May (2 mi SSE), Idaho climate: Climate normals at a NOAA weather station
May (2 mi SSE)'s normal year runs from 6°F January nights to 87°F July afternoons, with 8.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.8°C, January lows of −14°C, July highs of 30°C, 216 mm of precipitation a year.
- NOAA stationMay (2 mi SSE)
- Station IDUSC00105685
- Location44.57°N 113.90°W
- Elevation5,050 ft (1,539 m)
On October 22, the normal high in May (2 mi SSE) is 57°F and the normal low 23°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 May (2 mi SSE).
- Jan 32° 6°
- Feb 39° 13°
- Mar 51° 19°
- Apr 58° 25°
- May 68° 34°
- Jun 76° 41°
- Jul 87° 45°
- Aug 85° 42°
- Sep 76° 35°
- Oct 60° 25°
- Nov 44° 17°
- Dec 32° 9°
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 May (2 mi SSE) each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 6°F. The most precipitation falls in June (1.28 in), the least in February (0.26 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 6°F | 19.0°F | 0.32 | 3 | <1 | 31 | 9 h 10 min |
| February | 39°F | 13°F | 26.0°F | 0.26 | 3 | <1 | 28 | 10 h 30 min |
| March | 51°F | 19°F | 34.8°F | 0.66 | 4 | <1 | 29 | 11 h 50 min |
| April | 58°F | 25°F | 41.8°F | 0.81 | 5 | <1 | 26 | 13 h 30 min |
| May | 68°F | 34°F | 50.8°F | 1.22 | 7 | <1 | 12 | 14 h 50 min |
| June | 76°F | 41°F | 58.2°F | 1.28 | 7 | 2 | 2 | 15 h 30 min |
| July | 87°F | 45°F | 66.1°F | 0.45 | 4 | 14 | <1 | 15 h 20 min |
| August | 85°F | 42°F | 63.9°F | 0.88 | 5 | 8 | <1 | 14 h 10 min |
| September | 76°F | 35°F | 55.5°F | 0.89 | 4 | 1 | 9 | 12 h 40 min |
| October | 60°F | 25°F | 42.7°F | 0.93 | 5 | <1 | 24 | 11 h |
| November | 44°F | 17°F | 30.0°F | 0.48 | 4 | <1 | 29 | 9 h 40 min |
| December | 32°F | 9°F | 20.5°F | 0.32 | 3 | <1 | 31 | 8 h 50 min |
| Year (annual) | 59°F | 26°F | 42.4°F | 8.50 | 55 | 25 | 220 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −14°C | −7.2°C | 8 mm |
| February | 4°C | −11°C | −3.3°C | 7 mm |
| March | 10°C | −7°C | 1.6°C | 17 mm |
| April | 15°C | −4°C | 5.4°C | 21 mm |
| May | 20°C | 1°C | 10.4°C | 31 mm |
| June | 24°C | 5°C | 14.6°C | 33 mm |
| July | 30°C | 7°C | 18.9°C | 11 mm |
| August | 30°C | 6°C | 17.7°C | 22 mm |
| September | 24°C | 2°C | 13.1°C | 23 mm |
| October | 16°C | −4°C | 5.9°C | 24 mm |
| November | 6°C | −9°C | −1.1°C | 12 mm |
| December | 0°C | −13°C | −6.4°C | 8 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00105685; 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 May (2 mi SSE)?
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 USC00105685.
When is the last frost at May (2 mi SSE)?
In May (2 mi SSE), the last spring frost (32°F) comes after June 12 in half of years and after June 29 in one year in ten; the first autumn frost comes before September 6 in half of years and before August 23 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 121 year in 10 after June 29; 9 in 10 after May 24
- First autumn frost, half of years before
- September 61 year in 10 before August 23; 9 in 10 before September 20
NOAA puts the median frost-free season at 85 days, and the season without a hard freeze (28°F) at 118 days.
A hard freeze (28°F) comes after May 20 in half of springs and before September 19 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts May (2 mi SSE) in zone 5a in ZIP code 83253, 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 USC00105685; 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 May (2 mi SSE)?
In a normal year in May (2 mi SSE), 25 days a year reach 90°F, 220 nights fall to 32°F or colder and 55 days bring measurable precipitation.
- Days at 90°F or more
- 25a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 220a normal year
- Days that stay below freezing
- 43high of 32°F or less
- Days with 0.01 inch of precipitation
- 55a normal year
The highest temperature in this station's record (since 1934) is 107°F, on July 28, 1934; the lowest is −40°F, on January 8, 1937.
The wettest calendar year on that record is 1984, with 11.91 in; the snowiest season is 1957–58, with 50.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00105685; records: ACIS (NOAA Regional Climate Centers), station USC00105685. Records use complete months only; a month missing more than three days is left out.
How sunny is it at May (2 mi SSE)?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at May (2 mi SSE), 4.4 kWh per square metre a day. July is the sunniest month (84%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 1.9 |
| February | 75% | 3.0 |
| March | 75% | 4.3 |
| April | 72% | 5.3 |
| May | 71% | 6.0 |
| June | 77% | 7.0 |
| July | 84% | 7.3 |
| August | 83% | 6.2 |
| September | 81% | 4.8 |
| October | 75% | 3.2 |
| November | 70% | 2.0 |
| December | 67% | 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 May (2 mi SSE) record?
A normal year at May (2 mi SSE) brings 8,331 heating degree days, 55% more than the median U.S. place (5,373), and 134 cooling degree days, 85% 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 1,533 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,424 | 0 |
| February | 1,092 | 0 |
| March | 936 | 0 |
| April | 696 | 0 |
| May | 439 | 0 |
| June | 215 | 11 |
| July | 45 | 77 |
| August | 78 | 42 |
| September | 288 | 3 |
| October | 691 | 0 |
| November | 1,049 | 0 |
| December | 1,378 | 0 |
| Year (annual) | 8,331 | 134 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00105685. 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 May (2 mi SSE)'s climate compare?
May (2 mi SSE) is warmer than 12 of the 85 places with their own NOAA record in Idaho, and wetter than 3. Across the 7,247 U.S. stations with normals, its annual mean of 42.4°F is warmer than 10%.
In the Köppen classification computed from these normals, May (2 mi SSE) 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.
Questions about May (2 mi SSE)'s climate
What is the coldest month at May (2 mi SSE)?
January, with a normal high of 32°F and a normal low of 6°F. The warmest is July (87°F by day, 45°F at night).
What is the rainiest month at May (2 mi SSE)?
June, with 1.28 in of precipitation in a normal year; the driest is February with 0.26 in.
What plant hardiness zone is May (2 mi SSE) in?
The USDA's 2023 map puts May (2 mi SSE) in zone 5a in ZIP code 83253, the nearest ZIP area.
How late can frost come at May (2 mi SSE)?
In half of years the last 32°F night comes after June 12; in one year in ten it comes after June 29. Waiting until June 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Challis, ID16 miles from this station, 44.4°F a year
- Leadore, ID27 miles from this station, 39.1°F a year
- Chilly Barton Flat, ID41 miles from this station, 41.0°F a year
- Salmon, ID42 miles from this station, 44.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made