Frost Advisory
Starts in 24 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 KILG

Port Deposit, MD weather

Clear and 41°5°.

Mostly agree

Now 41°5°

Clear · Feels like 38°3°

Wind: 5 mph7 km/h; From the north-northwest. Light through 12 PM
Dew point: 37°3°; Comfortable
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 60Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.56 inHg1035 hPa; Steady over the next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Low 34°1° today at 7 AM
Above 50°10° today by 10 AM
High 64°18° today at 3 PM
Drops 12°7° tonight 6–9 PM (57°14° → 45°7°)
Below 50°10° tonight after 8 PM

TonightDown to 35°2° by 3 AM · Clear
This morningUp to 57°14° by 11 AM · Clear
This afternoonUp to 64°18° by 3 PM · Clear
TonightDown to 37°3° by 2 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 68°20° by 4 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	44°7° (likely 43°6° to 48°9°)	44°7°	0%	1 mph2 km/h from S, gusts 4 mph7 km/h	73%	0%	0
Sun 1a	Clear	40°4° (likely 40°4° to 47°8°)	40°4°	0%	1 mph2 km/h from S, gusts 5 mph7 km/h	85%	0%	0
Sun 2a	Clear	36°2° (likely 36°2° to 46°8°)	36°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Sun 3a	Clear	35°2° (likely 35°2° to 44°7°)	35°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 4a	Clear	35°2° (likely 35°2° to 43°6°)	35°2°	0%	1 mph2 km/h from N, gusts 4 mph7 km/h	100%	0%	0
Sun 5a	Clear	35°2° (likely 35°2° to 42°6°)	35°2°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	100%	0%	0
Sun 6a	Clear	35°2° (likely 35°2° to 41°5°)	35°2°	0%	2 mph3 km/h from N, gusts 5 mph9 km/h	100%	0%	0
Sun 7a	Sunny	34°1° (likely 34°1° to 41°5°)	34°1°	0%	2 mph3 km/h from N, gusts 5 mph9 km/h	100%	0%	0
Sun 8a	Sunny	35°2° (likely 35°2° to 41°5°)	35°2°	0%	2 mph3 km/h from N, gusts 5 mph9 km/h	100%	0%	0
Sun 9a	Sunny	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	86%	0%	1
Sun 10a	Sunny	52°11° (likely 51°11° to 53°12°)	52°11°	0%	1 mph2 km/h from N, gusts 3 mph5 km/h	69%	0%	2
Sun 11a	Sunny	57°14° (likely 55°13° to 59°15°)	57°14°	0%	1 mph2 km/h from NW, gusts 2 mph4 km/h	57%	0%	3
Sun 12p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	51%	1%	4
Sun 1p	Sunny	62°17° (likely 59°15° to 63°17°)	62°17°	0%	1 mph2 km/h from W, gusts 5 mph7 km/h	48%	1%	4
Sun 2p	Sunny	63°17° (likely 60°16° to 64°18°)	63°17°	0%	1 mph2 km/h from SW, gusts 4 mph6 km/h	46%	1%	4
Sun 3p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	46%	2%	4
Sun 4p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	1 mph2 km/h from S, gusts 5 mph7 km/h	46%	1%	2
Sun 5p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 5 mph8 km/h	48%	0%	1
Sun 6p	Clear	57°14° (likely 56°13° to 59°15°)	57°14°	0%	0 mph0 km/h, gusts 5 mph8 km/h	59%	0%	0
Sun 7p	Clear	52°11° (likely 52°11° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 5 mph8 km/h	69%	0%	0
Sun 8p	Clear	45°7° (likely 45°7° to 52°11°)	45°7°	0%	0 mph0 km/h, gusts 4 mph7 km/h	93%	0%	0
