Frederick County, Maryland, United States

Last updated: 9:09 PM CDT  ·  Refresh
19°C
Feels like 19°
Mostly Cloudy
▲ 29°  /  ▼ 15°
Wind
9 mph N
Humidity
87%
Dew Point
17°
Pressure
29.62 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
61%
Sunrise
6:27 AM
Sunset
7:58 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Frederick County is currently mostly cloudy at 19°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:27AM · Sunset: 7:58PM.

Alerts

No active alerts for this location.
43 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
19°
3%
11 PM
18°
21%
12 AM
18°
21%
1 AM
17°
14%
2 AM
17°
3%
3 AM
17°
3%
4 AM
17°
6%
5 AM
16°
15%
6 AM
15°
15%
7 AM
15°
15%
8 AM
16°
15%
9 AM
18°
15%
10 AM
19°
3%
11 AM
21°
5%
12 PM
22°
5%
1 PM
23°
5%
2 PM
26°
8%
3 PM
26°
5%
4 PM
26°
5%
5 PM
26°
5%
6 PM
24°
5%
7 PM
23°
5%
8 PM
23°
18%
9 PM
22°
36%
7-Day Forecast
Tonight
29° 15°
Mostly Cloudy.
Fri
26° 15°
Partly Cloudy with a 36% chance of rain.
Sat
23° 17°
Rain, 90% chance.
Sun
29° 16°
Partly Cloudy with a 42% chance of rain.
Mon
28° 14°
Clear.
Tue
29° 14°
Rain, 61% chance.
Wed
29° 17°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 19° Mostly Cloudy 3% 9 mph N 87%
11 PM 18° Partly Cloudy 21% 9 mph N 89%
12 AM 18° Partly Cloudy 21% 8 mph N 91%
1 AM 17° Partly Cloudy 14% 6 mph N 92%
2 AM 17° Partly Cloudy 3% 5 mph N 93%
3 AM 17° Partly Cloudy 3% 5 mph N 92%
4 AM 17° Partly Cloudy 6% 4 mph N 92%
5 AM 16° Partly Cloudy 15% 5 mph NNW 93%
6 AM 15° Partly Cloudy 15% 6 mph N 91%
7 AM 15° Mostly Cloudy 15% 6 mph N 89%
8 AM 16° Mostly Cloudy 15% 6 mph N 86%
9 AM 18° Mostly Cloudy 15% 8 mph NNE 80%
10 AM 19° Partly Cloudy 3% 8 mph NNE 74%
11 AM 21° Partly Cloudy 5% 7 mph NNE 68%
12 PM 22° Partly Cloudy 5% 6 mph NNE 62%
1 PM 23° Partly Cloudy 5% 6 mph NNE 56%
2 PM 26° Mostly Clear 8% 5 mph NE 51%
3 PM 26° Mostly Clear 5% 5 mph NE 51%
4 PM 26° Mostly Clear 5% 4 mph NE 51%
5 PM 26° Mostly Clear 5% 4 mph NE 52%
6 PM 24° Mostly Clear 5% 4 mph NE 56%
7 PM 23° Mostly Clear 5% 4 mph NE 61%
8 PM 23° Mostly Clear 18% 4 mph NE 65%
9 PM 22° Partly Cloudy 36% 4 mph NE 67%
15-Day Forecast
Today
8/20
Mostly Cloudy
3%
15°
29°
Fri
8/21
Partly Cloudy
36%
15°
26°
Sat
8/22
Rain
90%
17°
23°
Sun
8/23
Partly Cloudy
42%
16°
29°
Mon
8/24
Clear
8%
14°
28°
Tue
8/25
Rain
61%
14°
29°
Wed
8/26
Rain
82%
17°
29°
Thu
8/27
Rain
82%
18°
28°
Fri
8/28
Rain
68%
18°
31°
Sat
8/29
Rain
68%
18°
31°
Sun
8/30
Drizzle
60%
18°
31°
Mon
8/31
Drizzle
60%
17°
31°
Tue
9/1
Drizzle
60%
16°
29°
Wed
9/2
Drizzle
60%
16°
29°
Thu
9/3
Drizzle
60%
16°
28°
43
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
43 AQI 7.7 µg/m³
O3
Ground-level ozone
42 AQI 45 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 43 Good 42 43
Sat 36 Good 33 36
Sun 33 Good 33 26
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. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Thu Aug 20, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE5 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index5.2
Kinematics
0–6 km Shear34 kt
0–1 km Shear15 kt
Eff. Shear—
0–1 km SRH-77
0–3 km SRH17
Eff. SRH—
Storm Motion317° @ 29 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index28.8
Thermo & Levels
PWAT1.60 in
0–3 km LR3.9 °C/km
700–500 LR5.6 °C/km
Total Totals41.0
LCL964 hPa
LFC—
EL—
Freezing Lvl14,767 ft