Chestertown, Maryland climate: Normal weather by month, frost dates and records
Chestertown's normal year runs from 27°F January nights to 87°F July afternoons, with 46.0 inches of precipitation and 17 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.3°C, January lows of −3°C, July highs of 30°C, 1,167 mm of precipitation a year.
- NOAA stationChestertown
- Station IDUSC00181750
- Location39.22°N 76.05°W
- Elevation40 ft (12 m)
- From the center1 miles
- Population5,702
On October 23, the normal high in Chestertown is 64°F and the normal low 45°F, and the chance of measurable rain or snow is 26%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Chestertown.
- Jan 41° 27°
- Feb 44° 28°
- Mar 53° 35°
- Apr 64° 45°
- May 74° 55°
- Jun 82° 64°
- Jul 87° 69°
- Aug 85° 67°
- Sep 78° 60°
- Oct 67° 48°
- Nov 56° 38°
- Dec 45° 31°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Chestertown each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 27°F. The most precipitation falls in September (4.90 in), the least in February (2.89 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 41°F | 27°F | 34.0°F | 3.34 | 5.2 | 10 | <1 | 25 | 9 h 40 min |
| February | 44°F | 28°F | 36.2°F | 2.89 | 7.9 | 8 | <1 | 22 | 10 h 40 min |
| March | 53°F | 35°F | 43.8°F | 4.25 | 1.7 | 10 | <1 | 15 | 11 h 50 min |
| April | 64°F | 45°F | 54.7°F | 3.72 | 0.2 | 10 | <1 | 2 | 13 h 10 min |
| May | 74°F | 55°F | 64.2°F | 3.88 | 0.0 | 10 | 2 | <1 | 14 h 20 min |
| June | 82°F | 64°F | 73.1°F | 4.41 | 0.0 | 9 | 8 | <1 | 14 h 50 min |
| July | 87°F | 69°F | 77.7°F | 4.35 | 0.0 | 9 | 13 | <1 | 14 h 40 min |
| August | 85°F | 67°F | 76.1°F | 3.56 | 0.0 | 8 | 11 | <1 | 13 h 50 min |
| September | 78°F | 60°F | 69.2°F | 4.90 | 0.0 | 8 | 3 | <1 | 12 h 30 min |
| October | 67°F | 48°F | 57.4°F | 3.67 | 0.0 | 8 | <1 | 1 | 11 h 10 min |
| November | 56°F | 38°F | 46.8°F | 3.18 | 0.0 | 9 | <1 | 10 | 10 h |
| December | 45°F | 31°F | 38.3°F | 3.81 | 1.7 | 10 | <1 | 23 | 9 h 30 min |
| Year (annual) | 65°F | 47°F | 56.0°F | 45.96 | 16.7 | 108 | 37 | 97 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −3°C | 1.1°C | 85 mm | 13 cm |
| February | 7°C | −2°C | 2.3°C | 73 mm | 20 cm |
| March | 11°C | 2°C | 6.6°C | 108 mm | 4 cm |
| April | 18°C | 7°C | 12.6°C | 94 mm | 1 cm |
| May | 23°C | 13°C | 17.9°C | 99 mm | 0 cm |
| June | 28°C | 18°C | 22.8°C | 112 mm | 0 cm |
| July | 30°C | 20°C | 25.4°C | 110 mm | 0 cm |
| August | 29°C | 20°C | 24.5°C | 90 mm | 0 cm |
| September | 26°C | 16°C | 20.7°C | 124 mm | 0 cm |
| October | 19°C | 9°C | 14.1°C | 93 mm | 0 cm |
| November | 13°C | 3°C | 8.2°C | 81 mm | 0 cm |
| December | 7°C | 0°C | 3.5°C | 97 mm | 4 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00181750; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Chestertown?
Normal highs sit between 65°F and 85°F in May, June, August, September and October. Of those, August has the fewest days with rain (8).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00181750.
When is the last frost in Chestertown?
In Chestertown, the last spring frost (32°F) comes after April 3 in half of years and after April 16 in one year in ten; the first autumn frost comes before November 5 in half of years and before October 24 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 31 year in 10 after April 16; 9 in 10 after March 20
- First autumn frost, half of years before
- November 51 year in 10 before October 24; 9 in 10 before November 20
NOAA puts the median frost-free season at 217 days, and the season without a hard freeze (28°F) at 240 days.
