Photo: John Phelan · CC BY-SA 4.0Nights turn raw in South Lancaster each January, colder than in 82% of U.S. towns
The warmest part of a July day comes in at 84° on average. Its yearly precipitation tops that of 76% of U.S. towns. Warming shows here too: 1.8° more than in 1901–2000, led by December. Warm coats and heating bills mark the months from November to April, when means dip under 50°.
A year in South Lancaster at a glance
Each month’s typical high and low, and what it brings.
What stands out about South Lancaster’s climate
Compared with towns across the U.S., with South Lancaster’s place in Massachusetts beside it.
What a year in South Lancaster feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 164 frost-free days a year
In half of years the last 32° night comes by April 29 and the first by October 11. Frost and day counts come from NOAA’s station at Fitchburg Muni Airport, 9 miles from the town’s center, at about the same height.
The 2023 USDA map puts South Lancaster’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −5°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 73 inches of snow a winter
Snow, measured at Worcester Rgnl Airport, falls mostly in February. Precipitation (rain plus melted snow) adds up to 48 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 138 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in South Lancaster
91% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Fitchburg Muni Airport.
Living with South Lancaster’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
164 frost-free days in zone 6a. The last frost comes by Apr 29 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 11.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 0.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in South Lancaster from natural hazards, river flooding is the largest share (45%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →South Lancaster and similar climates
TownRatings has no climate map of the towns around South Lancaster yet.
Climates most like South Lancaster’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| South Lancaster, MA | 16° | 84° | 48" | 73" |
| Johnstown, PA | 19° | 83° | 47" | 74" |
| Cortland, OH | 18° | 83° | 43" | 68" |
| Mamakating, NY | 17° | 82° | 49" | 58" |
| Elkins, WV | 21° | 82° | 50" | 69" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in South Lancaster averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.3°).
A bigger shift than in 79% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How South Lancaster compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with South Lancaster’s place among Massachusetts’.
South Lancaster weather by month
Highs, lows and precipitation from NOAA’s grid at South Lancaster’s center; snow, wet days and snow on the ground from Worcester Rgnl Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 35° | 16° | 3.5" | 18.2" | 12 | 16° – 32° |
| February | 38° | 17° | 3.2" | 21.2" | 11 | 13° – 34° |
| March | 46° | 25° | 4.2" | 13.7" | 12 | 29° – 45° |
| April | 59° | 35° | 4.2" | 1.9" | 13 | 43° – 52° |
| May | 70° | 46° | 3.8" | 0.0" | 13 | 52° – 64° |
| June | 79° | 56° | 4.3" | 0.0" | 12 | 64° – 70° |
| July | 84° | 61° | 3.7" | 0.0" | 11 | 68° – 76° |
| August | 82° | 59° | 3.9" | 0.0" | 10 | 67° – 74° |
| September | 74° | 51° | 4.1" | 0.0" | 10 | 60° – 67° |
| October | 62° | 40° | 4.9" | 1.1" | 12 | 47° – 57° |
| November | 51° | 31° | 3.9" | 1.9" | 11 | 35° – 46° |
| December | 40° | 22° | 4.4" | 14.9" | 12 | 24° – 41° |
| Year | 60° | 38° | 48.0" | 72.9" | 138 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 13° to 34°. June is the most reliable, staying within 6°.
Where South Lancaster’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at South Lancaster’s center.
- Snow: Worcester Rgnl Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Fitchburg Muni Airport, 9 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about South Lancaster’s climate
What is the weather like in South Lancaster?
A typical July afternoon reaches 84°, a January night drops to 16°, and about 73 inches of snow falls in a normal winter. Colder January nights than 82% of U.S. towns; cooler July afternoons than 63% of U.S. towns.
How cold does it get in South Lancaster in winter?
January nights average 16°. About 137 nights a year reach 32° or below and 5 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does South Lancaster get?
About 73 inches in a normal winter at Worcester Rgnl Airport, most of it in February.
How hot does it get in South Lancaster?
July, with a typical high of 84° and a low of 61°. About 15 days a year reach 90° (Fitchburg Muni Airport).
When is the first and last frost in South Lancaster?
In half of years the last spring frost (32°) comes by April 29 and the first fall frost by October 11, about 164 frost-free days, at Fitchburg Muni Airport.
What growing zone is South Lancaster in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −5°.
What is the best time of year to visit South Lancaster?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is South Lancaster getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 79% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in South Lancaster.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.