Cylburn, Maryland climate: Climate normals at a NOAA weather station
Cylburn's normal year runs from 27°F January nights to 87°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.4°C, January lows of −3°C, July highs of 30°C.
- NOAA stationCylburn
- Station IDUSC00182308
- Location39.35°N 76.65°W
- Elevation235 ft (72 m)
On October 23, the normal high in Cylburn is 64°F and the normal low 46°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Cylburn.
- Jan 42° 27°
- Feb 46° 28°
- Mar 54° 34°
- Apr 66° 45°
- May 73° 55°
- Jun 82° 64°
- Jul 87° 69°
- Aug 84° 67°
- Sep 77° 60°
- Oct 66° 49°
- Nov 56° 39°
- Dec 46° 32°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Cylburn each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 27°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 42°F | 27°F | 34.5°F | – | <1 | 24 | 9 h 40 min |
| February | 46°F | 28°F | 37.3°F | – | <1 | 22 | 10 h 40 min |
| March | 54°F | 34°F | 44.0°F | – | <1 | 15 | 11 h 50 min |
| April | 66°F | 45°F | 55.2°F | – | <1 | 2 | 13 h 10 min |
| May | 73°F | 55°F | 63.9°F | – | 1 | <1 | 14 h 20 min |
| June | 82°F | 64°F | 72.9°F | – | 4 | <1 | 15 h |
| July | 87°F | 69°F | 77.9°F | – | 7 | <1 | 14 h 40 min |
| August | 84°F | 67°F | 75.4°F | – | 5 | <1 | 13 h 50 min |
| September | 77°F | 60°F | 68.3°F | – | 2 | <1 | 12 h 30 min |
| October | 66°F | 49°F | 57.4°F | – | <1 | 1 | 11 h 10 min |
| November | 56°F | 39°F | 47.5°F | – | <1 | 9 | 10 h |
| December | 46°F | 32°F | 38.9°F | – | <1 | 20 | 9 h 30 min |
| Year (annual) | 65°F | 47°F | 56.1°F | – | 18 | 92 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 6°C | −3°C | 1.4°C |
| February | 8°C | −2°C | 2.9°C |
| March | 12°C | 1°C | 6.7°C |
| April | 19°C | 7°C | 12.9°C |
| May | 23°C | 13°C | 17.7°C |
| June | 28°C | 18°C | 22.7°C |
| July | 30°C | 21°C | 25.5°C |
| August | 29°C | 19°C | 24.1°C |
| September | 25°C | 15°C | 20.2°C |
| October | 19°C | 9°C | 14.1°C |
| November | 14°C | 4°C | 8.6°C |
| December | 8°C | 0°C | 3.8°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Baltimore (13 miles away), gets 19 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00182308; 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.
Which months are mildest at Cylburn?
Normal highs sit between 65°F and 85°F in April, May, June, August, September and October.
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 USC00182308.
When is the last frost at Cylburn?
In Cylburn, the last spring frost (32°F) comes after April 2 in half of years and after April 13 in one year in ten; the first autumn frost comes before November 7 in half of years and before October 27 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 21 year in 10 after April 13; 9 in 10 after March 20
- First autumn frost, half of years before
- November 71 year in 10 before October 27; 9 in 10 before November 21
NOAA puts the median frost-free season at 220 days, and the season without a hard freeze (28°F) at 243 days.
A hard freeze (28°F) comes after March 22 in half of springs and before November 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Cylburn in zone 7b in ZIP code 21210, the nearest ZIP area.
Frost dates for every NOAA station in Maryland · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00182308; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 at Cylburn?
In a normal year in Cylburn, 18 days a year reach 90°F and 92 nights fall to 32°F or colder.
- Days at 90°F or more
- 18a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 92a normal year
- Days that stay below freezing
- 13high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00182308.
How sunny is it at Cylburn?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds at Cylburn, 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 many heating and cooling degree days does Cylburn record?
A normal year at Cylburn brings 4,443 heating degree days, 17% fewer than the median U.S. place (5,373), and 1,236 cooling degree days, 36% 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 3,925 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 945 | 0 |
| February | 776 | 0 |
| March | 652 | 1 |
| April | 314 | 20 |
| May | 111 | 75 |
| June | 13 | 251 |
| July | 1 | 400 |
| August | 2 | 325 |
| September | 43 | 142 |
| October | 257 | 21 |
| November | 524 | 1 |
| December | 807 | 0 |
| Year (annual) | 4,443 | 1,236 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00182308. 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.
Have recent years at Cylburn been warmer than normal?
2025 averaged 56.0°F, 0.1°F below the 1991-2020 normal of 56.1°F. 1 of the 2 complete years since 2024 ran warmer than the normal.
| Year | Mean | Against normal |
|---|---|---|
| 2024 | 57.9°F | +1.8°F |
| 2025 | 56.0°F | −0.1°F |
Source: observed years: ACIS, station USC00182308. A year counts only with all twelve months complete.
How does Cylburn's climate compare?
Cylburn is warmer than 15 of the 26 places with their own NOAA record in Maryland. Across the 7,247 U.S. stations with normals, its annual mean of 56.1°F is warmer than 64%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Cylburn share this climate record?
22 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.
- Ellicott City, MDalso near: Baltimore (11 mi, 56.2°F a year); Maryland Science Center Baltimore (12 mi, 59.1°F a year)73,737 people · 11 mi SW
- Towson, MDalso near: Maryland Science Center Baltimore (8 mi, 59.1°F a year); Baltimore (16 mi, 56.2°F a year)57,683 people · 3 mi NE
- Woodlawn, MD40,476 people · 6 mi SW
- Randallstown, MD35,975 people · 8 mi W
- Owings Mills, MD35,626 people · 8 mi NW
- Pikesville, MD34,253 people · 4 mi NW
- Milford Mill, MD31,939 people · 6 mi W
- Eldersburg, MD30,626 people · 16 mi W
- Parkville, MD30,423 people · 6 mi E
- Perry Hall, MD28,908 people · 10 mi E
- Carney, MD28,624 people · 8 mi NE
- Reisterstown, MD27,764 people · 11 mi NW
- Lochearn, MD27,591 people · 4 mi W
- Cockeysville, MD23,265 people · 9 mi N
- Mays Chapel, MD15,616 people · 6 mi N
- Overlea, MD12,430 people · 7 mi E
- Honeygo, MD12,022 people · 12 mi E
- Timonium, MD10,880 people · 7 mi NE
- Garrison, MD10,449 people · 6 mi NW
- Lutherville, MD6,670 people · 5 mi N
- Hampton, MD5,138 people · 7 mi NE
- Kingsville, MD4,790 people · 14 mi NE
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 Cylburn's climate
What is the coldest month at Cylburn?
January, with a normal high of 42°F and a normal low of 27°F. The warmest is July (87°F by day, 69°F at night).
Does it snow at Cylburn?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Baltimore (13 miles away), records 19 inches of snow in a normal year.
What plant hardiness zone is Cylburn in?
The USDA's 2023 map puts Cylburn in zone 7b in ZIP code 21210, the nearest ZIP area.
How late can frost come at Cylburn?
In half of years the last 32°F night comes after April 2; in one year in ten it comes after April 13. Waiting until April 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maryland climateThe statewide normals and every place in the state
- Maryland Science Center Baltimore, MD6 miles from this station, 59.1°F a year
- Baltimore, MD13 miles from this station, 56.2°F a year
- Laurel, MD23 miles from this station, 57.1°F a year
- Annapolis Police Barracks, MD26 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