Climate almanac

Sandown

New Hampshire, United States · 42.93°, -71.19°

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What is the climate like in Sandown?

The best time to visit Sandown is typically August – September, with trip comfort peaking in September (7.0/10). Sandown is warmest in July, when daily highs average 85°F (29°C), and coolest in January, when lows fall to about 21°F (-6°C). The wettest month is typically December and the driest is September; the year sees roughly 44 in (1124 mm) of precipitation.

  • Best time to visitAugust – September — comfort peaks in September (7.0/10)
  • Warmest monthJuly — average high 85°F (29°C)
  • Coolest monthJanuary — average low 21°F (-6°C)
  • Wettest monthDecember (4.9 in (125 mm))
  • Driest monthSeptember (3.0 in (75 mm))
  • Annual precipitation44 in (1124 mm)
  • Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
  • Records fromHaverhill, 22 km away (1899-2026)