Frost Advisory
Ends in 48 min
When
Until 9 AM EDT this morning.
Where
Carroll, Frederick, Cecil, Northern Baltimore, and Harford Counties in Maryland.
Issued for this forecast zone · National Weather Service Baltimore MD/Washington DC
What, impacts and precautionsHide details
What
Temperatures as low as 33 will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Frederick; Carroll; Northern Baltimore; Cecil; Northwest Harford; Southeast Harford
See it on weather.gov (opens in a new tab)

Observed 7:50 AM EDT at KTHV

Pylesville, MD weather

Foggy and 30°−1°.

Forecasts agree

Now 30°−1°

Fog

Wind: Calm; Light through 8 PM
Dew point: 30°−1°; Dry · up to 39°4° by 10 AM (comfortable)
Humidity: 100%; Air 30°−1°, dew point 30°−1° · frost likely
UV index: 0Low; Moderate 12–3 PM · peak 4
Air quality: 53Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.53 inHg1034 hPa; Rising slowly · +0.03 inHg+1.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 50°10° today by 11 AM
High 62°17° today at 2 PM
Drops 13°7° today 5–8 PM (61°16° → 48°9°)
Below 50°10° tonight after 7 PM
Drops 12°7° tomorrow 5–8 PM (64°18° → 52°11°)

This morningUp to 55°13° by 11 AM · Clear
This afternoonUp to 62°17° by 2 PM · Clear
TonightDown to 34°1° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 3 PM · Clear
Tomorrow nightDown to 39°4° by 5 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 8a	Mostly sunny	35°2° (likely 35°2° to 39°4°)	35°2°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	100%	21%	0
Sat 9a	Sunny	42°6° (likely 42°6° to 44°7°)	42°6°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	86%	19%	0
Sat 10a	Sunny	48°9° (likely 48°9° to 51°11°)	48°9°	0%	1 mph2 km/h from NE, gusts 5 mph7 km/h	71%	3%	1
Sat 11a	Sunny	55°13° (likely 53°12° to 56°13°)	55°13°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	55%	1%	2
Sat 12p	Sunny	57°14° (likely 56°13° to 59°15°)	57°14°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	51%	0%	3
Sat 1p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	44%	0%	4
Sat 2p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	2 mph3 km/h from SE, gusts 4 mph7 km/h	41%	0%	3
Sat 3p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	41%	0%	2
Sat 4p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	41%	1%	1
Sat 5p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	44%	0%	1
Sat 6p	Clear	56°13° (likely 54°12° to 56°13°)	56°13°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	53%	0%	0
Sat 7p	Clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	71%	0%	0
Sat 8p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	79%	0%	0
Sat 9p	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	82%	0%	0
Sat 10p	Clear	40°4° (likely 40°4° to 48°9°)	40°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	92%	0%	0
Sat 11p	Clear	39°4° (likely 39°4° to 47°8°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	0%	0
Sun 12a	Clear	39°4° (likely 39°4° to 47°8°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	0%	0
Sun 1a	Clear	38°3° (likely 38°3° to 46°8°)	38°3°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0
Sun 2a	Clear	37°3° (likely 37°3° to 46°8°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 3a	Clear	37°3° (likely 37°3° to 45°7°)	37°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	0%	0
Sun 4a	Clear	35°2° (likely 35°2° to 44°7°)	35°2°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0
Sun 5a	Clear	34°1° (likely 34°1° to 43°6°)	34°1°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	100%	0%	0
Sun 6a	Clear	34°1° (likely 34°1° to 42°6°)	34°1°	0%	1 mph2 km/h from N, gusts 4 mph7 km/h	100%	0%	0
Sun 7a	Sunny	34°1° (likely 34°1° to 40°4°)	34°1°	0%	1 mph2 km/h from N, gusts 5 mph7 km/h	100%	0%	0
Sun 8a	Sunny	34°1° (likely 34°1° to 41°5°)	34°1°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	100%	7%	0
Sun 9a	Sunny	43°6° (likely 41°5° to 46°8°)	43°6°	0%	1 mph2 km/h from N, gusts 4 mph7 km/h	86%	1%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 53°12°)	50°10°	0%	1 mph2 km/h from N, gusts 4 mph6 km/h	71%	3%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	0 mph0 km/h, gusts 4 mph6 km/h	57%	2%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	1 mph2 km/h from NW, gusts 4 mph7 km/h	51%	3%	4
Sun 1p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	44%	4%	4
Sun 2p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	43%	5%	4
Sun 3p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	41%	8%	4
Sun 4p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 5 mph8 km/h	43%	5%	3
Sun 5p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	0 mph0 km/h, gusts 5 mph8 km/h	46%	3%	1
Sun 6p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	55%	1%	0
Sun 7p	Clear	52°11° (likely 52°11° to 55°13°)	52°11°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	71%	0%	0
Sun 8p	Clear	49°9° (likely 49°9° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	80%	0%	0
Sun 9p	Clear	45°7° (likely 45°7° to 50°10°)	45°7°	0%	0 mph0 km/h, gusts 3 mph5 km/h	93%	0%	0
Sun 10p	Clear	43°6° (likely 43°6° to 49°9°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	96%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	100%	0%	0
Mon 1a	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	100%	0%	0
Mon 2a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	100%	0%	0
Mon 3a	Clear	40°4° (likely 39°4° to 46°8°)	40°4°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	0%	0
Mon 4a	Clear	40°4° (likely 37°3° to 47°8°)	40°4°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	0%	0
Mon 5a	Mostly clear	39°4° (likely 36°2° to 47°8°)	39°4°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	8%	0
Mon 6a	Clear	38°3° (likely 36°2° to 46°8°)	38°3°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	15%	0
Mon 7a	Sunny	37°3° (likely 36°2° to 45°7°)	37°3°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	18%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Sunny. High 62°17°, low 34°1°. Typical 64°18° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Official NWS forecast
Today: Areas of frost before 9am. Sunny, with a high near 62. East wind around 2 mph.
Tonight: Patchy fog between 11pm and 2am, then patchy frost and patchy fog. Clear, with a low around 34. East wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–62°17°
Low, likely
34°1°–38°3°
Typical high / low
64°18° / 44°7°
Wind
6 mph9 km/h, gusts 12 mph19 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 65°18°, low 37°3°. Typical 63°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Official NWS forecast
Day: Patchy frost and patchy fog before 9am. Sunny, with a high near 65. West wind around 1 mph.
Night: Clear, with a low around 37. Southwest wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–65°18°
Low, likely
35°2°–40°4°
Typical high / low
63°17° / 44°7°
Wind
6 mph10 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 69°21°, low 48°9°. Typical 63°17° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy frost between 7am and 8am. Sunny, with a high near 69. Northwest wind 2 to 6 mph.
Night: Mostly clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–69°21°
Low, likely
36°2°–48°9°
Typical high / low
63°17° / 43°6°
Wind
10 mph16 km/h, gusts 19 mph30 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 64°18°, low 42°6°. Typical 62°17° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 64.
Night: Mostly clear, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
42°6°–50°10°
Typical high / low
62°17° / 43°6°
Wind
12 mph19 km/h, gusts 21 mph33 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 62°17°, low 45°7°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62.
Night: Mostly cloudy, with a low around 45.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–62°17°
Low, likely
40°4°–45°7°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h, gusts 17 mph27 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 68°20°, low 49°9°. Typical 62°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 68.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–68°20°
Low, likely
43°6°–49°9°
Typical high / low
62°17° / 42°6°
Wind
8 mph13 km/h, gusts 27 mph43 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 71°22°, low 48°9°. Typical 61°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 72°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 71.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–74°23°
Low, likely
44°7°–51°11°
Typical high / low
61°16° / 42°6°
Wind
14 mph22 km/h, gusts 28 mph45 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 69°21°, low 48°9°. Typical 61°16° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 69°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 49°10°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–75°24°
Low, likely
43°6°–54°12°
Typical high / low
61°16° / 41°5°
Wind
14 mph23 km/h, gusts 28 mph44 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 66°19°, low 49°9°. Typical 60°16° / 41°5°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  20% chance · 0.01 in0.3 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–72°22°
Low, likely
38°3°–54°12°
Typical high / low
60°16° / 41°5°
Wind
11 mph18 km/h, gusts 24 mph39 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 67°19°, low 52°11°. Typical 60°16° / 40°4°. Rain 0.05 in1.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–75°24°
Low, likely
42°6°–58°14°
Typical high / low
60°16° / 40°4°
Wind
10 mph17 km/h, gusts 19 mph30 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 34°.
Tomorrow
Dry, high 65°, low 37°, warming up.
Monday
Dry, high 69°, low 48°, warming up.
Rest of week
Mostly dry, highs 62–71°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (LWX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Deer Creek (MD) at Rocks State Park

