Frost Advisory
Ends in 4 h 26 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 3:55 AM EDT at KDMW

New Windsor, MD weather

Clear and 41°5°.

Forecasts agree

Now 41°5°

Clear

Wind: Calm; Light through 4 PM
Dew point: 39°4°; Comfortable
Humidity: 93%; Air 41°5°, dew point 39°4° · fog or dew likely
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 8Good; Ozone · tomorrow moderate
Pressure: 30.48 inHg1032 hPa; Rising slowly · +0.02 inHg+0.6 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

11°6° cooler than this time yesterday (52°11° then, 41°5° now)

Good hours for

Low 35°2° today at 6 AM
Above 50°10° today by 10 AM
High 62°17° today at 2 PM
Below 50°10° tonight after 8 PM

TonightNear 38°3° · Clear
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 64°18° by 2 PM · Clear
Tomorrow nightDown to 39°4° by 2 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 4a	Clear	38°3° (likely 38°3° to 42°6°)	38°3°	0%	1 mph2 km/h from NW, gusts 3 mph5 km/h	100%	4%	0
Sat 5a	Clear	37°3° (likely 37°3° to 42°6°)	37°3°	0%	1 mph2 km/h from NW, gusts 4 mph6 km/h	100%	1%	0
Sat 6a	Clear	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	14%	0
Sat 7a	Sunny	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 3 mph6 km/h	100%	15%	0
Sat 8a	Sunny	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	14%	0
Sat 9a	Sunny	42°6° (likely 41°5° to 45°7°)	42°6°	0%	0 mph0 km/h, gusts 3 mph5 km/h	86%	13%	1
Sat 10a	Sunny	50°10° (likely 50°10° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 5 mph8 km/h	66%	0%	2
Sat 11a	Sunny	55°13° (likely 54°12° to 57°14°)	55°13°	0%	1 mph2 km/h from E, gusts 8 mph13 km/h	55%	0%	3
Sat 12p	Sunny	58°14° (likely 56°13° to 59°15°)	58°14°	0%	1 mph2 km/h from SE, gusts 8 mph13 km/h	49%	0%	4
Sat 1p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	1 mph2 km/h from SE, gusts 8 mph12 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 7 mph11 km/h	39%	0%	4
Sat 3p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	41%	1%	4
Sat 4p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	41%	1%	3
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	42%	1%	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%	1%	0
Sat 7p	Clear	50°10° (likely 49°9° to 52°11°)	50°10°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	66%	0%	0
Sat 8p	Clear	47°8° (likely 46°8° to 50°10°)	47°8°	0%	1 mph2 km/h from SE, gusts 7 mph12 km/h	74%	0%	0
Sat 9p	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	1 mph2 km/h from SE, gusts 8 mph13 km/h	82%	0%	0
Sat 10p	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 7 mph11 km/h	89%	0%	0
Sat 11p	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	89%	1%	0
Sun 12a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 6 mph10 km/h	92%	1%	0
Sun 1a	Clear	38°3° (likely 38°3° to 45°7°)	38°3°	0%	0 mph0 km/h, gusts 6 mph9 km/h	96%	4%	0
Sun 2a	Clear	36°2° (likely 36°2° to 44°7°)	36°2°	0%	0 mph0 km/h, gusts 6 mph10 km/h	100%	4%	0
Sun 3a	Clear	35°2° (likely 35°2° to 44°7°)	35°2°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	2%	0
Sun 4a	Clear	35°2° (likely 35°2° to 43°6°)	35°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	1%	0
Sun 5a	Clear	34°1° (likely 34°1° to 43°6°)	34°1°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Sun 6a	Clear	34°1° (likely 34°1° to 42°6°)	34°1°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	2%	0
Sun 7a	Sunny	33°1° (likely 33°1° to 41°5°)	33°1°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	1%	0
Sun 8a	Sunny	34°1° (likely 34°1° to 41°5°)	34°1°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	1%	0
Sun 9a	Sunny	42°6° (likely 41°5° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 2 mph3 km/h	89%	0%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 53°12°)	50°10°	0%	0 mph0 km/h, gusts 3 mph4 km/h	74%	2%	2
Sun 11a	Sunny	56°13° (likely 56°13° to 58°14°)	56°13°	0%	0 mph0 km/h, gusts 3 mph6 km/h	62%	4%	3
Sun 12p	Sunny	59°15° (likely 58°14° to 61°16°)	59°15°	0%	0 mph0 km/h, gusts 6 mph10 km/h	57%	10%	4
Sun 1p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	52%	29%	4
Sun 2p	Sunny	64°18° (likely 59°15° to 64°18°)	64°18°	0%	2 mph3 km/h from SW, gusts 7 mph11 km/h	48%	36%	4
Sun 3p	Sunny	64°18° (likely 59°15° to 64°18°)	64°18°	0%	1 mph2 km/h from SW, gusts 7 mph12 km/h	48%	21%	4
Sun 4p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	1 mph2 km/h from S, gusts 7 mph11 km/h	48%	10%	3
Sun 5p	Sunny	64°18° (likely 61°16° to 64°18°)	64°18°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	46%	13%	1
Sun 6p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	0 mph0 km/h, gusts 5 mph8 km/h	55%	10%	0
Sun 7p	Clear	54°12° (likely 53°12° to 55°13°)	54°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	69%	4%	0
Sun 8p	Clear	49°9° (likely 49°9° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 3 mph5 km/h	83%	2%	0
Sun 9p	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	89%	0%	0
Sun 10p	Clear	44°7° (likely 44°7° to 49°9°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	93%	0%	0
Sun 11p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	96%	1%	0
Mon 12a	Clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	2%	0
Mon 1a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	0%	0
Mon 2a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	0%	0
Mon 3a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0

