Bern, Idaho climate: Climate normals at a NOAA weather station
Bern's normal year runs from 7°F January nights to 85°F July afternoons, with 17.9 inches of precipitation and 91 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.1°C, January lows of −14°C, July highs of 29°C, 454 mm of precipitation a year.
- NOAA stationBern
- Station IDUSC00100803
- Location42.34°N 111.39°W
- Elevation5,964 ft (1,818 m)
On October 22, the normal high in Bern is 56°F and the normal low 25°F, and the chance of measurable rain or snow is 28%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Bern.
- Jan 29° 7°
- Feb 32° 9°
- Mar 42° 18°
- Apr 53° 27°
- May 64° 34°
- Jun 75° 40°
- Jul 85° 46°
- Aug 84° 45°
- Sep 74° 37°
- Oct 59° 27°
- Nov 43° 19°
- Dec 30° 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 Bern each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 7°F. The most precipitation falls in May (2.29 in), the least in July (0.67 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 29°F | 7°F | 17.7°F | 1.73 | 23.3 | 12 | <1 | 31 | 9 h 20 min |
| February | 32°F | 9°F | 20.3°F | 1.60 | 19.0 | 11 | <1 | 28 | 10 h 30 min |
| March | 42°F | 18°F | 30.2°F | 1.48 | 9.2 | 11 | <1 | 30 | 11 h 50 min |
| April | 53°F | 27°F | 40.1°F | 1.74 | 4.9 | 12 | <1 | 23 | 13 h 20 min |
| May | 64°F | 34°F | 49.3°F | 2.29 | 1.3 | 12 | <1 | 10 | 14 h 30 min |
| June | 75°F | 40°F | 57.4°F | 1.28 | 0.1 | 8 | 1 | 3 | 15 h 20 min |
| July | 85°F | 46°F | 65.4°F | 0.67 | 0.0 | 5 | 8 | <1 | 15 h |
| August | 84°F | 45°F | 64.2°F | 0.96 | 0.0 | 6 | 6 | 1 | 14 h |
| September | 74°F | 37°F | 55.0°F | 1.35 | 0.1 | 7 | <1 | 8 | 12 h 30 min |
| October | 59°F | 27°F | 42.8°F | 1.70 | 2.9 | 9 | <1 | 23 | 11 h 10 min |
| November | 43°F | 19°F | 30.6°F | 1.38 | 9.2 | 10 | <1 | 29 | 9 h 50 min |
| December | 30°F | 9°F | 19.9°F | 1.71 | 20.6 | 13 | <1 | 31 | 9 h 10 min |
| Year (annual) | 56°F | 27°F | 41.1°F | 17.89 | 90.6 | 116 | 16 | 217 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −2°C | −14°C | −7.9°C | 44 mm | 59 cm |
| February | 0°C | −13°C | −6.5°C | 41 mm | 48 cm |
| March | 6°C | −8°C | −1.0°C | 38 mm | 23 cm |
| April | 12°C | −3°C | 4.5°C | 44 mm | 12 cm |
| May | 18°C | 1°C | 9.6°C | 58 mm | 3 cm |
| June | 24°C | 5°C | 14.1°C | 33 mm | 0 cm |
| July | 29°C | 8°C | 18.6°C | 17 mm | 0 cm |
| August | 29°C | 7°C | 17.9°C | 24 mm | 0 cm |
| September | 23°C | 3°C | 12.8°C | 34 mm | 0 cm |
| October | 15°C | −3°C | 6.0°C | 43 mm | 7 cm |
| November | 6°C | −7°C | −0.8°C | 35 mm | 23 cm |
| December | −1°C | −13°C | −6.7°C | 43 mm | 52 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00100803; 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 Bern?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, July has the fewest days with rain (5).
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 USC00100803.
When is the last frost at Bern?
In Bern, the last spring frost (32°F) comes after June 17 in half of years and after July 4 in one year in ten; the first autumn frost comes before September 3 in half of years and before August 18 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 171 year in 10 after July 4; 9 in 10 after May 31
- First autumn frost, half of years before
- September 31 year in 10 before August 18; 9 in 10 before September 18
NOAA puts the median frost-free season at 77 days, and the season without a hard freeze (28°F) at 111 days.
