Photo: I, the copyright holder of this work, hereby publish it under the following license: · CC BY-SA 3.0Brockton sits near the bottom of U.S. towns for winter warmth
Sunny July days climb to about 86°. The wettest month is June; the driest is February. It is a dry place: less rain and snow fall here than on 94% of U.S. towns. The heating season runs October to April: each of those months averages under 50°.
A year in Brockton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Brockton’s climate
Compared with towns across the U.S., with Brockton’s place in Montana beside it.
What a year in Brockton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 120 frost-free days a year
In half of years the last 32° night comes by May 21 and the first by September 20. Day counts come from NOAA’s station at Wolf Point 29 Ene, MT, 14 miles from the town’s center, at about the same height; frost dates and degree days from Culbertson, MT, 18 miles away.
The 2023 USDA map puts Brockton’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −30°. 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 14 inches of rain a year
June is the wettest month and February the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Brockton
94% 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 Culbertson, MT.
Living with Brockton’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
120 frost-free days in zone 4a. The last frost comes by May 21 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 20.
Months with highs of 62–84° and lows of 40° or more: May, June and September.
Parks & trails →Cold waves are 65% of the yearly building losses FEMA expects in Brockton from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Brockton and similar climates
TownRatings has no climate map of the towns around Brockton yet.
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 Brockton averaged 1.5° warmer than the 1900s. The biggest change is in January (+4.3°).
A bigger shift than in 62% 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 Brockton compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Brockton’s place among Montana’s.
Brockton weather by month
Highs, lows and precipitation from NOAA’s grid at Brockton’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 23° | 2° | 0.4" | 0° – 28° |
| February | 29° | 7° | 0.3" | −5° – 31° |
| March | 43° | 18° | 0.6" | 15° – 43° |
| April | 58° | 30° | 1.0" | 36° – 49° |
| May | 69° | 41° | 2.4" | 50° – 61° |
| June | 78° | 51° | 2.9" | 59° – 69° |
| July | 86° | 56° | 2.3" | 63° – 77° |
| August | 85° | 54° | 1.3" | 64° – 75° |
| September | 74° | 44° | 1.2" | 54° – 65° |
| October | 57° | 31° | 1.0" | 35° – 50° |
| November | 40° | 18° | 0.4" | 16° – 40° |
| December | 27° | 7° | 0.4" | 5° – 27° |
| Year | 56° | 30° | 14.1" |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from -5° to 31°. June is the most reliable, staying within 10°.
Where Brockton’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 Brockton’s center.
- Frost dates, heating and cooling: Culbertson, MT, 18 miles away.
- Freezing nights, 90° and 100° days: Wolf Point 29 Ene, MT, 14 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 Brockton’s climate
What is the weather like in Brockton?
A typical July afternoon reaches 86°, a January night drops to 2°. Colder January nights than all but 83 U.S. towns; hotter July afternoons than 53% of U.S. towns.
How cold does it get in Brockton in winter?
January nights average 2°. About 206 nights a year reach 32° or below and 47 reach 0° or below. In the coldest January of the last 30 years the month averaged 0°.
How hot does it get in Brockton?
July, with a typical high of 86° and a low of 56°. About 23 days a year reach 90° and 3 reach 100° (Culbertson, MT).
When is the first and last frost in Brockton?
In half of years the last spring frost (32°) comes by May 21 and the first fall frost by September 20, about 120 frost-free days, at Culbertson, MT.
What growing zone is Brockton in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −30°.
What is the best time of year to visit Brockton?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Brockton getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 62% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Brockton.
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.