Lynn, MA climate
Lynn has chilly, snowy winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 81°, a January night drops to 20°, and about 39 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Lynn feels like
Winter
Spring
Summer
Fall
Lynn weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 20° | 3.7" | 13.3" | 10 | 13 | 19° – 35° |
| February | 38° | 21° | 3.5" | 8.5" | 9 | 11 | 17° – 36° |
| March | 45° | 28° | 4.6" | 7.5" | 10 | 8 | 31° – 45° |
| April | 57° | 38° | 4.2" | 1.5" | 11 | 1 | 43° – 52° |
| May | 67° | 47° | 3.6" | 0 | 11 | 0 | 51° – 62° |
| June | 76° | 57° | 4.2" | 0 | 10 | 0 | 62° – 69° |
| July | 81° | 63° | 3.6" | 0 | 9 | 0 | 67° – 75° |
| August | 80° | 61° | 3.6" | 0 | 8 | 0 | 68° – 74° |
| September | 73° | 54° | 3.8" | 0 | 8 | 0 | 60° – 68° |
| October | 62° | 43° | 4.7" | 0.1" | 10 | 0 | 49° – 59° |
| November | 51° | 34° | 4.0" | 0.8" | 10 | 0 | 38° – 48° |
| December | 42° | 26° | 4.7" | 7.4" | 10 | 6 | 28° – 43° |
| Year | 59° | 41° | 48.0" | 39.1" | 115 | 39 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Lynn
Lynn gets 48 inches of rain and melted snow a year. December is the wettest month and February the driest. Rain or snow falls on about 115 days a year. Snow covers the ground about 39 days of the year.
About 176 frost-free days a year
In half of years the last 32° night comes by April 25 and the first one by October 20. That leaves about 176 frost-free days for gardens, shorter than 53% of U.S. towns.
Heating and cooling a home in Lynn
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Lynn, 93% of that work is heating and 7% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Lynn and its neighbors
Lynn borders 6 towns with climate data. January nights across them vary by 2.1°. Lynnfield has both the coldest January nights (18°) and the hottest July afternoons (83°). Lynn’s January low is 20° and its July high 81°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Lynn compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Lynn averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.5°). The shift is larger than in 91% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Lynn’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 17° to 36°. August is the most reliable, staying within 7°.
Common questions about Lynn’s climate
What is the coldest month in Lynn?
January, with a typical high of 36° and a low of 20°.
What is the hottest month in Lynn?
July, with a typical high of 81° and a low of 63°. About 9 days a year reach 90°.
How much snow does Lynn get?
About 39 inches in a normal winter, most of it in January.
When is the first frost in Lynn?
In half of years the first 32° night comes by October 20, and the last spring frost by April 25.
What is the rainiest month in Lynn?
December, with 4.7 inches of rain and melted snow. The year totals 48 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Lynn itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Marblehead, MA (5 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.