Boise Lucky Peak Dam, Idaho climate: Climate normals at a NOAA weather station
Boise Lucky Peak Dam's normal year runs from 25°F December nights to 93°F July afternoons, with 15.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.6°C, December lows of −4°C, July highs of 34°C, 383 mm of precipitation a year.
- NOAA stationBoise Lucky Peak Dam
- Station IDUSC00101018
- Location43.53°N 116.05°W
- Elevation2,840 ft (866 m)
On October 23, the normal high in Boise Lucky Peak Dam is 63°F and the normal low 39°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Boise Lucky Peak Dam.
- Jan 40° 26°
- Feb 46° 27°
- Mar 56° 33°
- Apr 63° 37°
- May 74° 45°
- Jun 82° 51°
- Jul 93° 59°
- Aug 91° 58°
- Sep 81° 50°
- Oct 67° 41°
- Nov 50° 32°
- Dec 40° 25°
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 Boise Lucky Peak Dam each month?
July is the warmest month, with normal highs of 93°F; December the coldest, with normal lows of 25°F. The most precipitation falls in December (2.34 in), the least in July (0.28 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 40°F | 26°F | 33.3°F | 2.02 | – | <1 | 27 | 9 h 20 min |
| February | 46°F | 27°F | 36.8°F | 1.23 | – | <1 | 22 | 10 h 30 min |
| March | 56°F | 33°F | 44.4°F | 1.55 | – | <1 | 16 | 11 h 50 min |
| April | 63°F | 37°F | 50.2°F | 1.51 | – | <1 | 9 | 13 h 20 min |
| May | 74°F | 45°F | 59.2°F | 1.87 | – | 2 | 2 | 14 h 40 min |
| June | 82°F | 51°F | 66.3°F | 1.07 | – | 8 | <1 | 15 h 20 min |
| July | 93°F | 59°F | 75.6°F | 0.28 | – | 23 | <1 | 15 h 10 min |
| August | 91°F | 58°F | 74.5°F | 0.28 | – | 20 | <1 | 14 h |
| September | 81°F | 50°F | 65.8°F | 0.52 | – | 7 | <1 | 12 h 30 min |
| October | 67°F | 41°F | 53.9°F | 1.01 | – | 1 | 4 | 11 h 10 min |
| November | 50°F | 32°F | 40.9°F | 1.38 | – | <1 | 18 | 9 h 40 min |
| December | 40°F | 25°F | 32.3°F | 2.34 | – | <1 | 26 | 9 h |
| Year (annual) | 65°F | 40°F | 52.8°F | 15.06 | – | 60 | 125 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −3°C | 0.7°C | 51 mm |
| February | 8°C | −3°C | 2.7°C | 31 mm |
| March | 13°C | 0°C | 6.9°C | 39 mm |
| April | 17°C | 3°C | 10.1°C | 38 mm |
| May | 23°C | 7°C | 15.1°C | 47 mm |
| June | 28°C | 11°C | 19.1°C | 27 mm |
| July | 34°C | 15°C | 24.2°C | 7 mm |
| August | 33°C | 14°C | 23.6°C | 7 mm |
| September | 27°C | 10°C | 18.8°C | 13 mm |
| October | 19°C | 5°C | 12.2°C | 26 mm |
| November | 10°C | 0°C | 4.9°C | 35 mm |
| December | 4°C | −4°C | 0.2°C | 59 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Boise (10 miles away), gets 18 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00101018; 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 Boise Lucky Peak Dam?
Normal highs sit between 65°F and 85°F in May, June, September and October.
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 USC00101018.
When is the last frost at Boise Lucky Peak Dam?
In Boise Lucky Peak Dam, the last spring frost (32°F) comes after April 30 in half of years and after May 18 in one year in ten; the first autumn frost comes before October 22 in half of years and before September 30 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 18; 9 in 10 after April 11
- First autumn frost, half of years before
- October 221 year in 10 before September 30; 9 in 10 before November 6
NOAA puts the median frost-free season at 173 days, and the season without a hard freeze (28°F) at 202 days.
A hard freeze (28°F) comes after April 9 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Boise Lucky Peak Dam in zone 7a in ZIP code 83712, 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 USC00101018; 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 Boise Lucky Peak Dam?
In a normal year in Boise Lucky Peak Dam, 60 days a year reach 90°F (11 of them 100°F or more) and 125 nights fall to 32°F or colder.
- Days at 90°F or more
- 60a normal year
- Days at 100°F or more
- 11a normal year
- Nights at 32°F or colder
- 125a normal year
- Days that stay below freezing
- 12high of 32°F or less
The highest temperature in this station's record (since 1951) is 112°F, on July 19, 1960; the lowest is −17°F, on February 5, 1989.
The wettest calendar year on that record is 2010, with 20.90 in; the snowiest season is 2022–23, with 36.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00101018; records: ACIS (NOAA Regional Climate Centers), station USC00101018. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Boise Lucky Peak Dam?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds at Boise Lucky Peak Dam, 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 many heating and cooling degree days does Boise Lucky Peak Dam record?
A normal year at Boise Lucky Peak Dam brings 5,360 heating degree days, 0% fewer than the median U.S. place (5,373), and 926 cooling degree days, 2% more 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 3,133 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 983 | 0 |
| February | 789 | 0 |
| March | 639 | 0 |
| April | 444 | 2 |
| May | 219 | 37 |
| June | 79 | 118 |
| July | 10 | 338 |
| August | 12 | 305 |
| September | 89 | 111 |
| October | 360 | 14 |
| November | 723 | 0 |
| December | 1,013 | 0 |
| Year (annual) | 5,360 | 926 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00101018. 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 Boise Lucky Peak Dam been warmer than normal?
2025 averaged 55.0°F, 2.2°F above the 1991-2020 normal of 52.8°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 54.3°F | +1.5°F | – |
| 2022 | 51.8°F | −1.0°F | 17.40 |
| 2023 | 52.7°F | −0.1°F | 14.89 |
| 2024 | 53.7°F | +0.9°F | 17.97 |
| 2025 | 55.0°F | +2.2°F | 19.37 |
Source: observed years: ACIS, station USC00101018. A year counts only with all twelve months complete.
How does Boise Lucky Peak Dam's climate compare?
Boise Lucky Peak Dam is warmer than 79 of the 85 places with their own NOAA record in Idaho, and wetter than 42. Across the 7,247 U.S. stations with normals, its annual mean of 52.8°F is warmer than 53%.
In the Köppen classification computed from these normals, Boise Lucky Peak Dam is Csa: temperate, dry-summer, hot 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 Boise Lucky Peak Dam's climate
What is the coldest month at Boise Lucky Peak Dam?
December, with a normal high of 40°F and a normal low of 25°F. The warmest is July (93°F by day, 59°F at night).
Does it snow at Boise Lucky Peak Dam?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Boise (10 miles away), records 18 inches of snow in a normal year.
What is the rainiest month at Boise Lucky Peak Dam?
December, with 2.34 in of precipitation in a normal year; the driest is July with 0.28 in.
What plant hardiness zone is Boise Lucky Peak Dam in?
The USDA's 2023 map puts Boise Lucky Peak Dam in zone 7a in ZIP code 83712, the nearest ZIP area.
How late can frost come at Boise Lucky Peak Dam?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 18. Waiting until May 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Arrowrock Dam, ID8 miles from this station, 51.0°F a year
- Boise, ID10 miles from this station, 53.2°F a year
- Idaho City, ID24 miles from this station, 43.8°F a year
- Swan Falls Powerhouse, ID25 miles from this station, 55.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made