Sun 9p	Clear	42°6° (likely 42°6° to 52°11°)	42°6°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	0%	0
Sun 10p	Clear	41°5° (likely 41°5° to 51°11°)	41°5°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Sun 11p	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 12a	Clear	38°3° (likely 38°3° to 48°9°)	38°3°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Mon 1a	Clear	38°3° (likely 38°3° to 47°8°)	38°3°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	0%	0
Mon 2a	Clear	37°3° (likely 37°3° to 47°8°)	37°3°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	100%	0%	0
Mon 3a	Clear	37°3° (likely 37°3° to 46°8°)	37°3°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	100%	0%	0
Mon 4a	Clear	37°3° (likely 37°3° to 45°7°)	37°3°	0%	1 mph2 km/h from NW, gusts 5 mph8 km/h	100%	1%	0
Mon 5a	Clear	37°3° (likely 37°3° to 45°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	100%	6%	0
Mon 6a	Clear	37°3° (likely 37°3° to 44°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 6 mph9 km/h	100%	11%	0
Mon 7a	Sunny	37°3° (likely 37°3° to 44°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	100%	13%	0
Mon 8a	Sunny	37°3° (likely 37°3° to 45°7°)	37°3°	0%	2 mph3 km/h from NW, gusts 5 mph9 km/h	100%	16%	0
Mon 9a	Sunny	44°7° (likely 44°7° to 49°9°)	44°7°	0%	2 mph3 km/h from NW, gusts 5 mph8 km/h	100%	16%	1
Mon 10a	Sunny	52°11° (likely 52°11° to 55°13°)	52°11°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	86%	0%	2
Mon 11a	Sunny	57°14° (likely 56°13° to 60°16°)	57°14°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	72%	0%	3
Mon 12p	Sunny	62°17° (likely 60°16° to 64°18°)	62°17°	0%	3 mph5 km/h from NW, gusts 9 mph15 km/h	60%	5%	4
Mon 1p	Sunny	65°18° (likely 62°17° to 67°19°)	65°18°	0%	5 mph8 km/h from NW, gusts 11 mph17 km/h	54%	6%	4
Mon 2p	Sunny	67°19° (likely 65°18° to 68°20°)	67°19°	0%	5 mph8 km/h from NW, gusts 12 mph19 km/h	50%	0%	4
Mon 3p	Sunny	67°19° (likely 66°19° to 68°20°)	67°19°	0%	5 mph8 km/h from NW, gusts 12 mph19 km/h	50%	0%	4
Mon 4p	Sunny	68°20° (likely 67°19° to 68°20°)	68°20°	0%	5 mph8 km/h from NW, gusts 11 mph18 km/h	51%	0%	3
Mon 5p	Sunny	67°19° (likely 65°18° to 67°19°)	67°19°	0%	3 mph5 km/h from NW, gusts 10 mph16 km/h	54%	0%	1
Mon 6p	Clear	62°17° (likely 61°16° to 63°17°)	62°17°	0%	2 mph3 km/h from NW, gusts 6 mph10 km/h	65%	0%	0
Mon 7p	Clear	57°14° (likely 57°14° to 59°15°)	57°14°	0%	2 mph3 km/h from W, gusts 4 mph7 km/h	77%	1%	0
Mon 8p	Clear	53°12° (likely 53°12° to 56°13°)	53°12°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	86%	3%	0
Mon 9p	Clear	51°11° (likely 51°11° to 54°12°)	51°11°	0%	2 mph3 km/h from NW, gusts 4 mph6 km/h	89%	0%	0
Mon 10p	Clear	51°11° (likely 51°11° to 54°12°)	51°11°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	89%	0%	0
Mon 11p	Clear	50°10° (likely 48°9° to 54°12°)	49°9°	0%	3 mph5 km/h from NW, gusts 5 mph8 km/h	96%	0%	0