A hard freeze (28°F) comes after May 25 in half of springs and before September 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Bern in zone 5a in ZIP code 83220, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 5a: the coldest night of a typical year reaches −19°F (25 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 USC00100803; 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 at Bern?
In a normal year in Bern, 16 days a year reach 90°F, 217 nights fall to 32°F or colder and 116 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 217a normal year
- Days that stay below freezing
- 61high of 32°F or less
- Days with 0.01 inch of precipitation
- 116a normal year
- Days with 1 inch of snow or more
- 34a normal year
The highest temperature in this station's record (since 1992) is 101°F, on July 13, 2026; the lowest is −30°F, on January 31, 2023.
The wettest calendar year on that record is 2016, with 26.05 in; the snowiest season is 2022–23, with 174.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00100803; records: ACIS (NOAA Regional Climate Centers), station USC00100803. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Bern?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Bern, 4.5 kWh per square metre a day. July is the sunniest month (89%) and December the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.9 |
| February | 66% | 2.8 |
| March | 71% | 4.1 |
| April | 72% | 5.4 |
| May | 74% | 6.3 |
| June | 83% | 7.5 |
| July | 89% | 7.6 |
| August | 88% | 6.6 |
| September | 84% | 5.2 |
| October | 76% | 3.4 |
| November | 68% | 2.1 |
| December | 61% | 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 Bern record?
A normal year at Bern brings 8,825 heating degree days, 64% more than the median U.S. place (5,373), and 139 cooling degree days, 85% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,463 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,466 | 0 |
| February | 1,252 | 0 |
| March | 1,079 | 0 |
| April | 746 | 0 |
| May | 487 | 0 |
| June | 238 | 10 |
| July | 59 | 72 |
| August | 76 | 52 |
| September | 305 | 4 |
| October | 688 | 0 |
| November | 1,032 | 0 |
| December | 1,398 | 0 |
| Year (annual) | 8,825 | 139 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00100803. 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 Bern been warmer than normal?
2025 averaged 44.2°F, 3.1°F above the 1991-2020 normal of 41.1°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 43.6°F | +2.5°F | 18.23 | 85.5 |
| 2022 | 39.8°F | −1.3°F | 17.28 | 78.5 |
| 2023 | 39.5°F | −1.6°F | 23.35 | 158.0 |
| 2024 | 42.7°F | +1.6°F | 16.29 | 114.0 |
| 2025 | 44.2°F | +3.1°F | 17.41 | 56.5 |
Source: observed years: ACIS, station USC00100803. A year counts only with all twelve months complete.
How does Bern's climate compare?
Bern is warmer than 6 of the 85 places with their own NOAA record in Idaho, and wetter than 50. Across the 7,247 U.S. stations with normals, its annual mean of 41.1°F is warmer than 8%.
In the Köppen classification computed from these normals, Bern 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 Bern share this climate record?
4 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.
- Montpelier, ID2,696 people · 4 mi E
- Paris, ID555 people · 7 mi S
- Georgetown, ID509 people · 10 mi N
- Bennington, ID120 people · 5 mi NE
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 Bern's climate
What is the coldest month at Bern?
January, with a normal high of 29°F and a normal low of 7°F. The warmest is July (85°F by day, 46°F at night).
Does it snow at Bern?
Yes: 91 inches in a normal year, falling on 50 days with 0.1 inch or more, the most in January (23.3 inches).
What is the rainiest month at Bern?
May, with 2.29 in of precipitation in a normal year; the driest is July with 0.67 in.
What plant hardiness zone is Bern in?
The USDA's 2023 map puts Bern in zone 5a in ZIP code 83220, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −19°F (25 years, 1991-2020): zone 5a.
How late can frost come at Bern?
In half of years the last 32°F night comes after June 17; in one year in ten it comes after July 4. Waiting until July 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Lifton Pumping Station, ID15 miles from this station, 41.0°F a year
- Soda Springs, ID24 miles from this station, 42.4°F a year
- Grace, ID25 miles from this station, 43.7°F a year
- Bear Lake State Park, UT25 miles from this station, 45.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made