Hillsboro has chilly winters and warm summers
A typical July afternoon reaches 89°, a January night drops to 26°, and about 14 inches of snow falls in a normal winter.
A year in Hillsboro at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hillsboro’s climate
Read from where Hillsboro sits among Maryland’s towns. The page puts what stands out first.
About 220 frost-free days a year
In half of years the last 32° night comes by April 1 and the first by November 7.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Hillsboro’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
220 frost-free days. The last frost comes by Apr 1 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 7.
About 14" a winter over 4 days with an inch or more, most in January.
Months averaging under 55° run from November through March. Heating is 73% of the year’s heating-and-cooling load.
About 32 days a year reach 90°, and July afternoons average 89°.
The nicest months are April, May, September and October. 0.3 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →What a year in Hillsboro feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
14 inches of snow, 45 of rain and melt
August is the wettest month and February the driest. Rain or snow falls on about 118 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Warmer than it used to be
The last 30 years in Hillsboro averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.0°).
A bigger shift than in 84% of U.S. towns.
Change by month
How Hillsboro compares
Against every U.S. town on TownTapestry, each counted once, with its place in Maryland.
Hillsboro 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 | 44° | 26° | 3.2" | 5.1" | 10 | 4 | 27° – 42° |
| February | 47° | 27° | 2.8" | 4.8" | 10 | 4 | 26° – 45° |
| March | 55° | 34° | 4.1" | 2.3" | 11 | 1 | 39° – 53° |
| April | 67° | 43° | 3.5" | 0.1" | 11 | 0 | 52° – 60° |
| May | 76° | 53° | 3.8" | 0 | 11 | 0 | 60° – 71° |
| June | 84° | 62° | 4.1" | 0 | 10 | 0 | 69° – 78° |
| July | 89° | 67° | 4.2" | 0 | 10 | 0 | 73° – 81° |
| August | 87° | 65° | 4.5" | 0 | 9 | 0 | 72° – 79° |
| September | 80° | 58° | 4.2" | 0 | 8 | 0 | 66° – 74° |
| October | 69° | 47° | 3.8" | 0 | 9 | 0 | 54° – 64° |
| November | 58° | 37° | 3.2" | 0 | 9 | 0 | 41° – 52° |
| December | 49° | 30° | 3.8" | 1.8" | 11 | 1 | 31° – 50° |
| Year | 67° | 46° | 45.1" | 14.1" | 118 | 9 |
Heating and cooling a home in Hillsboro
73% of the work is heating.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 31° to 50°. August is the most reliable, staying within 7°.
Common questions about Hillsboro’s climate
What is the coldest month in Hillsboro?
January, with a typical high of 44° and a low of 26°.
What is the hottest month in Hillsboro?
July, with a typical high of 89° and a low of 67°. About 32 days a year reach 90°.
How much snow does Hillsboro get?
About 14 inches in a normal winter, most of it in January.
When is the first frost in Hillsboro?
In half of years the first 32° night comes by November 7, and the last spring frost by April 1.
What is the rainiest month in Hillsboro?
August, with 4.5 inches of rain and melted snow. The year totals 45 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hillsboro.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Hillsboro itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Royal Oak 2 Ssw, MD (19 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.