Emmett, Idaho climate: Normal weather by month, frost dates and records
Emmett's normal year runs from 23°F January nights to 92°F July afternoons, with 13.3 inches of precipitation and 7 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.8°C, January lows of −5°C, July highs of 33°C, 337 mm of precipitation a year.
- NOAA stationEmmett (2 mi E)
- Station IDUSC00102942
- Location43.85°N 116.47°W
- Elevation2,390 ft (729 m)
- Population8,803
On October 22, the normal high in Emmett is 62°F and the normal low 36°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Emmett.
- Jan 38° 23°
- Feb 46° 27°
- Mar 56° 32°
- Apr 63° 36°
- May 72° 44°
- Jun 81° 50°
- Jul 92° 58°
- Aug 90° 57°
- Sep 80° 48°
- Oct 65° 38°
- Nov 49° 29°
- Dec 39° 24°
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 Emmett each month?
July is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 23°F. The most precipitation falls in December (2.12 in), the least in August (0.17 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 38°F | 23°F | 30.8°F | 1.77 | 1.7 | 11 | <1 | 27 | 9 h 10 min |
| February | 46°F | 27°F | 36.3°F | 1.26 | 1.4 | 9 | <1 | 22 | 10 h 30 min |
| March | 56°F | 32°F | 43.9°F | 1.60 | 0.1 | 11 | <1 | 17 | 11 h 50 min |
| April | 63°F | 36°F | 49.3°F | 1.22 | 0.1 | 10 | <1 | 10 | 13 h 20 min |
| May | 72°F | 44°F | 57.9°F | 1.47 | 0.0 | 9 | 1 | 2 | 14 h 40 min |
| June | 81°F | 50°F | 65.6°F | 0.77 | 0.0 | 6 | 6 | <1 | 15 h 30 min |
| July | 92°F | 58°F | 74.7°F | 0.25 | 0.0 | 2 | 21 | <1 | 15 h 10 min |
| August | 90°F | 57°F | 73.5°F | 0.17 | 0.0 | 2 | 19 | <1 | 14 h |
| September | 80°F | 48°F | 64.0°F | 0.42 | 0.0 | 4 | 5 | <1 | 12 h 40 min |
| October | 65°F | 38°F | 51.6°F | 0.90 | 0.0 | 6 | <1 | 6 | 11 h 10 min |
| November | 49°F | 29°F | 39.1°F | 1.33 | 0.5 | 10 | <1 | 20 | 9 h 40 min |
| December | 39°F | 24°F | 31.2°F | 2.12 | 3.6 | 12 | <1 | 27 | 9 h |
| Year (annual) | 64°F | 39°F | 51.5°F | 13.28 | 7.4 | 91 | 51 | 131 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −5°C | −0.7°C | 45 mm | 4 cm |
| February | 8°C | −3°C | 2.4°C | 32 mm | 4 cm |
| March | 13°C | 0°C | 6.6°C | 41 mm | 0 cm |
| April | 17°C | 2°C | 9.6°C | 31 mm | 0 cm |
| May | 22°C | 6°C | 14.4°C | 37 mm | 0 cm |
| June | 27°C | 10°C | 18.7°C | 20 mm | 0 cm |
| July | 33°C | 14°C | 23.7°C | 6 mm | 0 cm |
| August | 32°C | 14°C | 23.1°C | 4 mm | 0 cm |
| September | 27°C | 9°C | 17.8°C | 11 mm | 0 cm |
| October | 18°C | 3°C | 10.9°C | 23 mm | 0 cm |
| November | 10°C | −2°C | 3.9°C | 34 mm | 1 cm |
| December | 4°C | −5°C | −0.4°C | 54 mm | 9 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102942; 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 Emmett?
Normal highs sit between 65°F and 85°F in May, June, September and October. 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 USC00102942.
When is the last frost in Emmett?
In Emmett, the last spring frost (32°F) comes after April 30 in half of years and after May 17 in one year in ten; the first autumn frost comes before October 17 in half of years and before October 2 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 17; 9 in 10 after April 17
- First autumn frost, half of years before
- October 171 year in 10 before October 2; 9 in 10 before November 1
NOAA puts the median frost-free season at 168 days, and the season without a hard freeze (28°F) at 197 days.
