Maryland Science Center Baltimore, Maryland climate: Climate normals at a NOAA weather station
Maryland Science Center Baltimore's normal year runs from 30°F January nights to 90°F July afternoons, with 43.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.1°C, January lows of −1°C, July highs of 32°C, 1,111 mm of precipitation a year.
- NOAA stationMaryland Science Center Baltimore
- Station IDUSW00093784
- Location39.28°N 76.61°W
- Elevation20 ft (6 m)
On October 23, the normal high in Maryland Science Center Baltimore is 66°F and the normal low 50°F, and the chance of measurable rain or snow is 27%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Maryland Science Center Baltimore.
- Jan 44° 30°
- Feb 47° 32°
- Mar 55° 39°
- Apr 67° 48°
- May 76° 58°
- Jun 85° 68°
- Jul 90° 73°
- Aug 87° 71°
- Sep 80° 65°
- Oct 69° 53°
- Nov 58° 43°
- Dec 48° 35°
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 Maryland Science Center Baltimore each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 30°F. The most precipitation falls in July (4.71 in), the least in February (2.75 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 44°F | 30°F | 36.9°F | 3.07 | 10 | <1 | 18 | 9 h 40 min |
| February | 47°F | 32°F | 39.4°F | 2.75 | 10 | <1 | 14 | 10 h 40 min |
| March | 55°F | 39°F | 46.9°F | 3.93 | 11 | <1 | 6 | 11 h 50 min |
| April | 67°F | 48°F | 57.5°F | 3.55 | 11 | 1 | <1 | 13 h 10 min |
| May | 76°F | 58°F | 67.0°F | 3.39 | 11 | 3 | <1 | 14 h 20 min |
| June | 85°F | 68°F | 76.6°F | 3.36 | 11 | 9 | <1 | 14 h 50 min |
| July | 90°F | 73°F | 81.5°F | 4.71 | 11 | 16 | <1 | 14 h 40 min |
| August | 87°F | 71°F | 79.1°F | 4.35 | 10 | 11 | <1 | 13 h 50 min |
| September | 80°F | 65°F | 72.5°F | 4.49 | 9 | 4 | <1 | 12 h 30 min |
| October | 69°F | 53°F | 60.7°F | 3.49 | 9 | <1 | <1 | 11 h 10 min |
| November | 58°F | 43°F | 50.1°F | 2.98 | 8 | <1 | 2 | 10 h |
| December | 48°F | 35°F | 41.3°F | 3.66 | 10 | <1 | 12 | 9 h 30 min |
| Year (annual) | 67°F | 51°F | 59.1°F | 43.73 | 119 | 43 | 52 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 7°C | −1°C | 2.7°C | 78 mm |
| February | 8°C | 0°C | 4.1°C | 70 mm |
| March | 13°C | 4°C | 8.3°C | 100 mm |
| April | 19°C | 9°C | 14.2°C | 90 mm |
| May | 24°C | 14°C | 19.4°C | 86 mm |
| June | 30°C | 20°C | 24.8°C | 85 mm |
| July | 32°C | 23°C | 27.5°C | 120 mm |
| August | 31°C | 22°C | 26.2°C | 110 mm |
| September | 27°C | 18°C | 22.5°C | 114 mm |
| October | 20°C | 11°C | 15.9°C | 89 mm |
| November | 14°C | 6°C | 10.1°C | 76 mm |
| December | 9°C | 1°C | 5.2°C | 93 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Baltimore (9 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 USW00093784; 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 Maryland Science Center Baltimore?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, September has the fewest days with rain (9).
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 USW00093784.
When is the last frost at Maryland Science Center Baltimore?
In Maryland Science Center Baltimore, the last spring frost (32°F) comes after March 24 in half of years and after April 4 in one year in ten; the first autumn frost comes before November 21 in half of years and before November 7 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
- March 241 year in 10 after April 4; 9 in 10 after March 8
- First autumn frost, half of years before
- November 211 year in 10 before November 7; 9 in 10 before December 8
NOAA puts the median frost-free season at 244 days, and the season without a hard freeze (28°F) at 270 days.
