Photo: Acroterion · CC BY-SA 4.0In Rosemont, July heat, January chill and rainfall all sit near the middle of U.S. towns
Expect July afternoons of about 87°. Summer afternoons here are warmer than in 62% of U.S. towns. Compared with 1901–2000, the average now sits 1.5° higher. From April to June and September to October, highs of 66–83° make it easy to spend the day outdoors.
A year in Rosemont at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rosemont’s climate
Compared with towns across the U.S., with Rosemont’s place in Maryland beside it.
What a year in Rosemont feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 175 frost-free days a year
In half of years the last 32° night comes by April 26 and the first by October 18. Frost and day counts come from NOAA’s station at Sharpsburg 5 S, MD, 7 miles from the town’s center, at about the same height.
The 2023 USDA map puts Rosemont’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. 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 31 inches of snow a winter
Snow, measured at Damascus 3 Ssw, MD, falls mostly in February. Precipitation (rain plus melted snow) adds up to 42 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 119 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Rosemont
86% of the work is heating, so the furnace matters far more than the air conditioner. 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 Sharpsburg 5 S, MD.
Living with Rosemont’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
175 frost-free days in zone 7a. The last frost comes by Apr 26 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 18.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 0.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Rosemont from natural hazards, river flooding is the largest share (64%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Rosemont and similar climates
TownRatings has no climate map of the towns around Rosemont yet.
Climates most like Rosemont’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 |
|---|---|---|---|---|
| Rosemont, MD | 24° | 87° | 42" | 31" |
| South Charleston, WV | 25° | 87° | 46" | 32" |
| Fort Thomas, KY | 24° | 87° | 45" | 23" |
| Groveport, OH | 22° | 86° | 41" | 28" |
| Florence, NJ | 25° | 87° | 47" | 27" |
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 Rosemont averaged 1.5° warmer than the 1900s. The biggest change is in December (+2.8°).
A bigger shift than in 58% 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 Rosemont compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rosemont’s place among Maryland’s.
Rosemont weather by month
Highs, lows and precipitation from NOAA’s grid at Rosemont’s center; snow, wet days and snow on the ground from Damascus 3 Ssw, MD. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 41° | 24° | 2.9" | 9.4" | 10 | 8 | 24° – 41° |
| February | 45° | 26° | 2.5" | 11.1" | 10 | 9 | 25° – 43° |
| March | 53° | 33° | 3.7" | 4.8" | 10 | 3 | 38° – 52° |
| April | 66° | 42° | 3.5" | 0.2" | 11 | 0 | 50° – 59° |
| May | 74° | 51° | 4.4" | 0.0" | 11 | 0 | 58° – 69° |
| June | 83° | 60° | 3.9" | 0.0" | 11 | 0 | 68° – 74° |
| July | 87° | 65° | 4.1" | 0.0" | 10 | 0 | 71° – 79° |
| August | 85° | 63° | 3.2" | 0.0" | 10 | 0 | 70° – 77° |
| September | 78° | 56° | 4.3" | 0.0" | 9 | 0 | 64° – 71° |
| October | 67° | 45° | 3.4" | 0.0" | 9 | 0 | 52° – 63° |
| November | 55° | 35° | 3.1" | 0.8" | 8 | 1 | 39° – 50° |
| December | 45° | 28° | 3.5" | 5.1" | 10 | 5 | 27° – 46° |
| Year | 65° | 44° | 42.4" | 31.4" | 119 | 26 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 27° to 46°. September is the most reliable, staying within 7°.
Where Rosemont’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 Rosemont’s center.
- Snow: Damascus 3 Ssw, MD.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sharpsburg 5 S, MD, 7 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 Rosemont’s climate
What is the weather like in Rosemont?
A typical July afternoon reaches 87°, a January night drops to 24°, and about 31 inches of snow falls in a normal winter. Milder January nights than 60% of U.S. towns; hotter July afternoons than 62% of U.S. towns.
How cold does it get in Rosemont in winter?
January nights average 24°. About 126 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 24°.
How much snow does Rosemont get?
About 31 inches in a normal winter at Damascus 3 Ssw, MD, most of it in February, with snow on the ground about 26 days a year.
How hot does it get in Rosemont?
July, with a typical high of 87° and a low of 65°. About 25 days a year reach 90° (Sharpsburg 5 S, MD).
When is the first and last frost in Rosemont?
In half of years the last spring frost (32°) comes by April 26 and the first fall frost by October 18, about 175 frost-free days, at Sharpsburg 5 S, MD.
What growing zone is Rosemont in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Rosemont?
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 Rosemont getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 58% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rosemont.
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.