Frost Advisory
Starts in 12 min
When
Until 9 AM EDT Sunday.
Where
In Maryland, Northwest Howard, Northwest Montgomery, Cecil, and Southeast Harford Counties. In Virginia, Central and Southeast Prince William/Manassas/Manassas Park, Eastern Loudoun, Northwest Prince William, and Rappahannock Counties.
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: Cecil; Northwest Montgomery; Northwest Howard; Southeast Harford; Rappahannock; Eastern Loudoun; Northwest Prince William; Central and Southeast Prince William/Manassas/Manassas Park
See it on weather.gov (opens in a new tab)

Observed 12:15 AM EDT at KMTN

Aberdeen Proving Ground, MD weather

Clear and 43°6°.

Mostly agree

Now 43°6°

Clear

Wind: Calm; Light through 12 PM
Dew point: 41°5°; Comfortable
Humidity: 93%; Air 43°6°, dew point 41°5° · fog or dew likely
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 60Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.58 inHg1036 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

9°5° cooler than this time yesterday (52°11° then, 43°6° now)

Good hours for

Above 50°10° today by 10 AM
High 66°19° today at 3 PM
Drops 13°7° today 5–8 PM (64°18° → 51°11°)
Below 50°10° tonight after 8 PM
Drops 12°7° tomorrow 5–8 PM (69°21° → 57°14°)

