Fenn Ranger Station, Idaho climate: Climate normals at a NOAA weather station
Fenn Ranger Station's normal year runs from 27°F December nights to 90°F July afternoons, with 40.6 inches of precipitation and 43 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.9°C, December lows of −3°C, July highs of 32°C, 1,031 mm of precipitation a year.
- NOAA stationFenn Ranger Station
- Station IDUSC00103143
- Location46.09°N 115.54°W
- Elevation1,560 ft (476 m)
On October 22, the normal high in Fenn Ranger Station is 57°F and the normal low 36°F, and the chance of measurable rain or snow is 46%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Fenn Ranger Station.
- Jan 37° 26°
- Feb 43° 28°
- Mar 52° 31°
- Apr 62° 36°
- May 72° 42°
- Jun 78° 48°
- Jul 90° 53°
- Aug 90° 52°
- Sep 78° 45°
- Oct 61° 38°
- Nov 45° 31°
- Dec 36° 27°
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 Fenn Ranger Station each month?
July is the warmest month, with normal highs of 90°F; December the coldest, with normal lows of 27°F. The most precipitation falls in November (5.15 in), the least in August (0.86 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 26°F | 31.4°F | 4.91 | 13.3 | 17 | <1 | 28 | 9 h |
| February | 43°F | 28°F | 35.1°F | 3.72 | 6.8 | 16 | <1 | 23 | 10 h 20 min |
| March | 52°F | 31°F | 41.7°F | 4.32 | 2.7 | 18 | <1 | 18 | 11 h 50 min |
| April | 62°F | 36°F | 48.7°F | 4.05 | 0.3 | 17 | <1 | 7 | 13 h 30 min |
| May | 72°F | 42°F | 57.2°F | 3.59 | 0.0 | 15 | 2 | 1 | 15 h |
| June | 78°F | 48°F | 63.3°F | 3.67 | 0.0 | 13 | 4 | <1 | 15 h 40 min |
| July | 90°F | 53°F | 71.7°F | 0.88 | 0.0 | 5 | 18 | <1 | 15 h 30 min |
| August | 90°F | 52°F | 70.6°F | 0.86 | 0.0 | 5 | 17 | <1 | 14 h 10 min |
| September | 78°F | 45°F | 61.3°F | 1.62 | 0.0 | 6 | 2 | <1 | 12 h 40 min |
| October | 61°F | 38°F | 49.1°F | 3.13 | 0.0 | 13 | <1 | 5 | 11 h |
| November | 45°F | 31°F | 37.9°F | 5.15 | 3.0 | 17 | <1 | 15 | 9 h 30 min |
| December | 36°F | 27°F | 31.2°F | 4.70 | 17.0 | 19 | <1 | 27 | 8 h 40 min |
| Year (annual) | 62°F | 38°F | 49.9°F | 40.60 | 43.1 | 161 | 43 | 124 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −3°C | −0.3°C | 125 mm | 34 cm |
| February | 6°C | −2°C | 1.7°C | 94 mm | 17 cm |
| March | 11°C | 0°C | 5.4°C | 110 mm | 7 cm |
| April | 16°C | 2°C | 9.3°C | 103 mm | 1 cm |
| May | 22°C | 6°C | 14.0°C | 91 mm | 0 cm |
| June | 26°C | 9°C | 17.4°C | 93 mm | 0 cm |
| July | 32°C | 12°C | 22.1°C | 22 mm | 0 cm |
| August | 32°C | 11°C | 21.4°C | 22 mm | 0 cm |
| September | 25°C | 7°C | 16.3°C | 41 mm | 0 cm |
| October | 16°C | 3°C | 9.5°C | 80 mm | 0 cm |
| November | 7°C | 0°C | 3.3°C | 131 mm | 8 cm |
| December | 2°C | −3°C | −0.4°C | 119 mm | 43 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00103143; 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 Fenn Ranger Station?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (6).
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 USC00103143.
When is the last frost at Fenn Ranger Station?
