than 7 of the 141 places with their own NOAA record in Montana, and wetter than 111. Across the 7,247 U.S. stations with normals, its annual mean of 38.7°F is warmer than 4%.
In the Köppen classification computed from these normals, Lennep (5 mi SW) 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.
Questions about Lennep (5 mi SW)'s climate
What is the coldest month at Lennep (5 mi SW)?
December, with a normal high of 30°F and a normal low of 13°F. The warmest is July (77°F by day, 43°F at night).
Does it snow at Lennep (5 mi SW)?
Yes: 96 inches in a normal year, falling on 61 days with 0.1 inch or more, the most in January (17.0 inches).
What is the rainiest month at Lennep (5 mi SW)?
May, with 3.06 in of precipitation in a normal year; the driest is February with 0.86 in.
What plant hardiness zone is Lennep (5 mi SW) in?
The USDA's 2023 map puts Lennep (5 mi SW) in zone 4b in ZIP code 59642, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −24°F (23 years, 1991-2020): zone 4b.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Martinsdale, MT16 miles from this station, 43.7°F a year
- White Sulphur Springs, MT19 miles from this station, 42.1°F a year
- Wilsall, MT26 miles from this station, 41.5°F a year
- Melville (4 mi W), MT32 miles from this station, 40.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made