Nantucket Mem, MA Climate

Climate Insight: Nantucket Mem, MA

The NOAA 1991–2020 climate normals describe Nantucket Mem, Massachusetts as a location with an annual average temperature of 51°F, ranging from a mean daily high of 57°F to a mean daily low of 44°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from station USW00014756, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.

Nantucket Mem averages 40.9 inches of precipitation a year, predominantly as rainfall, and that matters as much to daily life here as temperature does. The frost-free season averages 209 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 13 and the first fall freeze near November 8. As for energy demand, 5,536 heating degree days and 343 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Nantucket Mem scores 68/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.