A hard freeze (28°F) comes after March 21 in half of springs and before November 17 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Chestertown in zone 7b in ZIP code 21620, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Chestertown's NOAA station is in zone 7b: the coldest night of a typical year reaches 7°F (20 complete years).
Frost dates for every NOAA station in Maryland · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00181750; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Chestertown?
In a normal year in Chestertown, 37 days a year reach 90°F (1 of them 100°F or more), 97 nights fall to 32°F or colder and 108 days bring measurable precipitation.
- Days at 90°F or more
- 37a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 97a normal year
- Days that stay below freezing
- 11high of 32°F or less
- Days with 0.01 inch of precipitation
- 108a normal year
- Days with 1 inch of snow or more
- 5a normal year
The highest temperature in this station's record (since 1893) is 104°F, on July 4, 2002; the lowest is −9°F, on February 11, 1899.
The wettest calendar year on that record is 2003, with 63.42 in; the snowiest season is 1995–96, with 49.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00181750; records: ACIS (NOAA Regional Climate Centers), station USC00181750. Records use complete months only; a month missing more than three days is left out.
How sunny is Chestertown?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Chestertown, 4.0 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 2.0 |
| February | 69% | 2.9 |
| March | 68% | 3.8 |
| April | 72% | 5.0 |
| May | 72% | 5.5 |
| June | 78% | 6.2 |
| July | 82% | 6.2 |
| August | 80% | 5.4 |
| September | 76% | 4.3 |
| October | 72% | 3.2 |
| November | 73% | 2.3 |
| December | 67% | 1.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Chestertown need?
A normal year in Chestertown brings 4,546 heating degree days, 15% fewer than the median U.S. place (5,373), and 1,284 cooling degree days, 41% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,938 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 962 | 0 |
| February | 808 | 0 |
| March | 658 | 1 |
| April | 327 | 18 |
| May | 109 | 86 |
| June | 13 | 256 |
| July | 0 | 392 |
| August | 1 | 345 |
| September | 35 | 162 |
| October | 258 | 24 |
| November | 547 | 1 |
| December | 829 | 0 |
| Year (annual) | 4,546 | 1,284 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00181750. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Chestertown's climate compare?
Chestertown is warmer than 12 of the other 25 places with their own NOAA record in Maryland, and wetter than 11. Across the 7,247 U.S. stations with normals, its annual mean of 56.0°F is warmer than 64%.
In the Köppen classification computed from these normals, Chestertown is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Chestertown share this climate record?
18 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Middletown, DE25,686 people · 24 mi NE
- Centreville, MD4,771 people · 12 mi S
- Townsend, DE2,941 people · 23 mi NE
- Kingstown, MD1,836 people · 1 mi SE
- Rock Hall, MD1,200 people · 11 mi SW
- Church Hill, MD831 people · 6 mi SE
- Galena, MD538 people · 13 mi NE
- Butlertown, MD522 people · 5 mi NW
- Chesapeake Landing, MD465 people · 7 mi NW
- Tolchester, MD381 people · 10 mi W
- Crumpton, MD299 people · 7 mi E
- Fairlee, MD259 people · 6 mi W
- Kennedyville, MD203 people · 7 mi NE
- Still Pond, MD138 people · 8 mi N
- Worton, MD137 people · 4 mi NW
- Hartly, DE78 people · 19 mi E
- Georgetown, MD43 people · 8 mi W
- Edesville, MD39 people · 9 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Chestertown's climate
What is the coldest month in Chestertown?
January, with a normal high of 41°F and a normal low of 27°F. The warmest is July (87°F by day, 69°F at night).
Does it snow in Chestertown?
Yes: 17 inches in a normal year, falling on 7 days with 0.1 inch or more, the most in February (7.9 inches).
What is the rainiest month in Chestertown?
September, with 4.90 in of precipitation in a normal year; the driest is February with 2.89 in.
What plant hardiness zone is Chestertown in?
The USDA's 2023 map puts Chestertown in zone 7b in ZIP code 21620, the nearest ZIP area. By the same method at Chestertown's NOAA station, the coldest night of a typical year reaches 7°F (20 years, 1991-2020): zone 7b.
How late can frost come in Chestertown?
In half of years the last 32°F night comes after April 3; in one year in ten it comes after April 16. Waiting until April 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maryland climateThe statewide normals and every place in the state
- Aberdeen, MD19 miles from this station, 55.2°F a year
- Stevensville, MD23 miles from this station, 57.1°F a year
- Annapolis, MD27 miles from this station, 57.7°F a year
- Annapolis Police Barracks, MD29 miles from this station, 58.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made