Frost Advisory
Starts in 9 h 53 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 2:50 PM EDT at KHGR

Lewistown, MD weather

Sunny and 61°16°, jacket by 7 PM.

Forecasts agree

Now 61°16°

Sunny

Wind: 6 mph9 km/h; From the south-southeast. Up to 6 mph9 km/h through 3 AM
Dew point: 30°−1°; Dry · up to 39°4° by 5 PM (comfortable)
UV index: 4Moderate; Moderate until 5 PM
Air quality: 32Good; Ozone · tomorrow moderate
Pressure: 30.51 inHg1033 hPa; Falling · −0.06 inHg−2.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 62°17° today at 5 PM
Below 50°10° tonight after 9 PM
Low 37°3° tomorrow at 6 AM
Above 50°10° tomorrow by 11 AM
Fog Monday 7–9 AM

This afternoonNear 61°16° · Clear
TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 54°12° by 11 AM · Clear
Tomorrow afternoonUp to 64°18° by 3 PM · Clear
Tomorrow nightDown to 40°4° by 5 AM · Clear
Monday morningUp to 57°14° by 11 AM · Partly cloudy
Monday afternoonUp to 68°20° by 2 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 3p	Sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	44%	2%	4
Sat 4p	Sunny	61°16° (likely 59°15° to 62°17°)	61°16°	0%	3 mph5 km/h from SE, gusts 6 mph9 km/h	42%	4%	3
Sat 5p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	43%	5%	1
Sat 6p	Clear	59°15° (likely 54°12° to 59°15°)	59°15°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	47%	1%	0
Sat 7p	Clear	55°13° (likely 50°10° to 55°13°)	55°13°	0%	1 mph2 km/h from E, gusts 6 mph9 km/h	55%	4%	0
Sat 8p	Clear	51°11° (likely 47°8° to 51°11°)	51°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	63%	5%	0
Sat 9p	Clear	47°8° (likely 44°7° to 49°9°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	74%	0%	0
Sat 10p	Clear	45°7° (likely 42°6° to 48°9°)	45°7°	0%	0 mph0 km/h, gusts 3 mph5 km/h	79%	0%	0
Sat 11p	Clear	43°6° (likely 40°4° to 48°9°)	43°6°	0%	0 mph0 km/h, gusts 3 mph6 km/h	86%	0%	0
Sun 12a	Clear	42°6° (likely 39°4° to 47°8°)	42°6°	0%	0 mph0 km/h, gusts 2 mph3 km/h	86%	0%	0
Sun 1a	Clear	41°5° (likely 39°4° to 45°7°)	41°5°	0%	0 mph0 km/h, gusts 2 mph2 km/h	89%	9%	0
Sun 2a	Clear	40°4° (likely 38°3° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 2 mph3 km/h	92%	10%	0
Sun 3a	Clear	39°4° (likely 37°3° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 2 mph4 km/h	96%	14%	0
Sun 4a	Clear	39°4° (likely 36°2° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 2 mph4 km/h	96%	12%	0
Sun 5a	Clear	38°3° (likely 35°2° to 42°6°)	38°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	14%	0
Sun 6a	Clear	37°3° (likely 34°1° to 42°6°)	37°3°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	13%	0
Sun 7a	Clear	37°3° (likely 34°1° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	14%	0
Sun 8a	Sunny	37°3° (likely 33°1° to 41°5°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	13%	0
Sun 9a	Sunny	42°6° (likely 38°3° to 46°8°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	13%	1
Sun 10a	Sunny	49°9° (likely 47°8° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 3 mph4 km/h	74%	3%	2
