Twin Falls-KMVT, Idaho climate: Climate normals at a NOAA weather station
Twin Falls-KMVT's normal year runs from 23°F December nights to 92°F July afternoons, with 9.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, December lows of −5°C, July highs of 33°C, 234 mm of precipitation a year.
- NOAA stationTwin Falls-KMVT
- Station IDUSC00109293
- Location42.58°N 114.46°W
- Elevation3,670 ft (1,119 m)
On October 23, the normal high in Twin Falls-KMVT is 64°F and the normal low 35°F, and the chance of measurable rain or snow is 16%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Twin Falls-KMVT.
- Jan 40° 22°
- Feb 46° 25°
- Mar 56° 32°
- Apr 63° 36°
- May 73° 45°
- Jun 81° 52°
- Jul 92° 58°
- Aug 91° 56°
- Sep 80° 47°
- Oct 67° 37°
- Nov 51° 28°
- Dec 40° 23°
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 Twin Falls-KMVT each month?
July is the warmest month, with normal highs of 92°F; December the coldest, with normal lows of 23°F. The most precipitation falls in December (1.31 in), the least in July (0.16 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 40°F | 22°F | 31.4°F | 1.04 | 8 | <1 | 27 | 9 h 20 min |
| February | 46°F | 25°F | 35.2°F | 0.78 | 7 | <1 | 24 | 10 h 30 min |
| March | 56°F | 32°F | 43.9°F | 0.87 | 7 | <1 | 19 | 11 h 50 min |
| April | 63°F | 36°F | 49.2°F | 1.02 | 8 | <1 | 9 | 13 h 20 min |
| May | 73°F | 45°F | 58.7°F | 1.22 | 7 | 1 | 2 | 14 h 30 min |
| June | 81°F | 52°F | 66.3°F | 0.67 | 6 | 6 | <1 | 15 h 20 min |
| July | 92°F | 58°F | 75.2°F | 0.16 | 2 | 19 | <1 | 15 h |
| August | 91°F | 56°F | 73.0°F | 0.34 | 3 | 16 | <1 | 14 h |
| September | 80°F | 47°F | 63.7°F | 0.33 | 3 | 4 | 1 | 12 h 30 min |
| October | 67°F | 37°F | 51.9°F | 0.70 | 5 | <1 | 9 | 11 h 10 min |
| November | 51°F | 28°F | 39.4°F | 0.76 | 7 | <1 | 22 | 9 h 50 min |
| December | 40°F | 23°F | 31.1°F | 1.31 | 10 | <1 | 27 | 9 h |
| Year (annual) | 65°F | 38°F | 51.6°F | 9.20 | 71 | 46 | 140 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −5°C | −0.3°C | 26 mm |
| February | 8°C | −4°C | 1.8°C | 20 mm |
| March | 13°C | 0°C | 6.6°C | 22 mm |
| April | 17°C | 2°C | 9.6°C | 26 mm |
| May | 23°C | 7°C | 14.8°C | 31 mm |
| June | 27°C | 11°C | 19.1°C | 17 mm |
| July | 33°C | 15°C | 24.0°C | 4 mm |
| August | 33°C | 13°C | 22.8°C | 9 mm |
| September | 27°C | 9°C | 17.6°C | 8 mm |
| October | 19°C | 3°C | 11.1°C | 18 mm |
| November | 10°C | −2°C | 4.1°C | 19 mm |
| December | 4°C | −5°C | −0.5°C | 33 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Twin Falls (6 mi E) (6 miles away), gets 24 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00109293; 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 Twin Falls-KMVT?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (3).
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 USC00109293.
When is the last frost at Twin Falls-KMVT?
In Twin Falls-KMVT, the last spring frost (32°F) comes after April 30 in half of years and after May 14 in one year in ten; the first autumn frost comes before October 9 in half of years and before September 24 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
- April 301 year in 10 after May 14; 9 in 10 after April 17
- First autumn frost, half of years before
- October 91 year in 10 before September 24; 9 in 10 before October 24
NOAA puts the median frost-free season at 161 days, and the season without a hard freeze (28°F) at 187 days.
A hard freeze (28°F) comes after April 17 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Twin Falls-KMVT in zone 6b in ZIP code 83338, the nearest ZIP area.
Frost dates for every NOAA station in Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00109293; 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 at Twin Falls-KMVT?
In a normal year in Twin Falls-KMVT, 46 days a year reach 90°F (5 of them 100°F or more), 140 nights fall to 32°F or colder and 71 days bring measurable precipitation.
- Days at 90°F or more
- 46a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 140a normal year
- Days that stay below freezing
- 18high of 32°F or less
- Days with 0.01 inch of precipitation
- 71a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00109293.
How sunny is it at Twin Falls-KMVT?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds at Twin Falls-KMVT, 4.6 kWh per square metre a day. July is the sunniest month (90%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 1.9 |
| February | 69% | 2.8 |
| March | 72% | 4.0 |
| April | 76% | 5.5 |
| May | 80% | 6.7 |
| June | 86% | 7.6 |
| July | 90% | 7.6 |
| August | 89% | 6.6 |
| September | 87% | 5.3 |
| October | 82% | 3.6 |
| November | 73% | 2.2 |
| December | 62% | 1.5 |
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 Twin Falls-KMVT record?
A normal year at Twin Falls-KMVT brings 5,655 heating degree days, 5% more than the median U.S. place (5,373), and 795 cooling degree days, 12% 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 2,921 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,042 | 0 |
| February | 836 | 0 |
| March | 654 | 0 |
| April | 476 | 2 |
| May | 226 | 32 |
| June | 69 | 110 |
| July | 7 | 322 |
| August | 13 | 261 |
| September | 105 | 64 |
| October | 408 | 4 |
| November | 769 | 0 |
| December | 1,051 | 0 |
| Year (annual) | 5,655 | 795 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00109293. 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 Twin Falls-KMVT's climate compare?
Twin Falls-KMVT is warmer than 74 of the 85 places with their own NOAA record in Idaho, and wetter than 5. Across the 7,247 U.S. stations with normals, its annual mean of 51.6°F is warmer than 48%.
In the Köppen classification computed from these normals, Twin Falls-KMVT 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 Twin Falls-KMVT share this climate record?
2 places have no NOAA station with 1991-2020 normals of their 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.
- Kimberly, ID5,592 people · 5 mi SE
- Hansen, ID1,118 people · 9 mi SE
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 Twin Falls-KMVT's climate
What is the coldest month at Twin Falls-KMVT?
December, with a normal high of 40°F and a normal low of 23°F. The warmest is July (92°F by day, 58°F at night).
Does it snow at Twin Falls-KMVT?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Twin Falls (6 mi E) (6 miles away), records 24 inches of snow in a normal year.
What is the rainiest month at Twin Falls-KMVT?
December, with 1.31 in of precipitation in a normal year; the driest is July with 0.16 in.
What plant hardiness zone is Twin Falls-KMVT in?
The USDA's 2023 map puts Twin Falls-KMVT in zone 6b in ZIP code 83338, the nearest ZIP area.
How late can frost come at Twin Falls-KMVT?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 14. Waiting until May 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Twin Falls, ID7 miles from this station, 49.1°F a year
- Jerome, ID10 miles from this station, 50.2°F a year
- Buhl, ID15 miles from this station, 50.2°F a year
- Hazelton, ID16 miles from this station, 48.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made