In Fenn Ranger Station, the last spring frost (32°F) comes after April 26 in half of years and after May 9 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 1 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 261 year in 10 after May 9; 9 in 10 after April 8
- First autumn frost, half of years before
- October 201 year in 10 before October 1; 9 in 10 before November 5
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 216 days.
A hard freeze (28°F) comes after March 31 in half of springs and before November 3 in half of autumns.
By the USDA's method, the average of each year's coldest night over 1991-2020, the station is in plant hardiness zone 7b: the coldest night of a typical year reaches 6°F (19 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 USC00103143; 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 Fenn Ranger Station?
In a normal year in Fenn Ranger Station, 43 days a year reach 90°F (6 of them 100°F or more), 124 nights fall to 32°F or colder and 161 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 6a normal year
- Nights at 32°F or colder
- 124a normal year
- Days that stay below freezing
- 15high of 32°F or less
- Days with 0.01 inch of precipitation
- 161a normal year
- Days with 1 inch of snow or more
- 15a normal year
The highest temperature in this station's record (since 1939) is 110°F, on June 29, 2015; the lowest is −12°F, on January 1, 1979.
The wettest calendar year on that record is 2017, with 51.03 in; the snowiest season is 1948–49, with 124.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00103143; records: ACIS (NOAA Regional Climate Centers), station USC00103143. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Fenn Ranger Station?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds at Fenn Ranger Station, 3.8 kWh per square metre a day. July is the sunniest month (89%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.3 |
| February | 58% | 2.0 |
| March | 59% | 3.1 |
| April | 64% | 4.4 |
| May | 68% | 5.6 |
| June | 73% | 6.4 |
| July | 89% | 7.4 |
| August | 86% | 6.2 |
| September | 79% | 4.4 |
| October | 67% | 2.6 |
| November | 56% | 1.4 |
| December | 52% | 1.0 |
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 Fenn Ranger Station record?
A normal year at Fenn Ranger Station brings 5,979 heating degree days, 11% more than the median U.S. place (5,373), and 514 cooling degree days, 43% 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 2,426 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,042 | 0 |
| February | 837 | 0 |
| March | 722 | 0 |
| April | 488 | 0 |
| May | 255 | 13 |
| June | 105 | 55 |
| July | 14 | 222 |
| August | 17 | 191 |
| September | 143 | 34 |
| October | 491 | 0 |
| November | 815 | 0 |
| December | 1,049 | 0 |
| Year (annual) | 5,979 | 514 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00103143. 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 Fenn Ranger Station been warmer than normal?
Over 61 complete years from 1909 to 2018, the station's annual mean temperature rose at a fitted 1.3°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Fenn Ranger Station's climate compare?
Fenn Ranger Station is warmer than 67 of the 85 places with their own NOAA record in Idaho, and wetter than 78. Across the 7,247 U.S. stations with normals, its annual mean of 49.9°F is warmer than 40%.
In the Köppen classification computed from these normals, Fenn Ranger Station is Dsa: continental, 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 Fenn Ranger Station's climate
What is the coldest month at Fenn Ranger Station?
December, with a normal high of 36°F and a normal low of 27°F. The warmest is July (90°F by day, 53°F at night).
Does it snow at Fenn Ranger Station?
Yes: 43 inches in a normal year, falling on 21 days with 0.1 inch or more, the most in December (17.0 inches).
What is the rainiest month at Fenn Ranger Station?
November, with 5.15 in of precipitation in a normal year; the driest is August with 0.86 in.
What plant hardiness zone is Fenn Ranger Station in?
By the same method at the station, the coldest night of a typical year reaches 6°F (19 years, 1991-2020): zone 7b.
How late can frost come at Fenn Ranger Station?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 9. Waiting until May 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Lowell Three Rivers, ID4 miles from this station, 51.8°F a year
- Elk City, ID18 miles from this station, 42.2°F a year
- Kooskia, ID19 miles from this station, 49.2°F a year
- Kamiah, ID25 miles from this station, 50.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made