Frost Advisory
Starts in 8 h 4 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 4:15 PM EDT at KJYO

Lansdowne, VA weather

Sunny and 63°17°, jacket by 7 PM.

Forecasts agree

Now 63°17°

Sunny

Wind: 8 mph13 km/h; From the southeast. Up to 8 mph13 km/h through 4 AM
Dew point: 43°6°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 33Good; Ozone · tomorrow moderate
Pressure: 30.51 inHg1033 hPa; Falling slowly · −0.03 inHg−1.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (63°17° then, 63°17° now)

Good hours for

Below 50°10° tonight after 8 PM
Low 35°2° tomorrow at 6 AM
Above 50°10° tomorrow by 11 AM

This afternoonNear 62°17° · Clear
TonightDown to 36°2° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 5 PM · Clear
Tomorrow nightDown to 37°3° by 5 AM · Clear
Monday morningUp to 56°13° by 11 AM · Partly cloudy
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 4p	Mostly sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	43%	16%	3
Sat 5p	Mostly sunny	61°16° (likely 59°15° to 63°17°)	61°16°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	48%	16%	1
Sat 6p	Mostly clear	59°15° (likely 56°13° to 60°16°)	59°15°	0%	3 mph5 km/h from E, gusts 8 mph13 km/h	51%	42%	0
Sat 7p	Mostly clear	55°13° (likely 52°11° to 57°14°)	55°13°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	59%	30%	0
Sat 8p	Clear	49°9° (likely 49°9° to 53°12°)	48°9°	0%	3 mph5 km/h from E, gusts 8 mph13 km/h	77%	18%	0
Sat 9p	Clear	45°7° (likely 45°7° to 51°11°)	45°7°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	89%	14%	0
Sat 10p	Clear	42°6° (likely 42°6° to 49°9°)	42°6°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	100%	5%	0
Sat 11p	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	100%	0%	0
Sun 12a	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	10%	0
Sun 1a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	14%	0
Sun 2a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	16%	0
Sun 3a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	14%	0
Sun 4a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	16%	0
Sun 5a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	16%	0
Sun 6a	Clear	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	18%	0
Sun 7a	Sunny	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	18%	0
Sun 8a	Sunny	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	17%	0
Sun 9a	Mostly sunny	41°5° (likely 41°5° to 45°7°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	96%	31%	1
Sun 10a	Sunny	48°9° (likely 48°9° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	83%	2%	2
Sun 11a	Sunny	54°12° (likely 54°12° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 5 mph8 km/h	71%	4%	3
Sun 12p	Sunny	57°14° (likely 57°14° to 60°16°)	57°14°	0%	1 mph2 km/h from E, gusts 5 mph7 km/h	64%	3%	4
Sun 1p	Sunny	59°15° (likely 59°15° to 63°17°)	59°15°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	60%	3%	4
Sun 2p	Sunny	62°17° (likely 62°17° to 64°18°)	62°17°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	54%	7%	4
Sun 3p	Sunny	63°17° (likely 63°17° to 65°18°)	63°17°	0%	1 mph2 km/h from S, gusts 6 mph10 km/h	52%	7%	4
Sun 4p	Sunny	64°18° (likely 64°18° to 65°18°)	64°18°	0%	1 mph2 km/h from S, gusts 7 mph11 km/h	52%	8%	3
Sun 5p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	1 mph2 km/h from S, gusts 6 mph10 km/h	50%	3%	1
Sun 6p	Clear	62°17° (likely 59°15° to 62°17°)	62°17°	0%	0 mph0 km/h, gusts 5 mph8 km/h	56%	0%	0
Sun 7p	Clear	57°14° (likely 55°13° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph7 km/h	64%	0%	0
Sun 8p	Clear	53°12° (likely 52°11° to 54°12°)	53°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	74%	1%	0
Sun 9p	Clear	47°8° (likely 47°8° to 53°12°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	0%	0
Sun 10p	Clear	45°7° (likely 45°7° to 53°12°)	45°7°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 49°9°)	43°6°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	0%	0
Mon 1a	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	1%	0
Mon 2a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	1 mph2 km/h from W, gusts 2 mph4 km/h	100%	11%	0
Mon 3a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	1 mph2 km/h from W, gusts 3 mph4 km/h	100%	15%	0
Mon 4a	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	1 mph2 km/h from W, gusts 2 mph3 km/h	100%	17%	0
Mon 5a	Clear	37°3° (likely 37°3° to 43°6°)	37°3°	0%	1 mph2 km/h from W, gusts 2 mph4 km/h	100%	16%	0
Mon 6a	Clear	37°3° (likely 37°3° to 42°6°)	37°3°	0%	1 mph2 km/h from NW, gusts 2 mph3 km/h	100%	26%	0
Mon 7a	Partly cloudy	36°2° (likely 35°2° to 41°5°)	36°2°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	100%	35%	0
Mon 8a	Partly sunny	37°3° (likely 35°2° to 42°6°)	37°3°	0%	1 mph2 km/h from NW, gusts 3 mph4 km/h	100%	42%	0
Mon 9a	Partly sunny	42°6° (likely 38°3° to 46°8°)	42°6°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	96%	61%	1
Mon 10a	Mostly sunny	49°9° (likely 46°8° to 53°12°)	48°9°	0%	3 mph5 km/h from NW, gusts 7 mph11 km/h	80%	19%	2
Mon 11a	Sunny	56°13° (likely 54°12° to 59°15°)	56°13°	0%	3 mph5 km/h from NW, gusts 9 mph14 km/h	66%	0%	3
Mon 12p	Sunny	61°16° (likely 60°16° to 63°17°)	61°16°	0%	3 mph5 km/h from NW, gusts 9 mph14 km/h	58%	0%	4
Mon 1p	Sunny	64°18° (likely 63°17° to 66°19°)	64°18°	0%	5 mph8 km/h from NW, gusts 9 mph14 km/h	54%	0%	4
Mon 2p	Sunny	67°19° (likely 65°18° to 68°20°)	67°19°	0%	5 mph8 km/h from NW, gusts 10 mph15 km/h	49%	0%	4
Mon 3p	Sunny	68°20° (likely 66°19° to 69°21°)	68°20°	0%	5 mph8 km/h from NW, gusts 11 mph18 km/h	49%	0%	4

