Frederick County, Maryland, United States

Last updated: 10:25 PM CDT  ·  Refresh
19°C
Feels like 19°
Partly Cloudy
▲ 29°  /  ▼ 15°
Wind
8 mph N
Humidity
88%
Dew Point
16°
Pressure
29.64 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
41%
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 partly 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%
12 AM
18°
21%
1 AM
18°
14%
2 AM
18°
3%
3 AM
17°
3%
4 AM
17°
6%
5 AM
15°
15%
6 AM
15°
15%
7 AM
16°
15%
8 AM
17°
15%
9 AM
18°
15%
10 AM
20°
3%
11 AM
21°
5%
12 PM
22°
5%
1 PM
25°
5%
2 PM
26°
5%
3 PM
27°
5%
4 PM
27°
5%
5 PM
27°
5%
6 PM
25°
5%
7 PM
24°
5%
8 PM
23°
15%
9 PM
21°
26%
10 PM
21°
26%
7-Day Forecast
Tonight
29° 15°
Partly Cloudy.
Fri
27° 15°
Partly Cloudy with a 41% chance of rain.
Sat
23° 17°
Rain, 78% chance.
Sun
29° 16°
Mostly Clear with a 28% chance of rain.
Mon
28° 14°
Clear.
Tue
29° 14°
Rain, 61% chance.
Wed
29° 17°
Rain, 82% chance.
TimeTempConditionsPrecipWindHumidity
Now 19° Partly Cloudy 3% 8 mph N 88%
12 AM 18° Clear 21% 8 mph N 90%
1 AM 18° Clear 14% 6 mph N 92%
2 AM 18° Mostly Clear 3% 5 mph N 92%
3 AM 17° Mostly Clear 3% 4 mph N 92%
4 AM 17° Mostly Clear 6% 4 mph N 91%
5 AM 15° Mostly Clear 15% 5 mph N 92%
6 AM 15° Partly Cloudy 15% 6 mph N 90%
7 AM 16° Partly Cloudy 15% 6 mph N 88%
8 AM 17° Partly Cloudy 15% 8 mph N 83%
9 AM 18° Partly Cloudy 15% 8 mph NNE 76%
10 AM 20° Partly Cloudy 3% 8 mph NNE 69%
11 AM 21° Partly Cloudy 5% 7 mph NNE 63%
12 PM 22° Partly Cloudy 5% 6 mph NNE 59%
1 PM 25° Mostly Clear 5% 5 mph NE 54%
2 PM 26° Partly Cloudy 5% 4 mph NE 50%
3 PM 27° Partly Cloudy 5% 4 mph NE 49%
4 PM 27° Partly Cloudy 5% 4 mph NE 47%
5 PM 27° Partly Cloudy 5% 4 mph NE 49%
6 PM 25° Partly Cloudy 5% 4 mph NE 54%
7 PM 24° Partly Cloudy 5% 4 mph NE 59%
8 PM 23° Mostly Cloudy 15% 4 mph NE 64%
9 PM 21° Partly Cloudy 26% 4 mph NE 66%
10 PM 21° Partly Cloudy 26% 4 mph NE 69%
15-Day Forecast
Today
8/20
Partly Cloudy
3%
15°
29°
Fri
8/21
Partly Cloudy
41%
15°
27°
Sat
8/22
Rain
78%
17°
23°
Sun
8/23
Mostly Clear
28%
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
72%
18°
28°
Fri
8/28
Rain
69%
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%
17°
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 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Fri Aug 21, 01:00'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
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index6.4
Kinematics
0–6 km Shear22 kt
0–1 km Shear10 kt
Eff. Shear—
0–1 km SRH-27
0–3 km SRH73
Eff. SRH—
Storm Motion329° @ 24 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index23.9
Thermo & Levels
PWAT1.44 in
0–3 km LR3.7 °C/km
700–500 LR5.4 °C/km
Total Totals38.3
LCL967 hPa
LFC1004 hPa
EL1004 hPa
Freezing Lvl14,426 ft