Rockland weather by month
What a typical year looks like in Rockland, Idaho: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Massacre Rocks State Park, 15 km from Rockland; records cover 1973–2026.
The year at a glance
- Precipitation a year
- 13.5 in343 mm
- Snow a year
- Rare
- Last spring freeze
- May 16
- First fall freeze
- Sep 27
- Heating degree days
- 6,900
- Cooling degree days
- 471
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −2°−19° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Rockland in January
Highs average 35°2° and lows 17°−8°, with 1.5 in38 mm of precipitation in a typical January.
- Record high
- 60°16° (1994)
- Record low
- −30°−34° (1984)
- Heating degree days
- 1207
- Cooling degree days
- 0
Rockland in February
Highs average 39°4° and lows 21°−6°, with 1.1 in27 mm of precipitation in a typical February.
- Record high
- 71°22° (1995)
- Record low
- −24°−31° (1985)
- Heating degree days
- 977
- Cooling degree days
- 0
Rockland in March
Highs average 51°11° and lows 27°−3°, with 1.3 in34 mm of precipitation in a typical March.
- Record high
- 80°27° (2026)
- Record low
- −10°−23° (1993)
- Heating degree days
- 801
- Cooling degree days
- 0
Rockland in April
Highs average 59°15° and lows 33°0°, with 1.6 in41 mm of precipitation in a typical April.
- Record high
- 90°32° (1992)
- Record low
- 15°−9° (1983)
- Heating degree days
- 581
- Cooling degree days
- 0
Rockland in May
Highs average 68°20° and lows 39°4°, with 1.6 in40 mm of precipitation in a typical May.
- Record high
- 98°37° (2003)
- Record low
- 15°−9° (1982)
- Heating degree days
- 357
- Cooling degree days
- 5
Rockland in June
Highs average 78°26° and lows 46°8°, with 1 in25 mm of precipitation in a typical June.
- Record high
- 106°41° (2015)
- Record low
- 29°−2° (1995)
- Heating degree days
- 136
- Cooling degree days
- 51
Rockland in July
Highs average 89°32° and lows 53°12°, with 0.45 in11 mm of precipitation in a typical July.
- Record high
- 107°42° (2002)
- Record low
- 30°−1° (1987)
- Heating degree days
- 18
- Cooling degree days
- 201
Rockland in August
Highs average 88°31° and lows 52°11°, with 0.58 in15 mm of precipitation in a typical August.
- Record high
- 108°42° (1990)
- Record low
- 31°−1° (1992)
- Heating degree days
- 24
- Cooling degree days
- 177
Rockland in September
Highs average 77°25° and lows 43°6°, with 0.88 in22 mm of precipitation in a typical September.
- Record high
- 103°39° (2022)
- Record low
- 21°−6° (1983)
- Heating degree days
- 182
- Cooling degree days
- 35
Rockland in OctoberThis month
Highs average 62°17° and lows 34°1°, with 1.1 in27 mm of precipitation in a typical October.
- Record high
- 92°33° (2003)
- Record low
- 4°−16° (2020)
- Heating degree days
- 529
- Cooling degree days
- 2
Rockland in November
Highs average 47°8° and lows 24°−4°, with 1.1 in29 mm of precipitation in a typical November.
- Record high
- 77°25° (1988)
- Record low
- −8°−22° (1976)
- Heating degree days
- 888
- Cooling degree days
- 0
Rockland in December
Highs average 35°2° and lows 18°−8°, with 1.4 in34 mm of precipitation in a typical December.
- Record high
- 67°19° (1995)
- Record low
- −26°−32° (1990)
- Heating degree days
- 1200
- Cooling degree days
- 0