A hard freeze (28°F) comes after April 14 in half of springs and before October 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Emmett in zone 7a in ZIP code 83617, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Emmett's NOAA station is in zone 7a: the coldest night of a typical year reaches 4°F (29 complete years).
Frost dates for every NOAA station in Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00102942; 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 Emmett?
In a normal year in Emmett, 51 days a year reach 90°F (7 of them 100°F or more), 131 nights fall to 32°F or colder and 91 days bring measurable precipitation.
- Days at 90°F or more
- 51a normal year
- Days at 100°F or more
- 7a normal year
- Nights at 32°F or colder
- 131a normal year
- Days that stay below freezing
- 17high of 32°F or less
- Days with 0.01 inch of precipitation
- 91a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1906) is 111°F, on July 16, 1925; the lowest is −27°F, on January 21, 1930.
The wettest calendar year on that record is 1996, with 19.02 in; the snowiest season is 1915–16, with 55.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00102942; records: ACIS (NOAA Regional Climate Centers), station USC00102942. Records use complete months only; a month missing more than three days is left out.
How sunny is Emmett?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Emmett, 4.6 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.7 |
| February | 70% | 2.7 |
| March | 72% | 4.0 |
| April | 77% | 5.5 |
| May | 81% | 6.7 |
| June | 86% | 7.5 |
| July | 92% | 7.7 |
| August | 92% | 6.7 |
| September | 89% | 5.2 |
| October | 82% | 3.5 |
| November | 71% | 2.1 |
| December | 62% | 1.4 |
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 Emmett need?
A normal year in Emmett brings 5,689 heating degree days, 6% more than the median U.S. place (5,373), and 789 cooling degree days, 13% 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 2,871 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,060 | 0 |
| February | 804 | 0 |
| March | 656 | 0 |
| April | 472 | 1 |
| May | 245 | 25 |
| June | 83 | 101 |
| July | 9 | 308 |
| August | 12 | 274 |
| September | 108 | 77 |
| October | 418 | 4 |
| November | 775 | 0 |
| December | 1,048 | 0 |
| Year (annual) | 5,689 | 789 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102942. 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 Emmett been warmer than normal lately?
2025 averaged 53.2°F, 1.7°F above the 1991-2020 normal of 51.5°F. 2 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 50.4°F | −1.1°F | 13.33 | 13.4 |
| 2023 | 51.3°F | −0.2°F | 13.45 | 9.0 |
| 2024 | 52.1°F | +0.6°F | 16.60 | 22.0 |
| 2025 | 53.2°F | +1.7°F | 13.59 | 17.3 |
Over 78 complete years from 1914 to 2025, the station's annual mean temperature rose at a fitted 1.6°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00102942; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Emmett's climate compare?
Emmett is warmer than 72 of the other 84 places with their own NOAA record in Idaho, and wetter than 36. Across the 7,247 U.S. stations with normals, its annual mean of 51.5°F is warmer than 47%.
In the Köppen classification computed from these normals, Emmett 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 Emmett share this climate record?
3 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.
- Eagle, ID33,451 people · 6 mi SE
- Avimor, ID1,289 people · 12 mi SE
- Horseshoe Bend, ID830 people · 14 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 Emmett's climate
What is the coldest month in Emmett?
January, with a normal high of 38°F and a normal low of 23°F. The warmest is July (92°F by day, 58°F at night).
Does it snow in Emmett?
Yes: 7 inches in a normal year, falling on 6 days with 0.1 inch or more, the most in December (3.6 inches).
What is the rainiest month in Emmett?
December, with 2.12 in of precipitation in a normal year; the driest is August with 0.17 in.
What plant hardiness zone is Emmett in?
The USDA's 2023 map puts Emmett in zone 7a in ZIP code 83617, the nearest ZIP area. By the same method at Emmett's NOAA station, the coldest night of a typical year reaches 4°F (29 years, 1991-2020): zone 7a.
How late can frost come in Emmett?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 17. Waiting until May 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Nampa, ID18 miles from this station, 52.0°F a year
- Boise, ID23 miles from this station, 53.2°F a year
- Deer Flat Dam, ID24 miles from this station, 52.5°F a year
- Ola, ID24 miles from this station, 47.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made