Downey, Idaho climate: Normal weather by month, frost dates and records
Downey's normal year runs from 14°F January nights to 89°F July afternoons, with 15.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.6°C, January lows of −10°C, July highs of 31°C, 397 mm of precipitation a year.
- NOAA stationDowney
- Station IDUSC00102667
- Location42.43°N 112.13°W
- Elevation4,865 ft (1,483 m)
- From the centerunder 1 mile
- Population580
On October 22, the normal high in Downey is 59°F and the normal low 29°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Downey.
- Jan 32° 14°
- Feb 37° 18°
- Mar 48° 25°
- Apr 58° 31°
- May 67° 38°
- Jun 78° 44°
- Jul 89° 51°
- Aug 88° 49°
- Sep 77° 41°
- Oct 62° 31°
- Nov 46° 23°
- Dec 34° 16°
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 Downey each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 14°F. The most precipitation falls in May (2.29 in), the least in July (0.96 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 14°F | 23.3°F | 1.08 | – | <1 | 31 | 9 h 20 min |
| February | 37°F | 18°F | 27.2°F | 1.06 | – | <1 | 25 | 10 h 30 min |
| March | 48°F | 25°F | 36.3°F | 1.50 | – | <1 | 25 | 11 h 50 min |
| April | 58°F | 31°F | 44.4°F | 1.54 | – | <1 | 17 | 13 h 20 min |
| May | 67°F | 38°F | 52.6°F | 2.29 | – | <1 | 6 | 14 h 30 min |
| June | 78°F | 44°F | 60.9°F | 1.30 | – | 4 | 1 | 15 h 20 min |
| July | 89°F | 51°F | 69.8°F | 0.96 | – | 17 | <1 | 15 h |
| August | 88°F | 49°F | 68.4°F | 1.01 | – | 14 | <1 | 14 h |
| September | 77°F | 41°F | 58.9°F | 1.44 | – | 2 | 3 | 12 h 30 min |
| October | 62°F | 31°F | 46.5°F | 1.31 | – | <1 | 17 | 11 h 10 min |
| November | 46°F | 23°F | 34.4°F | 1.08 | – | <1 | 26 | 9 h 50 min |
| December | 34°F | 16°F | 24.9°F | 1.07 | – | <1 | 29 | 9 h 10 min |
| Year (annual) | 60°F | 32°F | 45.6°F | 15.64 | – | 37 | 180 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −10°C | −4.8°C | 27 mm |
| February | 3°C | −8°C | −2.7°C | 27 mm |
| March | 9°C | −4°C | 2.4°C | 38 mm |
| April | 14°C | −1°C | 6.9°C | 39 mm |
| May | 19°C | 3°C | 11.4°C | 58 mm |
| June | 26°C | 7°C | 16.1°C | 33 mm |
| July | 31°C | 11°C | 21.0°C | 24 mm |
| August | 31°C | 9°C | 20.2°C | 26 mm |
| September | 25°C | 5°C | 14.9°C | 37 mm |
| October | 17°C | 0°C | 8.1°C | 33 mm |
| November | 8°C | −5°C | 1.3°C | 27 mm |
| December | 1°C | −9°C | −3.9°C | 27 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, McCammon (16 miles away), gets 45 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102667; 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 Downey?
Normal highs sit between 65°F and 85°F in May, June and September.
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 USC00102667.
When is the last frost in Downey?
In Downey, the last spring frost (32°F) comes after May 31 in half of years and after June 16 in one year in ten; the first autumn frost comes before September 18 in half of years and before September 3 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
- May 311 year in 10 after June 16; 9 in 10 after May 13
- First autumn frost, half of years before
- September 181 year in 10 before September 3; 9 in 10 before October 5
NOAA puts the median frost-free season at 110 days, and the season without a hard freeze (28°F) at 144 days.
A hard freeze (28°F) comes after May 9 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Downey in zone 6b in ZIP code 83234, 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 USC00102667; 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 Downey?
In a normal year in Downey, 37 days a year reach 90°F and 180 nights fall to 32°F or colder.
- Days at 90°F or more
- 37a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 180a normal year
- Days that stay below freezing
- 40high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00102667.
How sunny is Downey?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Downey, 4.5 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.9 |
| February | 68% | 2.8 |
| March | 71% | 4.0 |
| April | 72% | 5.3 |
| May | 77% | 6.5 |
| June | 84% | 7.5 |
| July | 88% | 7.5 |
| August | 88% | 6.6 |
| September | 85% | 5.2 |
| October | 79% | 3.5 |
| November | 69% | 2.1 |
| December | 60% | 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 much heating and cooling does Downey need?
A normal year in Downey brings 7,390 heating degree days, 38% more than the median U.S. place (5,373), and 353 cooling degree days, 61% 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 2,011 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,294 | 0 |
| February | 1,060 | 0 |
| March | 890 | 0 |
| April | 618 | 0 |
| May | 386 | 1 |
| June | 154 | 30 |
| July | 21 | 170 |
| August | 26 | 129 |
| September | 206 | 22 |
| October | 576 | 1 |
| November | 918 | 0 |
| December | 1,243 | 0 |
| Year (annual) | 7,390 | 353 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102667. 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 Downey been warmer than normal lately?
2025 averaged 48.0°F, 2.4°F above the 1991-2020 normal of 45.6°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.0°F | +1.4°F | 12.53 |
| 2022 | 43.7°F | −1.9°F | 11.45 |
| 2023 | 43.8°F | −1.8°F | 18.15 |
| 2024 | 47.3°F | +1.6°F | 12.09 |
| 2025 | 48.0°F | +2.4°F | 11.55 |
Source: observed years: ACIS, station USC00102667. A year counts only with all twelve months complete.
How does Downey's climate compare?
Downey is warmer than 34 of the other 84 places with their own NOAA record in Idaho, and wetter than 43. Across the 7,247 U.S. stations with normals, its annual mean of 45.6°F is warmer than 22%.
In the Köppen classification computed from these normals, Downey 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.
Which places near Downey share this climate record?
Oxford has no NOAA station with 1991-2020 normals of its 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.
- Oxford, ID43 people · 13 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 Downey's climate
What is the coldest month in Downey?
January, with a normal high of 32°F and a normal low of 14°F. The warmest is July (89°F by day, 51°F at night).
Does it snow in Downey?
Yes. NOAA publishes no 1991-2020 snowfall normal for Downey's NOAA station; the nearest record that keeps one, McCammon (16 miles away), records 45 inches of snow in a normal year.
What is the rainiest month in Downey?
May, with 2.29 in of precipitation in a normal year; the driest is July with 0.96 in.
What plant hardiness zone is Downey in?
The USDA's 2023 map puts Downey in zone 6b in ZIP code 83234, the nearest ZIP area.
How late can frost come in Downey?
In half of years the last 32°F night comes after May 31; 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
- Idaho climateThe statewide normals and every place in the state
- Lava Hot Springs, ID15 miles from this station, 45.0°F a year
- McCammon, ID16 miles from this station, 46.1°F a year
- Malad City, ID21 miles from this station, 46.8°F a year
- Grace, ID23 miles from this station, 43.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made