4.1 mi

Below flood stage

Level: 2.0 ft
Flow: 42 cfs

Reading from Sat 6:15 AM · NWS gauge page

Muddy Creek (PA) near Castle Fin

7.0 mi

Level: 3.1 ft
Flow: 63 cfs

Reading from Sat 6:30 AM · NWS gauge page

Bynum Run at Bel Air

11 mi

Below flood stage

Level: 0.7 ft
Flow: under 1 cfs

Reading from Sat 6:15 AM · NWS gauge page

Deer Creek (MD) near Darlington

12 mi

Below flood stage

Level: 1.2 ft
Flow: 74 cfs

Reading from Sat 6:15 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 61% less heating than a typical week.

This week 34Typical 87

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 26
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 20 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

Today, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Conowingo Dam · official normals 1991–2020 · records 1936–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° colder than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

Pylesville weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 48 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 27 min less
Golden hour: 5:36–6:30 PM; Morning 7:08–8:02 AM
Blue hour: 6:30–6:41 PM; Morning 6:57–7:08 AM; first light 6:57 AM

Stars tonight? Fair

Clear 6:41 PM–6:58 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:37 AM · rises 5:10 PM
Full moon: Oct 26
New moon: Nov 9

Looking east from Pylesville. The highest point on the skyline is about 5,700 ft, 8 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Frost Advisory

Pylesville, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Deer Creek (MD) at Rocks State Park

Muddy Creek (PA) near Castle Fin

Bynum Run at Bel Air

Deer Creek (MD) near Darlington

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon