Frost Advisory
Starts in 4 h 17 min
When
From 1 AM to 9 AM EDT Sunday.
Where
Portions of central, northeast, and northern Maryland and northern Virginia.
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 Montgomery; Northwest Howard; Northwest Harford; Southeast Harford; Rappahannock; Culpeper; Northern Fauquier; Southern Fauquier; Western Loudoun; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park
See it on weather.gov (opens in a new tab)

Observed 7:47 PM EDT at KFDK

Libertytown, MD weather

Clear and 46°8°.

Forecasts agree

Now 46°8°

Clear

Wind: Calm; Light through 8 AM
Dew point: 45°7°; Comfortable · down to 36°2° by 3 AM
Humidity: 93%; Air 46°8°, dew point 45°7° · fog or dew likely
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 30Good; Ozone · tomorrow moderate
Pressure: 30.55 inHg1035 hPa; Rising slowly · +0.03 inHg+1.0 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 36°2° tomorrow at 7 AM
Above 50°10° tomorrow by 11 AM
High 62°17° tomorrow at 2 PM
Below 50°10° tomorrow night after 9 PM

TonightDown to 37°3° by 4 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 62°17° by 2 PM · Clear
Tomorrow nightDown to 38°3° by 5 AM · Clear
Monday morningUp to 55°13° by 11 AM · Clear
Monday afternoonUp to 68°20° by 3 PM · 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 8p	Clear	48°9° (likely 47°8° to 50°10°)	48°9°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	71%	18%	0
Sat 9p	Clear	46°8° (likely 44°7° to 49°9°)	46°8°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	76%	0%	0
Sat 10p	Clear	44°7° (likely 42°6° to 47°8°)	44°7°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	82%	0%	0
Sat 11p	Clear	42°6° (likely 40°4° to 45°7°)	42°6°	0%	1 mph2 km/h from SE, gusts 8 mph12 km/h	89%	0%	0
Sun 12a	Clear	41°5° (likely 39°4° to 44°7°)	41°5°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	89%	0%	0
Sun 1a	Clear	41°5° (likely 39°4° to 44°7°)	41°5°	0%	1 mph2 km/h from SE, gusts 3 mph4 km/h	89%	7%	0
Sun 2a	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	1 mph2 km/h from SE, gusts 3 mph4 km/h	92%	9%	0
Sun 3a	Clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	2 mph3 km/h from SE, gusts 4 mph6 km/h	92%	9%	0
Sun 4a	Clear	37°3° (likely 36°2° to 41°5°)	37°3°	0%	2 mph3 km/h from E, gusts 3 mph4 km/h	96%	1%	0
Sun 5a	Clear	37°3° (likely 35°2° to 41°5°)	37°3°	0%	2 mph3 km/h from E, gusts 2 mph4 km/h	96%	0%	0
Sun 6a	Clear	37°3° (likely 34°1° to 41°5°)	37°3°	0%	2 mph3 km/h from E, gusts 2 mph4 km/h	96%	0%	0
Sun 7a	Sunny	36°2° (likely 34°1° to 40°4°)	36°2°	0%	2 mph3 km/h from E, gusts 3 mph4 km/h	96%	1%	0
Sun 8a	Sunny	37°3° (likely 34°1° to 40°4°)	37°3°	0%	1 mph2 km/h from E, gusts 3 mph4 km/h	96%	0%	0
Sun 9a	Sunny	42°6° (likely 39°4° to 44°7°)	42°6°	0%	1 mph2 km/h from E, gusts 3 mph4 km/h	89%	1%	1
Sun 10a	Sunny	49°9° (likely 49°9° to 51°11°)	49°9°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	77%	2%	2
Sun 11a	Sunny	54°12° (likely 54°12° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 6 mph9 km/h	69%	3%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	1 mph2 km/h from S, gusts 7 mph12 km/h	62%	3%	4
Sun 1p	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	1 mph2 km/h from S, gusts 7 mph10 km/h	55%	5%	4
Sun 2p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	1 mph2 km/h from S, gusts 7 mph11 km/h	52%	7%	4
Sun 3p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	1 mph2 km/h from S, gusts 7 mph12 km/h	52%	3%	4
Sun 4p	Sunny	62°17° (likely 62°17° to 63°17°)	62°17°	0%	1 mph2 km/h from S, gusts 7 mph12 km/h	54%	3%	3
Sun 5p	Sunny	62°17° (likely 61°16° to 62°17°)	62°17°	0%	1 mph2 km/h from S, gusts 7 mph11 km/h	54%	1%	1
Sun 6p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	60%	0%	0
Sun 7p	Clear	54°12° (likely 53°12° to 54°12°)	54°12°	0%	1 mph2 km/h from S, gusts 5 mph7 km/h	69%	1%	0
Sun 8p	Clear	52°11° (likely 51°11° to 52°11°)	52°11°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	74%	1%	0
Sun 9p	Clear	47°8° (likely 47°8° to 50°10°)	47°8°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	86%	0%	0
Sun 10p	Clear	45°7° (likely 45°7° to 48°9°)	45°7°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	89%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	1 mph2 km/h from S, gusts 3 mph5 km/h	96%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	96%	3%	0
Mon 1a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	96%	3%	0
Mon 2a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	96%	2%	0
Mon 3a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	96%	2%	0
Mon 4a	Clear	39°4° (likely 39°4° to 42°6°)	39°4°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	100%	11%	0
Mon 5a	Clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	100%	14%	0
Mon 6a	Clear	38°3° (likely 38°3° to 41°5°)	38°3°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	100%	16%	0
Mon 7a	Clear	37°3° (likely 37°3° to 40°4°)	37°3°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	100%	16%	0
Mon 8a	Sunny	38°3° (likely 38°3° to 41°5°)	38°3°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	96%	21%	0
Mon 9a	Sunny	43°6° (likely 40°4° to 45°7°)	43°6°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	93%	20%	1
Mon 10a	Sunny	49°9° (likely 49°9° to 53°12°)	49°9°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	80%	8%	2
Mon 11a	Sunny	55°13° (likely 55°13° to 58°14°)	55°13°	0%	2 mph3 km/h from W, gusts 7 mph11 km/h	69%	0%	3
Mon 12p	Sunny	60°16° (likely 60°16° to 62°17°)	60°16°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	60%	0%	4
Mon 1p	Sunny	63°17° (likely 63°17° to 65°18°)	63°17°	0%	3 mph5 km/h from NW, gusts 8 mph13 km/h	54%	0%	4
Mon 2p	Sunny	66°19° (likely 66°19° to 67°19°)	66°19°	0%	5 mph8 km/h from NW, gusts 9 mph15 km/h	50%	0%	4
Mon 3p	Sunny	68°20° (likely 66°19° to 68°20°)	68°20°	0%	5 mph8 km/h from NW, gusts 9 mph15 km/h	49%	0%	4
Mon 4p	Sunny	68°20° (likely 66°19° to 68°20°)	68°20°	0%	2 mph3 km/h from NW, gusts 10 mph16 km/h	51%	2%	3
Mon 5p	Sunny	68°20° (likely 65°18° to 68°20°)	68°20°	0%	2 mph3 km/h from NW, gusts 9 mph14 km/h	51%	0%	1
Mon 6p	Clear	65°18° (likely 59°15° to 65°18°)	65°18°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	56%	0%	0
Mon 7p	Clear	61°16° (likely 55°13° to 61°16°)	61°16°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	62%	2%	0

Days ahead

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

Today, Oct 24. Mostly sunny. High 60°16°, low 34°1°. Typical 63°17° / 40°4°. Dry. Forecasts agree.
1. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Tonight: Patchy frost after 4am. Mostly clear, with a low around 34. Southeast wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–61°16°
Low, likely
33°1°–34°1°
Typical high / low
63°17° / 40°4°
Wind
6 mph9 km/h, gusts 12 mph20 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 36°2°. Typical 63°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 63. Southeast wind around 2 mph.
Night: Clear, with a low around 36. South wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–63°17°
Low, likely
34°1°–40°4°
Typical high / low
63°17° / 40°4°
Wind
6 mph10 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 69°21°, low 46°8°. Typical 62°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Official NWS forecast
Day: Patchy frost between 7am and 8am. Sunny, with a high near 69. West wind 1 to 5 mph.
Night: Mostly clear, with a low around 46. Northwest wind around 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–69°21°
Low, likely
39°4°–46°8°
Typical high / low
62°17° / 40°4°
Wind
6 mph10 km/h, gusts 13 mph21 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 42°6°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 42°5°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Mostly clear, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
41°5°–48°9°
Typical high / low
62°17° / 39°4°
Wind
12 mph19 km/h, gusts 20 mph32 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 64°18°, low 46°8°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
38°3°–46°8°
Typical high / low
62°17° / 39°4°
Wind
8 mph12 km/h, gusts 14 mph22 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 48°9°. Typical 61°16° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  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 69.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–69°21°
Low, likely
45°7°–48°9°
Typical high / low
61°16° / 39°4°
Wind
8 mph13 km/h, gusts 21 mph34 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 73°23°, low 50°10°. Typical 61°16° / 38°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 73.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–74°23°
Low, likely
44°7°–50°10°
Typical high / low
61°16° / 38°3°
Wind
9 mph14 km/h, gusts 15 mph24 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 71°22°, low 47°8°. Typical 60°16° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
60°16°–72°22°
Low, likely
44°7°–52°11°
Typical high / low
60°16° / 38°3°
Wind
10 mph16 km/h, gusts 19 mph30 km/h
UV peak
3
Sunday, Nov 1. Drizzle. High 69°21°, low 51°11°. Typical 60°16° / 38°3°. Rain 0.02 in0.5 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  30% chance · 0.07 in1.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 60°16°
  30% chance · 0.13 in3.2 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–71°22°
Low, likely
48°9°–55°13°
Typical high / low
60°16° / 38°3°
Wind
13 mph21 km/h, gusts 32 mph51 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 72°22°, low 58°14°. Typical 60°16° / 37°3°. Rain 0.66 in17 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 62°16°
  30% chance · 0.06 in1.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 72°22°
  20% chance · 0.07 in1.8 mm
3. Evening
  6 PM–midnight
  Clear, 62°17°
  30% chance · 0.53 in14 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–76°24°
Low, likely
55°13°–65°18°
Typical high / low
60°16° / 37°3°
Wind
20 mph32 km/h, gusts 39 mph62 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 60°, low 34°.
Tomorrow
Dry, high 63°, low 36°, warming up.
Monday
Dry, high 69°, low 46°, warming up.
Rest of week
Mostly dry, highs 64–73°.

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

Monocacy River near Frederick at Interstate 70

8.3 mi

Below flood stage

Level: 1.7 ft
Flow: 173 cfs

Forecast peak 1.7 ft Sat 8 PM

Reading from Sat 6:30 PM · NWS gauge page

Monocacy River at Monocacy Blvd. in Frederick

7.4 mi

Below flood stage

Level: 1.6 ft
Flow: 116 cfs

Reading from Sat 6:15 PM · NWS gauge page

Big Pipe Creek at Bruceville

8.6 mi

Below flood stage

Level: 1.0 ft
Flow: 24 cfs

Reading from Sat 7 PM · NWS gauge page

Monocacy River at Bridgeport

13 mi

Below flood stage

Level: 2.4 ft
Flow: 18 cfs

Reading from Sat 6:30 PM · NWS gauge page

For your home

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

Heating this week

About 69% less heating than a typical week.

This week 32Typical 101

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 45°F).

Open the windows?

Sun, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Emmitsburg 2 SE · official normals 1991–2020 · records 1956–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

On average 5°3° colder than normal (daily mean temperature).

−7°−4°MonOct 19
±0°TueOct 20
−5°−3°WedOct 21
−4°−2°ThuOct 22
−8°−4°FriOct 23
—SatOct 24
—SunOct 25

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

Sun & moon

Sun

Daylight: 10 h 49 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 26 min less
Golden hour: 5:40–6:34 PM; Morning 7:11–8:05 AM
Blue hour: 6:34–6:44 PM; Morning 7:01–7:11 AM; first light 7:01 AM

Stars tonight? Fair

Clear 8:43 PM–7:02 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:40 AM · rises 5:13 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from Libertytown. The highest point on the skyline is about 2,500 ft, 28 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

Libertytown, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Monocacy River near Frederick at Interstate 70

Monocacy River at Monocacy Blvd. in Frederick

Big Pipe Creek at Bruceville

Monocacy River at Bridgeport

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