Hillsborough weather by month
What a typical year looks like in Hillsborough, New Hampshire: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Hopkinton Lake, 15 km from Hillsborough; records cover 2000–2026.
The year at a glance
- Precipitation a year
- 48 in1220 mm
- Snow a year
- Rare
- Last spring freeze
- May 9
- First fall freeze
- Oct 3
- Heating degree days
- 7,216
- Cooling degree days
- 429
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Hillsborough in January
Highs average 32°0° and lows 13°−11°, with 3.3 in84 mm of precipitation in a typical January.
- Record high
- 65°18° (2008)
- Record low
- −20°−29° (2009)
- Heating degree days
- 1325
- Cooling degree days
- 0
Hillsborough in February
Highs average 36°2° and lows 11°−12°, with 3.1 in78 mm of precipitation in a typical February.
- Record high
- 73°23° (2018)
- Record low
- −20°−29° (2003)
- Heating degree days
- 1166
- Cooling degree days
- 0
Hillsborough in March
Highs average 43°6° and lows 20°−7°, with 3.8 in95 mm of precipitation in a typical March.
- Record high
- 84°29° (2012)
- Record low
- −11°−24° (2014)
- Heating degree days
- 1031
- Cooling degree days
- 0
Hillsborough in April
Highs average 57°14° and lows 32°0°, with 3.9 in98 mm of precipitation in a typical April.
- Record high
- 93°34° (2002)
- Record low
- 2°−17° (2016)
- Heating degree days
- 623
- Cooling degree days
- 0
Hillsborough in May
Highs average 69°20° and lows 43°6°, with 3.7 in93 mm of precipitation in a typical May.
- Record high
- 95°35° (2010)
- Record low
- 25°−4° (2005)
- Heating degree days
- 298
- Cooling degree days
- 11
Hillsborough in June
Highs average 77°25° and lows 52°11°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 98°37° (2008)
- Record low
- 32°0° (2012)
- Heating degree days
- 84
- Cooling degree days
- 73
Hillsborough in July
Highs average 83°28° and lows 58°14°, with 4.3 in109 mm of precipitation in a typical July.
- Record high
- 101°38° (2010)
- Record low
- 42°6° (2012)
- Heating degree days
- 11
- Cooling degree days
- 174
Hillsborough in August
Highs average 81°27° and lows 56°13°, with 4 in102 mm of precipitation in a typical August.
- Record high
- 99°37° (2002)
- Record low
- 38°3° (2007)
- Heating degree days
- 24
- Cooling degree days
- 126
Hillsborough in September
Highs average 74°23° and lows 47°8°, with 4 in102 mm of precipitation in a typical September.
- Record high
- 96°36° (2002)
- Record low
- 28°−2° (2012)
- Heating degree days
- 175
- Cooling degree days
- 43
Hillsborough in OctoberThis month
Highs average 60°16° and lows 37°3°, with 5.4 in138 mm of precipitation in a typical October.
- Record high
- 86°30° (2007)
- Record low
- 12°−11° (2011)
- Heating degree days
- 516
- Cooling degree days
- 2
Hillsborough in November
Highs average 47°9° and lows 28°−2°, with 3.9 in98 mm of precipitation in a typical November.
- Record high
- 77°25° (2020)
- Record low
- 2°−17° (2013)
- Heating degree days
- 816
- Cooling degree days
- 0
Hillsborough in December
Highs average 37°3° and lows 19°−7°, with 4.3 in109 mm of precipitation in a typical December.
- Record high
- 66°19° (2001)
- Record low
- −11°−24° (2005)
- Heating degree days
- 1147
- Cooling degree days
- 0