Shelley weather by month
What a typical year looks like in Shelley, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Idaho Falls FAA Airport, 16 km from Shelley; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 10.1 in256 mm
- Snow a year
- Rare
- Last spring freeze
- May 25
- First fall freeze
- Sep 13
- Heating degree days
- 7,791
- Cooling degree days
- 248
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −10°−23° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Shelley in January
Highs average 29°−2° and lows 12°−11°, with 0.67 in17 mm of precipitation in a typical January.
- Record high
- 57°14° (2003)
- Record low
- −33°−36° (1963)
- Heating degree days
- 1383
- Cooling degree days
- 0
Shelley in February
Highs average 34°1° and lows 16°−9°, with 0.56 in14 mm of precipitation in a typical February.
- Record high
- 62°17° (2015)
- Record low
- −38°−39° (1985)
- Heating degree days
- 1121
- Cooling degree days
- 0
Shelley in March
Highs average 47°8° and lows 25°−4°, with 0.81 in21 mm of precipitation in a typical March.
- Record high
- 78°26° (2026)
- Record low
- −16°−27° (1960)
- Heating degree days
- 891
- Cooling degree days
- 0
Shelley in April
Highs average 58°14° and lows 31°0°, with 1 in26 mm of precipitation in a typical April.
- Record high
- 86°30° (2012)
- Record low
- 13°−11° (1968)
- Heating degree days
- 616
- Cooling degree days
- 0
Shelley in May
Highs average 67°20° and lows 38°4°, with 1.6 in40 mm of precipitation in a typical May.
- Record high
- 94°34° (2003)
- Record low
- 17°−8° (1982)
- Heating degree days
- 380
- Cooling degree days
- 2
Shelley in June
Highs average 76°25° and lows 45°7°, with 1.1 in28 mm of precipitation in a typical June.
- Record high
- 102°39° (1988)
- Record low
- 29°−2° (1951)
- Heating degree days
- 162
- Cooling degree days
- 24
Shelley in July
Highs average 87°30° and lows 49°10°, with 0.46 in12 mm of precipitation in a typical July.
- Record high
- 103°39° (2026)
- Record low
- 33°1° (1986)
- Heating degree days
- 29
- Cooling degree days
- 120
Shelley in August
Highs average 86°30° and lows 48°9°, with 0.59 in15 mm of precipitation in a typical August.
- Record high
- 101°38° (2026)
- Record low
- 28°−2° (1992)
- Heating degree days
- 42
- Cooling degree days
- 90
Shelley in September
Highs average 75°24° and lows 41°5°, with 0.97 in25 mm of precipitation in a typical September.
- Record high
- 100°38° (2022)
- Record low
- 18°−8° (1983)
- Heating degree days
- 231
- Cooling degree days
- 12
Shelley in OctoberThis month
Highs average 59°15° and lows 31°−1°, with 0.88 in22 mm of precipitation in a typical October.
- Record high
- 88°31° (2010)
- Record low
- −3°−19° (2019)
- Heating degree days
- 622
- Cooling degree days
- 0
Shelley in November
Highs average 43°6° and lows 22°−6°, with 0.66 in17 mm of precipitation in a typical November.
- Record high
- 71°22° (2014)
- Record low
- −19°−28° (1975)
- Heating degree days
- 976
- Cooling degree days
- 0
Shelley in December
Highs average 30°−1° and lows 13°−10°, with 0.78 in20 mm of precipitation in a typical December.
- Record high
- 58°14° (2014)
- Record low
- −31°−35° (1972)
- Heating degree days
- 1338
- Cooling degree days
- 0