A hard freeze (28°F) comes after March 11 in half of springs and before December 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Maryland Science Center Baltimore in zone 8a in ZIP code 21233, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 8a: the coldest night of a typical year reaches 13°F (19 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 USW00093784; 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 at Maryland Science Center Baltimore?
In a normal year in Maryland Science Center Baltimore, 43 days a year reach 90°F (2 of them 100°F or more), 52 nights fall to 32°F or colder and 119 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 52a normal year
- Days that stay below freezing
- 9high of 32°F or less
- Days with 0.01 inch of precipitation
- 119a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00093784.
How sunny is it at Maryland Science Center Baltimore?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds at Maryland Science Center Baltimore, 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 Maryland Science Center Baltimore record?
A normal year at Maryland Science Center Baltimore brings 3,858 heating degree days, 28% fewer than the median U.S. place (5,373), and 1,749 cooling degree days, 93% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,686 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 873 | 0 |
| February | 718 | 0 |
| March | 562 | 3 |
| April | 254 | 29 |
| May | 70 | 130 |
| June | 4 | 351 |
| July | 0 | 511 |
| August | 0 | 439 |
| September | 15 | 238 |
| October | 179 | 46 |
| November | 448 | 1 |
| December | 735 | 0 |
| Year (annual) | 3,858 | 1,749 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093784. 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 Maryland Science Center Baltimore been warmer than normal?
2025 averaged 60.3°F, 1.2°F above the 1991-2020 normal of 59.1°F.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2025 | 60.3°F | +1.2°F | 34.77 |
Over 134 complete years from 1871 to 2025, the station's annual mean temperature rose at a fitted 2.6°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00093784; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Maryland Science Center Baltimore's climate compare?
Maryland Science Center Baltimore is warmer than 25 of the 26 places with their own NOAA record in Maryland, and wetter than 6. Across the 7,247 U.S. stations with normals, its annual mean of 59.1°F is warmer than 72%.
In the Köppen classification computed from these normals, Maryland Science Center Baltimore 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 Maryland Science Center Baltimore share this climate record?
13 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.
- Dundalk, MDalso near: Cylburn (10 mi, 56.1°F a year); Baltimore (12 mi, 56.2°F a year)65,441 people · 6 mi E
- Catonsville, MD42,717 people · 7 mi W
- Essex, MD40,670 people · 9 mi E
- Middle River, MD31,616 people · 10 mi NE
- Arbutus, MD20,869 people · 5 mi SW
- Rosedale, MD20,845 people · 6 mi NE
- Brooklyn Park, MD15,799 people · 4 mi S
- Rossville, MD15,088 people · 9 mi NE
- White Marsh, MD10,480 people · 11 mi NE
- Lansdowne, MD8,879 people · 4 mi SW
- Edgemere, MD8,778 people · 9 mi SE
- Baltimore Highlands, MD8,564 people · 3 mi SW
- Bowleys Quarters, MD6,795 people · 12 mi E
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 Maryland Science Center Baltimore's climate
What is the coldest month at Maryland Science Center Baltimore?
January, with a normal high of 44°F and a normal low of 30°F. The warmest is July (90°F by day, 73°F at night).
Does it snow at Maryland Science Center Baltimore?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Baltimore (9 miles away), records 19 inches of snow in a normal year.
What is the rainiest month at Maryland Science Center Baltimore?
July, with 4.71 in of precipitation in a normal year; the driest is February with 2.75 in.
What plant hardiness zone is Maryland Science Center Baltimore in?
The USDA's 2023 map puts Maryland Science Center Baltimore in zone 8a in ZIP code 21233, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 13°F (19 years, 1991-2020): zone 8a.
How late can frost come at Maryland Science Center Baltimore?
In half of years the last 32°F night comes after March 24; in one year in ten it comes after April 4. Waiting until April 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maryland climateThe statewide normals and every place in the state
- Cylburn, MD6 miles from this station, 56.1°F a year
- Baltimore, MD9 miles from this station, 56.2°F a year
- Annapolis Police Barracks, MD21 miles from this station, 58.8°F a year
- Laurel, MD21 miles from this station, 57.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made