Catonsville Historic District, Old · Photo: Pubdog · Public domainCatonsville gets more rain and snow than 72% of U.S. towns: 47 inches of precipitation a year
Sunny July days climb to about 88°. Only 63° separates winter nights from summer afternoons. Its July heat outdoes that of 65% of U.S. towns. The outdoor season runs from April to June and September to October, with highs of 66–84°.
A year in Catonsville at a glance
Each month’s typical high and low, and what it brings.
What stands out about Catonsville’s climate
Compared with towns across the U.S., with Catonsville’s place in Maryland beside it.
What a year in Catonsville feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 204 frost-free days a year
In half of years the last 32° night comes by April 10 and the first by October 31. Frost and day counts come from NOAA’s station at Baltimore Wash International Airport, 7 miles from the town’s center, 200 ft lower.
The 2023 USDA map puts Catonsville’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 6°. 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 29 inches of snow a winter
Snow, measured at Columbia 2.3 N, MD, is heaviest from January through February, about 10 inches a month. Precipitation (rain plus melted snow) adds up to 47 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 140 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Catonsville
77% of the work is heating. Months averaging under 55° run from November 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 Baltimore Wash International Airport.
Living with Catonsville’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
204 frost-free days in zone 7b. The last frost comes by Apr 10 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 31.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 54 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Catonsville from natural hazards, river flooding is the largest share (38%); heat waves, cold waves, winter storms and ice storms together are 39%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Catonsville and its neighbors
Baltimore the hottest July afternoons (89°, 2° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Catonsville’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 |
|---|---|---|---|---|
| Catonsville, MD | 25° | 88° | 47" | 29" |
| North Arlington, NJ | 24° | 87° | 47" | 28" |
| Charleston, WV | 25° | 87° | 46" | 32" |
| Fort Thomas, KY | 24° | 87° | 45" | 23" |
| Tappan, NY | 23° | 86° | 48" | 33" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Catonsville averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.0°).
A bigger shift than in 89% 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 Catonsville compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Catonsville’s place among Maryland’s.
Catonsville weather by month
Highs, lows and precipitation from NOAA’s grid at Catonsville’s center; snow, wet days and snow on the ground from Columbia 2.3 N, MD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 42° | 25° | 3.2" | 9.0" | 11 | 25° – 41° |
| February | 46° | 26° | 2.8" | 10.0" | 11 | 25° – 44° |
| March | 54° | 33° | 4.1" | 5.2" | 12 | 38° – 53° |
| April | 66° | 43° | 3.7" | 0.0" | 13 | 51° – 60° |
| May | 75° | 53° | 4.3" | 0.0" | 15 | 60° – 70° |
| June | 84° | 62° | 4.3" | 0.0" | 12 | 69° – 78° |
| July | 88° | 67° | 4.5" | 0.0" | 11 | 72° – 81° |
| August | 85° | 65° | 4.4" | 0.0" | 12 | 71° – 78° |
| September | 79° | 58° | 4.6" | 0.0" | 10 | 65° – 72° |
| October | 68° | 47° | 4.3" | 0.0" | 11 | 54° – 63° |
| November | 56° | 37° | 3.5" | 0.2" | 9 | 40° – 52° |
| December | 47° | 29° | 3.8" | 4.1" | 12 | 29° – 49° |
| Year | 66° | 45° | 47.4" | 28.5" | 140 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 29° to 49°. September is the most reliable, staying within 7°.
Where Catonsville’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 Catonsville’s center.
- Snow: Columbia 2.3 N, MD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Baltimore Wash International Airport, 7 miles from the town’s center, 200 ft lower; 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 Catonsville’s climate
What is the weather like in Catonsville?
A typical July afternoon reaches 88°, a January night drops to 25°, and about 29 inches of snow falls in a normal winter. Milder January nights than 63% of U.S. towns; hotter July afternoons than 65% of U.S. towns.
How cold does it get in Catonsville in winter?
January nights average 25°. About 93 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 25°.
How much snow does Catonsville get?
About 29 inches in a normal winter at Columbia 2.3 N, MD, heaviest from January through February, about 10 inches a month.
How hot does it get in Catonsville?
July, with a typical high of 88° and a low of 67°. About 34 days a year reach 90° and 1 reach 100° (Baltimore Wash International Airport).
When is the first and last frost in Catonsville?
In half of years the last spring frost (32°) comes by April 10 and the first fall frost by October 31, about 204 frost-free days, at Baltimore Wash International Airport.
What growing zone is Catonsville in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 6°.
What is the best time of year to visit Catonsville?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Catonsville getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 89% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Catonsville.
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.