Frederick County, Virginia, United States

Last updated: 10:31 PM CDT · Refresh

20°C

Feels like 21°

Mostly Cloudy

▲ 28° / ▼ 19°

Wind

8 mph SSW

Humidity

92%

Dew Point

18°

Pressure

28.81 inHg

Visibility

10 mi

UV Index

0.0

Cloud Cover

70%

Sunrise

6:04 AM

Sunset

8:34 PM

Drag to pan · double-click to forecast a point

WeatherAI™ Analysis

WeatherAI Analysis: Frederick County is currently mostly cloudy at 20°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 727 J/kg) — isolated convective development possible. Sunrise: 6:04AM · Sunset: 8:34PM.

56 AQI · Moderate Dominant: PM2.5 Air Quality

Hourly Forecast · Next 24 Hours

Now

20°

30%

12 AM

21°

37%

1 AM

20°

22%

2 AM

20°

3 AM

20°

13%

4 AM

20°

30%

5 AM

19°

25%

6 AM

19°

13%

7 AM

21°

13%

8 AM

22°

13%

9 AM

23°

13%

10 AM

23°

17%

11 AM

24°

12 PM

25°

1 PM

26°

2 PM

27°

3 PM

27°

4 PM

26°

5 PM

27°

6 PM

25°

7 PM

24°

8 PM

23°

9 PM

22°

10 PM

21°

7-Day Forecast

Tonight

28° 19°

Mostly Cloudy with a 30% chance of rain.

Wed

27° 17°

Mostly Clear with a 25% chance of rain.

Thu

27° 14°

Clear.

Fri

27° 13°

Partly Cloudy.

Sat

26° 17°

Mostly Cloudy.

Sun

32° 16°

Rain, 70% chance.

Mon

33° 19°

Rain, 71% chance.

+ Feels like

TimeTempConditionsPrecipWindHumidity

Now 20° Mostly Cloudy 30% 8 mph SSW 92%

12 AM 21° Mostly Cloudy 37% 8 mph SSW 92%

1 AM 20° Mostly Cloudy 22% 6 mph SSW 92%

2 AM 20° Partly Cloudy 9% 6 mph SSW 92%

3 AM 20° Partly Cloudy 13% 6 mph SW 92%

4 AM 20° Mostly Clear 30% 5 mph SW 92%

5 AM 19° Mostly Clear 25% 5 mph WSW 91%

6 AM 19° Mostly Clear 13% 5 mph WSW 89%

7 AM 21° Mostly Clear 13% 6 mph W 86%

8 AM 22° Mostly Clear 13% 7 mph W 80%

9 AM 23° Mostly Clear 13% 9 mph W 72%

10 AM 23° Mostly Clear 17% 10 mph W 64%

11 AM 24° Mostly Clear 8% 11 mph W 57%

12 PM 25° Mostly Clear 6% 11 mph W 54%

1 PM 26° Mostly Clear 6% 11 mph W 51%

2 PM 27° Mostly Clear 3% 11 mph W 49%

3 PM 27° Mostly Clear 3% 11 mph WNW 49%

4 PM 26° Clear 3% 11 mph WNW 49%

5 PM 27° Mostly Clear 3% 11 mph WNW 51%

6 PM 25° Mostly Clear 3% 9 mph WNW 54%

7 PM 24° Partly Cloudy 3% 8 mph WNW 58%

8 PM 23° Partly Cloudy 3% 8 mph NW 60%

9 PM 22° Partly Cloudy 3% 7 mph NW 63%

10 PM 21° Partly Cloudy 3% 7 mph NW 65%

15-Day Forecast

Today

7/21

Mostly Cloudy

30%

19°

28°

Wed

7/22

Mostly Clear

25%

17°

27°

Thu

7/23

Clear

14°

27°

Fri

7/24

Partly Cloudy

19%

13°

27°

Sat

7/25

Mostly Cloudy

15%

17°

26°

Sun

7/26

Rain

70%

16°

32°

Mon

7/27

Rain

71%

19°

33°

Tue

7/28

Rain

63%

17°

36°

Wed

7/29

Drizzle

43%

16°

31°

Thu

7/30

Drizzle

44%

15°

30°

Fri

7/31

Drizzle

60%

15°

30°

Sat

8/1

Drizzle

60%

16°

29°

Sun

8/2

Drizzle

60%

16°

31°

Mon

8/3

Drizzle

60%

17°

32°

Tue

8/4

Drizzle

60%

18°

33°

Moderate

U.S. Air Quality Index · Dominant: PM2.5

50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today

PM_2.5

Fine particulate matter

Dominant

56 AQI 11.6 µg/m³

O₃

Ground-level ozone

31 AQI 33 ppb

3-Day Outlook

DayAQICategoryO₃PM2.5

Today 56 Moderate 31 56

Thu 36 Good 36 36

Fri 43 Good 36 43

About the Air Quality Index

0–50 Good

51–100 Moderate

101–150 Unhealthy for Sensitive Groups

151–200 Unhealthy

201–300 Very Unhealthy

301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM_2.5 (fine particles) is reported in µg/m³ and ozone (O₃) in ppb. Forecast source: NWS NAQFC.

Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio

RAP

Valid Wed Jul 22, 02:00'Z' · F0 · 130 (13 km CONUS/NA)

Hodograph · kt

0–1 1–3 3–6 6–9 km

Instability

SBCAPE0 J/kg

MLCAPE65 J/kg

MUCAPE143 J/kg

SBCIN-6220 J/kg

MLCIN0 J/kg

Lifted Index1.2

Kinematics

0–6 km Shear40 kt

0–1 km Shear32 kt

Eff. Shear11 kt

0–1 km SRH-45

0–3 km SRH-22

Eff. SRH12

Storm Motion237° @ 37 kt

0–1 km EHI-0.0

Composite Parameters

Sig. Tornado-0.0

STP (eff)0.0

Supercell0.0

K-Index36.9

Thermo & Levels

PWAT1.72 in

0–3 km LR4.3 °C/km

700–500 LR5.9 °C/km

Total Totals47.2

LCL951 hPa

LFC—

EL—

Freezing Lvl13,661 ft

Frederick County, Virginia, United States

Alerts