Days ahead

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

Today, Oct 25. Sunny. High 64°18°, low 34°1°. Typical 64°18° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 35°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 37°3°
  Dry
Official NWS forecast
Today: Areas of frost before 9am. Sunny, with a high near 64. Northwest wind around 2 mph.
Tonight: Areas of frost between 1am and 2am, then areas of frost and patchy fog. Clear, with a low around 34. North wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
34°1°–41°5°
Typical high / low
64°18° / 43°6°
Wind
7 mph10 km/h
UV peak
4
Tomorrow, Oct 26. Sunny. High 68°20°, low 48°9°. Typical 63°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 68. Northwest wind around 5 mph.
Night: Clear, with a low around 48. Northwest wind 2 to 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–69°21°
Low, likely
40°4°–48°9°
Typical high / low
63°17° / 42°6°
Wind
8 mph13 km/h, gusts 18 mph28 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 42°6°. Typical 63°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 44°6°
  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°–67°19°
Low, likely
42°6°–50°10°
Typical high / low
63°17° / 42°6°
Wind
11 mph18 km/h, gusts 23 mph36 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 63°17°, low 46°8°. Typical 62°17° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63.
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
41°5°–47°8°
Typical high / low
62°17° / 42°6°
Wind
7 mph11 km/h, gusts 17 mph27 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 67°19°, low 49°9°. Typical 62°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 67.
Night: Mostly clear, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–67°19°
Low, likely
46°8°–50°10°
Typical high / low
62°17° / 42°6°
Wind
9 mph15 km/h, gusts 27 mph44 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 72°22°, low 49°9°. Typical 62°17° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 72.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
72°22°–76°24°
Low, likely
47°8°–52°11°
Typical high / low
62°17° / 41°5°
Wind
7 mph11 km/h, gusts 18 mph29 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 69°21°, low 50°10°. Typical 61°16° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 69.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–69°21°
Low, likely
47°8°–52°11°
Typical high / low
61°16° / 41°5°
Wind
11 mph17 km/h, gusts 19 mph30 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 68°20°, low 52°11°. Typical 61°16° / 40°4°. Rain 0.03 in0.8 mm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 62°17°
  20% chance · 0.04 in1 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.13 in3.4 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°–72°22°
Low, likely
46°8°–56°13°
Typical high / low
61°16° / 40°4°
Wind
11 mph18 km/h, gusts 29 mph46 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 70°21°, low 60°16°. Typical 60°16° / 40°4°. Rain 0.27 in6.9 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 62°17°
  30% chance · 0.11 in2.9 mm
2. Afternoon
  noon–6 PM
  Drizzle, 70°21°
  20% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Cloudy, 64°18°
  20% chance · 0.01 in0.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 57°14°
  20% chance · 0.08 in2 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
68°20°–75°24°
Low, likely
57°14°–67°19°
Typical high / low
60°16° / 40°4°
Wind
17 mph28 km/h, gusts 38 mph61 km/h
UV peak
3
Tuesday, Nov 3. Cloudy. High 69°21°, low 54°12°. Typical 60°16° / 40°4°. Rain 0.15 in3.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 57°14°
  20% chance · 0.08 in2 mm
2. Afternoon
  noon–6 PM
  Partly sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  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
65°18°–74°23°
Low, likely
47°8°–58°14°
Typical high / low
60°16° / 40°4°
Wind
18 mph29 km/h, gusts 33 mph54 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 64°, low 34°.
Tomorrow
Dry, high 68°, low 48°, warming up.
Tuesday
Dry, high 66°, low 42°.
Rest of week
Mostly dry, highs 63–72°.

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)

5.1 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

Deer Creek (MD) near Darlington

5.0 mi

Below flood stage

Level: 1.2 ft
Flow: 71 cfs

Reading from Sat 11:15 PM · NWS gauge page

Susquehanna River at Conowingo Dam

5.2 mi

Below flood stage

Level: 10.9 ft
Flow: 13,100 cfs

Reading from Sat 11:35 PM · NWS gauge page

Swan Creek at Swan Creek

6.5 mi

Below flood stage

Level: 2.9 ft

Reading from Sat 11:15 PM · NWS gauge page

For your home

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

Heating this week

About 64% less heating than a typical week.

This week 32Typical 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 37°F).

Open the windows?

Today, 12:00 PM–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 about typical for the date.

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

Port Deposit 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 24 min less
Golden hour: 5:33–6:28 PM; Morning 7:08–8:02 AM
Blue hour: 6:28–6:38 PM; Morning 6:57–7:08 AM; first light 6:57 AM

Stars tonight? Fair

Clear 12:36–6:57 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

99% lit · growing

Today: sets 6:47 AM · rises 5:36 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from Port Deposit. The highest point on the skyline is about 5,200 ft, 10 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

Port Deposit, 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)

Deer Creek (MD) near Darlington

Susquehanna River at Conowingo Dam

Swan Creek at Swan Creek

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