Sun 11a	Sunny	54°12° (likely 53°12° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 4 mph7 km/h	66%	3%	3
Sun 12p	Sunny	56°13° (likely 56°13° to 59°15°)	56°13°	0%	0 mph0 km/h, gusts 6 mph10 km/h	64%	2%	4
Sun 1p	Sunny	60°16° (likely 60°16° to 61°16°)	60°16°	0%	1 mph2 km/h from S, gusts 8 mph12 km/h	55%	2%	4
Sun 2p	Sunny	62°17° (likely 61°16° to 63°17°)	62°17°	0%	2 mph3 km/h from S, gusts 8 mph13 km/h	52%	2%	4
Sun 3p	Sunny	64°18° (likely 62°17° to 64°18°)	64°18°	0%	2 mph3 km/h from S, gusts 8 mph13 km/h	48%	2%	4
Sun 4p	Sunny	64°18° (likely 62°17° to 64°18°)	64°18°	0%	2 mph3 km/h from S, gusts 8 mph13 km/h	48%	2%	3
Sun 5p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	1 mph2 km/h from S, gusts 7 mph12 km/h	50%	1%	1
Sun 6p	Clear	60°16° (likely 57°14° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 7 mph10 km/h	55%	0%	0
Sun 7p	Clear	57°14° (likely 52°11° to 57°14°)	57°14°	0%	0 mph0 km/h, gusts 5 mph7 km/h	62%	0%	0
Sun 8p	Clear	51°11° (likely 49°9° to 53°12°)	51°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	74%	0%	0
Sun 9p	Clear	49°9° (likely 47°8° to 52°11°)	49°9°	0%	0 mph0 km/h, gusts 2 mph4 km/h	80%	0%	0
Sun 10p	Clear	47°8° (likely 45°7° to 51°11°)	47°8°	0%	0 mph0 km/h, gusts 2 mph4 km/h	83%	0%	0
Sun 11p	Clear	46°8° (likely 44°7° to 50°10°)	46°8°	0%	0 mph0 km/h, gusts 2 mph3 km/h	86%	0%	0
Mon 12a	Clear	45°7° (likely 42°6° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 2 mph3 km/h	89%	9%	0
Mon 1a	Clear	44°7° (likely 41°5° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 2 mph3 km/h	93%	15%	0
Mon 2a	Clear	42°6° (likely 40°4° to 47°8°)	42°6°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	12%	0
Mon 3a	Clear	42°6° (likely 40°4° to 48°9°)	42°6°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	13%	0
Mon 4a	Clear	41°5° (likely 39°4° to 47°8°)	41°5°	0%	0 mph0 km/h, gusts 3 mph5 km/h	96%	19%	0
Mon 5a	Mostly clear	40°4° (likely 38°3° to 47°8°)	40°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	29%	0
Mon 6a	Mostly clear	39°4° (likely 36°2° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	42%	0
Mon 7a	Fog	38°3° (likely 36°2° to 43°6°)	38°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	50%	0
Mon 8a	Fog	39°4° (likely 36°2° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	45%	0
Mon 9a	Sunny	44°7° (likely 41°5° to 50°10°)	44°7°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	89%	26%	1
Mon 10a	Sunny	50°10° (likely 48°9° to 55°13°)	50°10°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	77%	12%	2
Mon 11a	Sunny	57°14° (likely 56°13° to 60°16°)	57°14°	0%	1 mph2 km/h from W, gusts 7 mph11 km/h	64%	3%	3
Mon 12p	Sunny	62°17° (likely 62°17° to 64°18°)	62°17°	0%	2 mph3 km/h from W, gusts 9 mph14 km/h	56%	0%	4
Mon 1p	Sunny	65°18° (likely 65°18° to 66°19°)	65°18°	0%	2 mph3 km/h from NW, gusts 9 mph15 km/h	52%	0%	4
Mon 2p	Sunny	68°20° (likely 66°19° to 68°20°)	68°20°	0%	3 mph5 km/h from NW, gusts 10 mph16 km/h	47%	2%	4

Days ahead

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

Today, Oct 24. Sunny. High 62°17°, low 37°3°. Typical 63°17° / 40°4°. Dry. Forecasts agree.
1. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
2. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 62. Southeast wind around 3 mph.
Tonight: Patchy fog between 3am and 4am, then areas of frost and patchy fog. Clear, with a low around 37. South wind 0 to 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
32°0°–39°4°
Typical high / low
63°17° / 40°4°
Wind
7 mph11 km/h, gusts 15 mph24 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 64°18°, low 38°3°. Typical 63°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 37°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Day: Areas of frost and patchy fog before 9am. Sunny, with a high near 64. Southeast wind around 2 mph.
Night: Mostly clear, with a low around 38. Wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–64°18°
Low, likely
33°1°–41°5°
Typical high / low
63°17° / 40°4°
Wind
7 mph11 km/h, gusts 12 mph20 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 49°9°. Typical 62°17° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  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, 49°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 70. West wind 0 to 3 mph.
Night: Mostly clear, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
36°2°–49°9°
Typical high / low
62°17° / 40°4°
Wind
8 mph13 km/h, gusts 15 mph23 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 67°19°, low 45°7°. Typical 62°17° / 39°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 67.
Night: Partly cloudy, with a low around 45.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–67°19°
Low, likely
44°7°–50°10°
Typical high / low
62°17° / 39°4°
Wind
7 mph12 km/h, gusts 17 mph27 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 64°18°, low 48°9°. Typical 62°17° / 39°4°. Dry. Forecasts 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°12°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 46°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 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–64°18°
Low, likely
38°3°–48°9°
Typical high / low
62°17° / 39°4°
Wind
9 mph14 km/h, gusts 16 mph26 km/h
UV peak
4
Thursday, Oct 29. Cloudy. High 71°22°, low 51°11°. Typical 61°16° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  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 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–71°22°
Low, likely
42°6°–51°11°
Typical high / low
61°16° / 39°4°
Wind
7 mph12 km/h, gusts 21 mph34 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 74°23°, low 53°12°. Typical 61°16° / 38°3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  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, 51°10°
  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 53.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–75°24°
Low, likely
44°7°–53°12°
Typical high / low
61°16° / 38°3°
Wind
8 mph13 km/h, gusts 21 mph33 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 71°22°, low 51°11°. Typical 60°16° / 38°3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 54°12°
  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
67°19°–75°24°
Low, likely
48°9°–55°13°
Typical high / low
60°16° / 38°3°
Wind
6 mph10 km/h, gusts 22 mph36 km/h
UV peak
4
Sunday, Nov 1. Drizzle. High 68°20°, low 53°12°. Typical 60°16° / 38°3°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  30% chance
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  30% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 61°16°
  30% chance · 0.07 in1.8 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
61°16°–72°22°
Low, likely
49°9°–55°13°
Typical high / low
60°16° / 38°3°
Wind
9 mph14 km/h, gusts 20 mph32 km/h
UV peak
1
Monday, Nov 2. Showers. High 70°21°, low 58°14°. Typical 60°16° / 37°3°. Rain 0.85 in22 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  30% chance · 0.06 in1.5 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°21°
  20% chance · 0.12 in3.1 mm
3. Evening
  6 PM–midnight
  Drizzle, 64°18°
  30% chance · 0.79 in20 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
62°17°–76°24°
Low, likely
52°11°–65°18°
Typical high / low
60°16° / 37°3°
Wind
17 mph28 km/h, gusts 35 mph56 km/h

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 37°.
Tomorrow
Dry, high 64°, low 38°.
Monday
Dry, high 70°, low 49°, warming up.
Rest of week
Mostly dry, highs 64–74°.

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

Monocacy River near Frederick at Interstate 70

9.9 mi

Below flood stage

Level: 1.7 ft
Flow: 171 cfs

Forecast peak 1.7 ft Sat 8 PM

Reading from Sat 1:30 PM · NWS gauge page

Antietam Creek near Sharpsburg

18 mi

Below flood stage

Level: 2.4 ft
Flow: 103 cfs

Forecast peak 2.3 ft Sat 8 PM

Reading from Sat 1:15 PM · NWS gauge page

Monocacy River at Monocacy Blvd. in Frederick

7.0 mi

Below flood stage

Level: 1.6 ft
Flow: 119 cfs

Reading from Sat 1:15 PM · NWS gauge page

Catoctin Creek Near Middletown

11 mi

Below flood stage

Level: 1.6 ft
Flow: 9 cfs

Reading from Sat 1:45 PM · NWS gauge page

For your home

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

Heating this week

About 69% less heating than a typical week.

This week 31Typical 101

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 25
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 17 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F).

Open the windows?

Today, 4:00 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
−8°−4°FriOct 23
—SatOct 24

Lewistown 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 7:12–8:06 AM
Blue hour: 6:34–6:45 PM; Morning 7:01–7:12 AM; first light 7:01 AM

Stars tonight? Fair

Clear 6:45 PM–7:02 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:41 AM · rises 5:14 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Lewistown. The highest point on the skyline is about 1,700 ft, 5 mi away.Skyline from USGS elevation data, heights drawn up to 4.5× taller. Sky, sun and moon as they are now.

1 active weather alert

Frost Advisory

Lewistown, 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

Antietam Creek near Sharpsburg

Monocacy River at Monocacy Blvd. in Frederick

Catoctin Creek Near Middletown

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