TonightDown to 36°2° by 5 AM · Clear
This morningUp to 60°16° by 11 AM · Clear
This afternoonNear 64°18° · Clear
TonightDown to 36°2° by 5 AM · Clear
Tomorrow morningUp to 60°16° by 11 AM · Clear
Tomorrow afternoonUp to 70°21° by 3 PM · Clear
Tomorrow nightDown to 50°10° by 11 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
Sun 12a	Clear	43°6° (likely 43°6° to 50°10°)	43°6°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	89%	0%	0
Sun 1a	Clear	40°4° (likely 40°4° to 50°10°)	40°4°	0%	1 mph2 km/h from E, gusts 6 mph9 km/h	96%	0%	0
Sun 2a	Clear	37°3° (likely 37°3° to 49°9°)	37°3°	0%	0 mph0 km/h, gusts 5 mph9 km/h	100%	1%	0
Sun 3a	Clear	37°3° (likely 37°3° to 48°9°)	37°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	10%	0
Sun 4a	Clear	37°3° (likely 37°3° to 47°8°)	37°3°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	100%	13%	0
Sun 5a	Clear	36°2° (likely 36°2° to 45°7°)	36°2°	0%	1 mph2 km/h from N, gusts 5 mph9 km/h	100%	14%	0
Sun 6a	Clear	35°2° (likely 35°2° to 46°8°)	35°2°	0%	1 mph2 km/h from N, gusts 6 mph9 km/h	100%	13%	0
Sun 7a	Sunny	35°2° (likely 35°2° to 45°7°)	35°2°	0%	1 mph2 km/h from N, gusts 6 mph10 km/h	100%	13%	0
Sun 8a	Sunny	36°2° (likely 36°2° to 45°7°)	36°2°	0%	1 mph2 km/h from N, gusts 6 mph10 km/h	100%	13%	0
Sun 9a	Sunny	45°7° (likely 45°7° to 48°9°)	45°7°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	86%	8%	1
Sun 10a	Sunny	54°12° (likely 51°11° to 54°12°)	54°12°	0%	1 mph2 km/h from N, gusts 4 mph7 km/h	66%	0%	2
Sun 11a	Sunny	60°16° (likely 55°13° to 60°16°)	60°16°	0%	1 mph2 km/h from NE, gusts 3 mph5 km/h	53%	1%	3
Sun 12p	Sunny	63°17° (likely 58°14° to 63°17°)	63°17°	0%	1 mph2 km/h from NE, gusts 2 mph4 km/h	48%	1%	4
Sun 1p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	45%	1%	4
Sun 2p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	43%	2%	4
Sun 3p	Sunny	66°19° (likely 61°16° to 66°19°)	66°19°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	43%	1%	4
Sun 4p	Sunny	66°19° (likely 61°16° to 66°19°)	66°19°	0%	0 mph0 km/h, gusts 5 mph8 km/h	43%	0%	3
Sun 5p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	1 mph2 km/h from S, gusts 5 mph9 km/h	48%	0%	1
Sun 6p	Clear	59°15° (likely 57°14° to 60°16°)	59°15°	0%	0 mph0 km/h, gusts 5 mph8 km/h	57%	0%	0
Sun 7p	Clear	51°11° (likely 51°11° to 58°14°)	51°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	77%	0%	0
Sun 8p	Clear	45°7° (likely 45°7° to 56°13°)	45°7°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	0%	0
Sun 9p	Clear	42°6° (likely 42°6° to 55°13°)	42°6°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 10p	Clear	41°5° (likely 41°5° to 54°12°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 11p	Clear	40°4° (likely 40°4° to 53°12°)	40°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	100%	0%	0
Mon 12a	Clear	39°4° (likely 39°4° to 52°11°)	39°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	1%	0
Mon 1a	Clear	39°4° (likely 39°4° to 50°10°)	39°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Mon 2a	Clear	37°3° (likely 37°3° to 49°9°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	1%	0
Mon 3a	Clear	37°3° (likely 37°3° to 49°9°)	37°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	6%	0
Mon 4a	Clear	37°3° (likely 37°3° to 47°8°)	37°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	11%	0
Mon 5a	Clear	36°2° (likely 36°2° to 47°8°)	36°2°	0%	1 mph2 km/h from NW, gusts 5 mph7 km/h	100%	12%	0
Mon 6a	Clear	36°2° (likely 36°2° to 47°8°)	36°2°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	100%	14%	0
Mon 7a	Sunny	36°2° (likely 36°2° to 46°8°)	36°2°	0%	1 mph2 km/h from NW, gusts 4 mph7 km/h	100%	11%	0
Mon 8a	Sunny	36°2° (likely 36°2° to 47°8°)	36°2°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	100%	11%	0
Mon 9a	Sunny	46°8° (likely 45°7° to 50°10°)	46°8°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	100%	8%	1
Mon 10a	Sunny	55°13° (likely 52°11° to 55°13°)	55°13°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	77%	2%	2
Mon 11a	Sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	2 mph3 km/h from W, gusts 8 mph12 km/h	64%	0%	3
Mon 12p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	58%	9%	4
Mon 1p	Sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	52%	7%	4
Mon 2p	Sunny	69°21° (likely 65°18° to 69°21°)	69°21°	0%	5 mph8 km/h from W, gusts 8 mph12 km/h	51%	0%	4
Mon 3p	Sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	5 mph8 km/h from W, gusts 9 mph14 km/h	47%	0%	4
Mon 4p	Sunny	70°21° (likely 65°18° to 70°21°)	70°21°	0%	3 mph5 km/h from W, gusts 9 mph15 km/h	49%	0%	3
Mon 5p	Sunny	69°21° (likely 63°17° to 69°21°)	69°21°	0%	2 mph3 km/h from W, gusts 8 mph13 km/h	53%	0%	1
Mon 6p	Clear	64°18° (likely 59°15° to 65°18°)	64°18°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	65%	0%	0
Mon 7p	Clear	57°14° (likely 56°13° to 61°16°)	57°14°	0%	1 mph2 km/h from W, gusts 6 mph10 km/h	80%	0%	0
Mon 8p	Clear	53°12° (likely 53°12° to 59°15°)	53°12°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	89%	2%	0
Mon 9p	Clear	52°11° (likely 52°11° to 56°13°)	52°11°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	93%	0%	0
Mon 10p	Clear	51°11° (likely 51°11° to 56°13°)	51°11°	0%	1 mph2 km/h from NW, gusts 7 mph12 km/h	96%	0%	0
Mon 11p	Clear	50°10° (likely 49°9° to 56°13°)	50°10°	0%	2 mph3 km/h from NW, gusts 8 mph12 km/h	100%	0%	0