Days ahead

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

Today, Oct 24. Sunny. High 62°17°, low 35°2°. Typical 63°17° / 40°4°. 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, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Official NWS forecast
Today: Areas of frost and patchy fog before 9am. Sunny, with a high near 62. East wind around 2 mph.
Tonight: Areas of frost. Mostly clear, with a low around 35. Northwest wind around 1 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–62°17°
Low, likely
35°2°–40°4°
Typical high / low
63°17° / 40°4°
Wind
7 mph12 km/h, gusts 12 mph20 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 35°2°. Typical 63°17° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°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 64. Southwest wind around 2 mph.
Night: Patchy frost after 5am. Clear, with a low around 35. Wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–64°18°
Low, likely
35°2°–41°5°
Typical high / low
63°17° / 40°4°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 69°21°, low 45°7°. Typical 62°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°20°
  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: Patchy frost before 9am. Sunny, with a high near 69.
Night: Mostly clear, with a low around 45.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–69°21°
Low, likely
38°3°–45°7°
Typical high / low
62°17° / 40°4°
Wind
9 mph15 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 64°18°, low 40°4°. Typical 62°17° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  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 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–67°19°
Low, likely
40°4°–50°10°
Typical high / low
62°17° / 39°4°
Wind
13 mph21 km/h, gusts 27 mph43 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 63°17°, low 44°7°. Typical 62°17° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 51°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 63.
Night: Mostly cloudy, with a low around 44.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
58°14°–63°17°
Low, likely
36°2°–45°7°
Typical high / low
62°17° / 39°4°
Wind
8 mph12 km/h, gusts 17 mph28 km/h
UV peak
3
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, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  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 69.
Night: Mostly clear, with a low around 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–69°21°
Low, likely
42°6°–48°9°
Typical high / low
61°16° / 39°4°
Wind
9 mph14 km/h, gusts 24 mph39 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 71°22°, low 46°8°. Typical 61°16° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 71.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
67°19°–73°23°
Low, likely
43°6°–49°9°
Typical high / low
61°16° / 38°3°
Wind
9 mph15 km/h, gusts 25 mph40 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 68°20°, low 46°8°. Typical 60°16° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°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
62°17°–72°22°
Low, likely
42°6°–49°9°
Typical high / low
60°16° / 38°3°
Wind
9 mph14 km/h, gusts 24 mph38 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 67°19°, low 50°10°. Typical 60°16° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 57°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
60°16°–72°22°
Low, likely
47°8°–53°12°
Typical high / low
60°16° / 38°3°
Wind
11 mph17 km/h, gusts 23 mph37 km/h
UV peak
2
Monday, Nov 2. Cloudy. High 65°18°, low 57°14°. Typical 60°16° / 37°3°. Rain 0.23 in5.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 60°16°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  20% chance · 0.12 in3 mm
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  20% chance · 0.06 in1.4 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.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
63°17°–71°22°
Low, likely
55°13°–58°14°
Typical high / low
60°16° / 37°3°
Wind
18 mph29 km/h, gusts 36 mph58 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 35°.
Tomorrow
Dry, high 64°, low 35°.
Monday
Dry, high 69°, low 45°, warming up.
Rest of week
Mostly dry, highs 63–71°.

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

Monocacy River near Frederick at Interstate 70

17 mi

Below flood stage

Level: 1.7 ft
Flow: 176 cfs

Forecast peak 1.7 ft Sat 8 AM

Reading from Sat 2:30 AM · NWS gauge page

Cranberry Branch near Westminster

7.8 mi

Below flood stage

Level: 1.3 ft
Flow: under 1 cfs

Reading from Sat 2:30 AM · NWS gauge page

Big Pipe Creek at Bruceville

8.8 mi

Below flood stage

Level: 1.0 ft
Flow: 26 cfs

Reading from Sat 3 AM · NWS gauge page

Morgan Run near Louisville

9.9 mi

Below flood stage

Level: 1.4 ft
Flow: 9 cfs

Reading from Sat 3 AM · 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 35Typical 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 21 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 39°F).

Open the windows?

Today, 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 about typical for the date.

Last 7 days vs normal

On average 6°3° colder than normal (daily mean temperature).

−10°−6°SunOct 18
−7°−4°MonOct 19
±0°TueOct 20
−5°−3°WedOct 21
−4°−2°ThuOct 22
—FriOct 23
—SatOct 24

New Windsor 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: 5:39–6:33 PM; Morning 7:11–8:05 AM
Blue hour: 6:33–6:44 PM; Morning 7:00–7:11 AM; first light 7:00 AM

Stars tonight? Good

Clear 4:34–7 AM; moon 96% lit, sets 5:40 AM.

Moon

Waxing gibbous

96% lit · growing

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

Looking northwest from New Windsor. The highest point on the skyline is about 2,100 ft, 24 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

New Windsor, 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

Cranberry Branch near Westminster

Big Pipe Creek at Bruceville

Morgan Run near Louisville

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? Good

Moon