Days ahead

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

Today, Oct 24. Mostly sunny. High 63°17°, low 35°2°. Typical 65°18° / 42°6°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Mostly sunny, 63°17°
  Dry
2. Evening
  6 PM–midnight
  Clear, 49°9°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Today: Sunny, with a high near 63. Southeast wind around 5 mph.
Tonight: Patchy fog between 2am and 4am, then areas of frost and patchy fog. Mostly clear, with a low around 35. East wind 0 to 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–63°17°
Low, likely
34°1°–37°3°
Typical high / low
65°18° / 42°6°
Wind
5 mph8 km/h, gusts 12 mph20 km/h
UV peak
4
Tomorrow, Oct 25. Fog. High 65°18°, low 36°2°. Typical 64°18° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Day: Areas of frost and patchy fog before 9am. Sunny, with a high near 65. South wind around 1 mph.
Night: Patchy frost after 5am. Mostly clear, with a low around 36. West wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–65°18°
Low, likely
35°2°–40°4°
Typical high / low
64°18° / 42°6°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 46°8°. Typical 64°18° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 37°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 before 9am. Sunny, with a high near 70. Northwest wind 1 to 5 mph.
Night: Mostly clear, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–70°21°
Low, likely
35°2°–46°8°
Typical high / low
64°18° / 41°5°
Wind
7 mph12 km/h, gusts 14 mph23 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 68°20°, low 44°7°. Typical 64°18° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Mostly clear, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–68°20°
Low, likely
42°6°–49°9°
Typical high / low
64°18° / 41°5°
Wind
9 mph15 km/h, gusts 15 mph24 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 66°19°, low 46°8°. Typical 64°18° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  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 66.
Night: Mostly cloudy, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
63°17°–66°19°
Low, likely
40°4°–47°8°
Typical high / low
64°18° / 41°5°
Wind
7 mph11 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 71°22°, low 48°9°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly 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
66°19°–71°22°
Low, likely
43°6°–48°9°
Typical high / low
63°17° / 40°4°
Wind
7 mph11 km/h, gusts 24 mph38 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 74°23°, low 49°9°. Typical 63°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°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 74.
Night: Mostly clear, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–74°23°
Low, likely
43°6°–49°9°
Typical high / low
63°17° / 40°4°
Wind
8 mph13 km/h, gusts 26 mph42 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 72°22°, low 48°9°. Typical 62°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
69°21°–75°24°
Low, likely
44°7°–51°11°
Typical high / low
62°17° / 40°4°
Wind
7 mph11 km/h, gusts 28 mph44 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 69°21°, low 53°12°. Typical 62°17° / 40°4°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 64°18°
  30% chance · 0.01 in0.3 mm
4. Overnight
  midnight–6 AM
  Drizzle, 62°17°
  30% chance · 0.06 in1.5 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
63°17°–72°22°
Low, likely
52°11°–55°13°
Typical high / low
62°17° / 40°4°
Wind
9 mph15 km/h, gusts 22 mph36 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 72°22°, low 57°14°. Typical 62°17° / 39°4°. Rain 0.48 in12 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  20% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  20% chance · 0.46 in12 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
63°17°–77°25°
Low, likely
50°10°–65°18°
Typical high / low
62°17° / 39°4°
Wind
17 mph28 km/h, gusts 39 mph63 km/h

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 35°.
Tomorrow
Dry, high 65°, low 36°.
Monday
Dry, high 70°, low 46°, warming up.
Rest of week
Mostly dry, highs 66–74°.

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

Potomac River at Edwards Ferry

1.1 mi

Below flood stage

Level: 3.9 ft

Forecast peak 3.9 ft Sat 8 PM

Reading from Sat 3:45 PM · NWS gauge page

Goose Creek near Leesburg

6.8 mi

Below flood stage

Level: 1.5 ft
Flow: 106 cfs

Forecast peak 1.6 ft Sun 2 AM

Reading from Sat 3:45 PM · NWS gauge page

Seneca Creek at Dawsonville

8.5 mi

Below flood stage

Level: 2.0 ft
Flow: 55 cfs

Forecast peak 2.0 ft Sat 8 PM

Reading from Sat 3:50 PM · NWS gauge page

Broad Run near Sterling

3.8 mi

Below flood stage

Level: 1.8 ft
Flow: 50 cfs

Reading from Sat 3:40 PM · NWS gauge page

For your home

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

Heating this week

About 62% less heating than a typical week.

This week 33Typical 88

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 22 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 43°F).

Open the windows?

Sun, 2:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Washington Dulles International Airport · official normals 1991–2020 · records 1960–2026

Oct 24, today vs a typical year

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

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−6°−3°SunOct 18
−3°−2°MonOct 19
+2°+1°TueOct 20
±0°WedOct 21
−2°−1°ThuOct 22
−1°FriOct 23
—SatOct 24

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

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 25 min less
Golden hour: 5:41–6:35 PM; Morning 7:12–8:05 AM
Blue hour: 6:35–6:46 PM; Morning 7:01–7:12 AM; first light 7:01 AM

Stars tonight? Fair

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

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:41 AM · rises 5:15 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Lansdowne. The highest point on the skyline is about 3,900 ft, 58 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

Lansdowne, VA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Potomac River at Edwards Ferry

Goose Creek near Leesburg

Seneca Creek at Dawsonville

Broad Run near Sterling

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