Days ahead

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

Today, Oct 25. Fog. High 66°19°, low 35°2°. Typical 64°18° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 36°2°
  Dry
Official NWS forecast
Today: Areas of frost and patchy fog before 9am. Sunny, with a high near 66. East wind around 1 mph.
Tonight: Areas of frost between 1am and 2am, then areas of frost and patchy fog. Clear, with a low around 35. North wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–66°19°
Low, likely
35°2°–45°7°
Typical high / low
64°18° / 43°6°
Wind
6 mph10 km/h
UV peak
4
Tomorrow, Oct 26. Sunny. High 70°21°, low 47°8°. Typical 63°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  Dry
Official NWS forecast
Day: Patchy frost and patchy fog before 10am. Sunny, with a high near 70. West wind 1 to 5 mph.
Night: Clear, with a low around 47. Northwest wind 1 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
66°19°–70°21°
Low, likely
40°4°–47°8°
Typical high / low
63°17° / 42°6°
Wind
7 mph12 km/h, gusts 13 mph21 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 67°19°, low 41°5°. Typical 63°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 67.
Night: Mostly clear, with a low around 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
41°5°–53°12°
Typical high / low
63°17° / 42°6°
Wind
11 mph17 km/h, gusts 24 mph38 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 66°19°, low 46°8°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  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
62°17°–66°19°
Low, likely
45°7°–50°10°
Typical high / low
62°17° / 42°6°
Wind
9 mph14 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 49°9°. Typical 62°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°15°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 53°12°
  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 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
49°9°–53°12°
Typical high / low
62°17° / 42°6°
Wind
8 mph12 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 73°23°, low 50°10°. Typical 62°17° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 54°12°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–75°24°
Low, likely
50°10°–54°12°
Typical high / low
62°17° / 41°5°
Wind
8 mph13 km/h, gusts 15 mph24 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 71°22°, low 52°11°. Typical 61°16° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 53°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–71°22°
Low, likely
50°10°–54°12°
Typical high / low
61°16° / 41°5°
Wind
9 mph15 km/h, gusts 18 mph29 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 67°19°, low 54°12°. Typical 61°16° / 40°4°. Rain 0.02 in0.5 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  20% chance · 0.04 in1 mm
4. Overnight
  midnight–6 AM
  Drizzle, 62°17°
  30% chance · 0.13 in3.3 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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–71°22°
Low, likely
49°9°–58°14°
Typical high / low
61°16° / 40°4°
Wind
13 mph21 km/h, gusts 29 mph47 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 70°21°, low 61°16°. Typical 60°16° / 40°4°. Rain 0.27 in6.9 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  30% chance · 0.12 in3.1 mm
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 64°18°
  20% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 59°15°
  20% chance · 0.1 in2.6 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
68°20°–74°23°
Low, likely
58°14°–67°19°
Typical high / low
60°16° / 40°4°
Wind
20 mph32 km/h, gusts 36 mph58 km/h
UV peak
3
Tuesday, Nov 3. Cloudy. High 70°21°, low 56°13°. Typical 60°16° / 40°4°. Rain 0.13 in3.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 60°15°
  20% chance · 0.06 in1.6 mm
2. Afternoon
  noon–6 PM
  Partly sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  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
66°19°–77°25°
Low, likely
51°11°–60°16°
Typical high / low
60°16° / 40°4°
Wind
14 mph22 km/h, gusts 34 mph54 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 66°, low 35°.
Tomorrow
Dry, high 70°, low 47°, warming up.
Tuesday
Dry, high 67°, low 41°, cooling off.
Rest of week
Mostly dry, highs 66–73°.

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

Chesapeake Bay at Havre de Grace (IN MLLW)

6.2 mi

Below flood stage

Level: 3.1 ft

Forecast peak 4.0 ft Sun 10 PM, minor flooding

Reading from Sat 11 PM · NWS gauge page

Swan Creek at Swan Creek

4.7 mi

Below flood stage

Level: 2.9 ft

Reading from Sat 11:15 PM · NWS gauge page

James Run near Belcamp

7.2 mi

Below flood stage

Level: 3.0 ft
Flow: 6 cfs

Reading from Sat 11:30 PM · NWS gauge page

Bynum Run near Abingdo

8.0 mi

Level: 2.6 ft

Reading from Sat 10:45 PM · NWS gauge page

For your home

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

Heating this week

About 66% less heating than a typical week.

This week 30Typical 90

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 23
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 41°F).

Open the windows?

Today, 11:00 AM–5:00 PM

Good stretch to open the windows.

Is this typical?

ABERDEEN PHILLIPS FLD · official normals 1991–2020 · records 1919–2026

Oct 25, today vs a typical year

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

Last 7 days vs normal

On average 1°0° warmer than normal (daily mean temperature).

−6°−4°MonOct 19
−1°TueOct 20
+6°+3°WedOct 21
+2°+1°ThuOct 22
+3°+2°FriOct 23
—SatOct 24
—SunOct 25

Aberdeen Proving Ground weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 23 min less
Golden hour: 5:34–6:28 PM; Morning 7:08–8:02 AM
Blue hour: 6:28–6:39 PM; Morning 6:57–7:08 AM; first light 6:57 AM

Stars tonight? Fair

Clear 12:48–6:57 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

99% lit · growing

Today: sets 6:47 AM · rises 5:37 PM
Full moon: Oct 26
New moon: Nov 9

Looking north from Aberdeen Proving Ground. The highest point on the skyline is about 5,100 ft, 19 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

Aberdeen Proving Ground, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Tuesday

Rest of week

What changed since yesterday

Radar

Rivers

Chesapeake Bay at Havre de Grace (IN MLLW)

Swan Creek at Swan Creek

James Run near Belcamp

Bynum Run near Abingdo

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 25, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon