Frost Advisory
Ends in 49 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 6:47 AM EDT at KFDK

Mount Airy, MD weather

Clear and 32°0°.

Forecasts agree

Now 32°0°

Clear

Wind: Calm; Light through 8 PM
Dew point: 32°0°; Dry, static shocks likely
Humidity: 100%; Air 32°0°, dew point 32°0° · frost likely
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 7Good; Ozone · tomorrow moderate
Pressure: 30.54 inHg1034 hPa; Rising slowly · +0.03 inHg+1.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 50°10° today by 11 AM
High 61°16° today at 3 PM
Below 50°10° tonight after 7 PM

This morningUp to 54°12° by 11 AM · Clear
This afternoonUp to 61°16° by 3 PM · Clear
TonightDown to 36°2° by 4 AM · Clear
Tomorrow morningUp to 55°13° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 2 PM · Clear
Tomorrow nightDown to 40°4° by 5 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 8a	Sunny	36°2° (likely 36°2° to 41°5°)	36°2°	0%	1 mph2 km/h from NE, gusts 3 mph5 km/h	100%	21%	0
Sat 9a	Sunny	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from NE, gusts 3 mph6 km/h	85%	14%	1
Sat 10a	Sunny	47°8° (likely 47°8° to 51°11°)	47°8°	0%	1 mph2 km/h from E, gusts 3 mph5 km/h	71%	0%	2
Sat 11a	Sunny	54°12° (likely 53°12° to 55°13°)	54°12°	0%	2 mph3 km/h from E, gusts 9 mph15 km/h	57%	0%	3
Sat 12p	Sunny	56°13° (likely 55°13° to 57°14°)	56°13°	0%	3 mph5 km/h from SE, gusts 11 mph18 km/h	53%	0%	4
Sat 1p	Sunny	59°15° (likely 57°14° to 59°15°)	59°15°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	45%	1%	4
Sat 2p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from SE, gusts 9 mph14 km/h	44%	2%	4
Sat 3p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	42%	3%	4
Sat 4p	Sunny	60°16° (likely 58°14° to 60°16°)	60°16°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	44%	3%	3
Sat 5p	Sunny	60°16° (likely 57°14° to 60°16°)	60°16°	0%	2 mph3 km/h from E, gusts 7 mph12 km/h	46%	4%	1
Sat 6p	Clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	2 mph3 km/h from E, gusts 7 mph12 km/h	55%	5%	0
Sat 7p	Clear	49°9° (likely 48°9° to 51°11°)	49°9°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	68%	3%	0
Sat 8p	Clear	47°8° (likely 46°8° to 49°9°)	47°8°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	71%	0%	0
Sat 9p	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	1 mph2 km/h from E, gusts 7 mph10 km/h	79%	0%	0
Sat 10p	Clear	42°6° (likely 42°6° to 47°8°)	42°6°	0%	1 mph2 km/h from E, gusts 6 mph9 km/h	82%	0%	0
Sat 11p	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	89%	0%	0
Sun 12a	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	85%	1%	0
Sun 1a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 5 mph8 km/h	92%	3%	0
Sun 2a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	1%	0
Sun 3a	Clear	37°3° (likely 37°3° to 44°7°)	37°3°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	6%	0
Sun 4a	Clear	36°2° (likely 36°2° to 43°6°)	36°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Sun 5a	Clear	36°2° (likely 36°2° to 42°6°)	36°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	1%	0
Sun 6a	Clear	36°2° (likely 36°2° to 41°5°)	36°2°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	2%	0
Sun 7a	Sunny	35°2° (likely 35°2° to 41°5°)	35°2°	0%	0 mph0 km/h, gusts 5 mph7 km/h	100%	1%	0
Sun 8a	Sunny	36°2° (likely 36°2° to 42°6°)	36°2°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	1%	0
Sun 9a	Sunny	43°6° (likely 42°6° to 46°8°)	43°6°	0%	1 mph2 km/h from NE, gusts 4 mph7 km/h	89%	1%	1
Sun 10a	Sunny	50°10° (likely 50°10° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 4 mph7 km/h	74%	6%	2
Sun 11a	Sunny	55°13° (likely 54°12° to 57°14°)	55°13°	0%	0 mph0 km/h, gusts 4 mph7 km/h	64%	5%	3
Sun 12p	Sunny	58°14° (likely 56°13° to 60°16°)	58°14°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	57%	10%	4
Sun 1p	Sunny	61°16° (likely 57°14° to 61°16°)	61°16°	0%	1 mph2 km/h from SW, gusts 6 mph10 km/h	51%	27%	4
Sun 2p	Sunny	63°17° (likely 57°14° to 63°17°)	63°17°	0%	1 mph2 km/h from SW, gusts 7 mph11 km/h	48%	31%	4
Sun 3p	Sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	1 mph2 km/h from SW, gusts 7 mph12 km/h	48%	15%	4
Sun 4p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 7 mph12 km/h	48%	7%	3
Sun 5p	Sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	0 mph0 km/h, gusts 6 mph10 km/h	46%	3%	1
Sun 6p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	0 mph0 km/h, gusts 5 mph7 km/h	55%	3%	0
Sun 7p	Clear	53°12° (likely 52°11° to 55°13°)	53°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	69%	2%	0
Sun 8p	Clear	50°10° (likely 49°9° to 52°11°)	50°10°	0%	0 mph0 km/h, gusts 3 mph5 km/h	80%	2%	0
Sun 9p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	0 mph0 km/h, gusts 4 mph6 km/h	83%	0%	0
Sun 10p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	0 mph0 km/h, gusts 5 mph8 km/h	89%	0%	0
Sun 11p	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 5 mph8 km/h	93%	0%	0
Mon 12a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 5 mph8 km/h	96%	0%	0
Mon 1a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	96%	0%	0
Mon 2a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	96%	0%	0
Mon 3a	Clear	42°6° (likely 42°6° to 45°7°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	96%	0%	0
Mon 4a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	2 mph3 km/h from W, gusts 3 mph5 km/h	100%	1%	0
Mon 5a	Clear	40°4° (likely 40°4° to 43°6°)	40°4°	0%	2 mph3 km/h from W, gusts 3 mph5 km/h	100%	14%	0
Mon 6a	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	2 mph3 km/h from W, gusts 3 mph5 km/h	100%	17%	0
Mon 7a	Sunny	38°3° (likely 38°3° to 42°6°)	38°3°	0%	2 mph3 km/h from W, gusts 3 mph6 km/h	100%	18%	0

Days ahead

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

Today, Oct 24. Fog. High 61°16°, low 35°2°. Typical 62°17° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  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 61. East wind around 3 mph.
Tonight: Patchy fog between 2am and 3am, then patchy frost and patchy fog. Clear, with a low around 35. East wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
58°14°–61°16°
Low, likely
35°2°–40°4°
Typical high / low
62°17° / 44°7°
Wind
8 mph13 km/h, gusts 14 mph23 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 63°17°, low 38°3°. Typical 61°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Day: Patchy frost and patchy fog before 9am. Sunny, with a high near 63. Southwest wind around 1 mph.
Night: Clear, with a low around 38. West wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–63°17°
Low, likely
38°3°–41°5°
Typical high / low
61°16° / 43°6°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 67°19°, low 47°8°. Typical 61°16° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  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: Sunny, with a high near 67. West wind around 5 mph.
Night: Mostly clear, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–67°19°
Low, likely
39°4°–47°8°
Typical high / low
61°16° / 43°6°
Wind
9 mph14 km/h, gusts 15 mph24 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 63°17°, low 43°6°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 63.
Night: Mostly clear, with a low around 43.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
43°6°–48°9°
Typical high / low
60°16° / 42°6°
Wind
11 mph18 km/h, gusts 21 mph33 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 62°17°, low 46°8°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 62.
Night: Mostly cloudy, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–63°17°
Low, likely
41°5°–46°8°
Typical high / low
60°16° / 42°6°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 67°19°, low 49°9°. Typical 60°16° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  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: Mostly sunny, with a high near 67.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–67°19°
Low, likely
44°7°–49°9°
Typical high / low
60°16° / 42°6°
Wind
7 mph12 km/h, gusts 24 mph38 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 69°21°, low 48°9°. Typical 60°16° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: 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
69°21°–73°23°
Low, likely
46°8°–49°9°
Typical high / low
60°16° / 41°5°
Wind
12 mph20 km/h, gusts 29 mph47 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 68°20°, low 47°8°. Typical 59°15° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°9°
  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
58°14°–74°23°
Low, likely
40°4°–53°12°
Typical high / low
59°15° / 41°5°
Wind
12 mph19 km/h, gusts 29 mph47 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 66°19°, low 49°9°. Typical 59°15° / 41°5°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 56°13°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  20% chance
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
54°12°–71°22°
Low, likely
38°3°–53°12°
Typical high / low
59°15° / 41°5°
Wind
10 mph16 km/h, gusts 22 mph36 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 66°19°, low 52°11°. Typical 58°14° / 40°4°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  20% chance
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
53°12°–73°23°
Low, likely
41°5°–57°14°
Typical high / low
58°14° / 40°4°
Wind
10 mph16 km/h, gusts 18 mph29 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 35°.
Tomorrow
Dry, high 63°, low 38°.
Monday
Dry, high 67°, low 47°, warming up.
Rest of week
Mostly dry, highs 62–69°.

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

12 mi

Below flood stage

Level: 1.7 ft
Flow: 173 cfs

Forecast peak 1.7 ft Sat 8 AM

Reading from Sat 6:30 AM · NWS gauge page

CATTAIL CREEK NEAR GLENWOOD, MD

9.9 mi

Level: 0.6 ft
Flow: 5 cfs

Reading from Sat 5:45 AM · NWS gauge page

Soper Branch at Hyattstown, MD

11 mi

Below flood stage

Level: 0.4 ft
Flow: under 1 cfs

Reading from Sat 5:55 AM · NWS gauge page

Patuxent River near Unity

11 mi

Below flood stage

Level: 2.1 ft
Flow: 14 cfs

Reading from Sat 5:55 AM · NWS gauge page

For your home

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

Heating this week

About 65% less heating than a typical week.

This week 33Typical 95

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

Comfort

Dry air outside (dew point 32°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Damascus 3 Ssw · official normals 1991–2020 · records 1993–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

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

−8°−4°SunOct 18
−3°−2°MonOct 19
+1°TueOct 20
−1°WedOct 21
+1°ThuOct 22
—FriOct 23
—SatOct 24

Mount Airy 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? Fair

Clear 6:44 PM–7:01 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

96% lit · growing

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

Looking west from Mount Airy. The highest point on the skyline is about 2,500 ft, 31 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

Mount Airy, 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

CATTAIL CREEK NEAR GLENWOOD, MD

Soper Branch at Hyattstown, MD

Patuxent River near Unity

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