Jefferson County, Pennsylvania, United States

Last updated: 4:15 PM CDT  ·  Refresh
19°C
Feels like 20°
Partly Cloudy
▲ 21°  /  ▼ 11°
Wind
5 mph NE
Humidity
86%
Dew Point
17°
Pressure
28.41 inHg
Visibility
10 mi
UV Index
5.3
Cloud Cover
58%
Sunrise
6:30 AM
Sunset
8:07 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Jefferson County is currently partly cloudy at 19°C. Dry conditions are expected through the next 24 hours. Sunrise: 6:30AM · Sunset: 8:07PM.

Alerts

No active alerts for this location.
29 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
19°
28%
6 PM
21°
41%
7 PM
21°
26%
8 PM
19°
34%
9 PM
19°
34%
10 PM
16°
24%
11 PM
16°
24%
12 AM
15°
24%
1 AM
14°
28%
2 AM
14°
15%
3 AM
13°
15%
4 AM
12°
15%
5 AM
12°
15%
6 AM
11°
15%
7 AM
12°
16%
8 AM
13°
16%
9 AM
14°
16%
10 AM
16°
7%
11 AM
17°
9%
12 PM
19°
9%
1 PM
20°
9%
2 PM
22°
9%
3 PM
22°
9%
4 PM
22°
9%
7-Day Forecast
Today
21° 11°
Partly Cloudy with a 34% chance of rain.
Fri
25° 11°
Fog.
Sat
26° 15°
Mostly Cloudy with a 56% chance of rain.
Sun
22° 12°
Rain, 68% chance.
Mon
22° 10°
Drizzle, 42% chance.
Tue
24° 10°
Drizzle, 52% chance.
Wed
24° 13°
Drizzle, 53% chance.
TimeTempConditionsPrecipWindHumidity
Now 19° Partly Cloudy 28% 5 mph NE 86%
6 PM 21° Partly Cloudy 41% 4 mph NE 86%
7 PM 21° Mostly Clear 26% 4 mph ENE 88%
8 PM 19° Mostly Clear 34% 3 mph ENE 91%
9 PM 19° Mostly Clear 34% 4 mph ENE 93%
10 PM 16° Clear 24% 4 mph ENE 95%
11 PM 16° Clear 24% 3 mph ENE 97%
12 AM 15° Mostly Clear 24% 3 mph ENE 96%
1 AM 14° Mostly Clear 28% 3 mph ENE 96%
2 AM 14° Partly Cloudy 15% 3 mph ENE 96%
3 AM 13° Partly Cloudy 15% 3 mph ENE 96%
4 AM 12° Partly Cloudy 15% 3 mph NE 96%
5 AM 12° Fog 15% 3 mph NE 97%
6 AM 11° Fog 15% 3 mph NE 96%
7 AM 12° Fog 16% 3 mph ENE 94%
8 AM 13° Fog 16% 4 mph ENE 90%
9 AM 14° Fog 16% 5 mph ENE 82%
10 AM 16° Fog 7% 5 mph E 75%
11 AM 17° Haze 9% 5 mph E 70%
12 PM 19° Mostly Clear 9% 5 mph E 63%
1 PM 20° Mostly Clear 9% 5 mph E 56%
2 PM 22° Clear 9% 6 mph E 51%
3 PM 22° Clear 9% 5 mph E 52%
4 PM 22° Clear 9% 5 mph E 53%
15-Day Forecast
Today
8/20
Partly Cloudy
34%
11°
21°
Fri
8/21
Fog
16%
11°
25°
Sat
8/22
Mostly Cloudy
56%
15°
26°
Sun
8/23
Rain
68%
12°
22°
Mon
8/24
Drizzle
42%
10°
22°
Tue
8/25
Drizzle
52%
10°
24°
Wed
8/26
Drizzle
53%
13°
24°
Thu
8/27
Rain
63%
14°
25°
Fri
8/28
Drizzle
44%
14°
27°
Sat
8/29
Drizzle
51%
15°
28°
Sun
8/30
Drizzle
60%
16°
27°
Mon
8/31
Drizzle
60%
16°
27°
Tue
9/1
Drizzle
60%
15°
26°
Wed
9/2
Drizzle
60%
14°
27°
Thu
9/3
Drizzle
60%
13°
26°
29
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
29 AQI 5.2 µg/m³
O3
Ground-level ozone
28 AQI 30 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 29 Good 28 29
Sat 32 Good 32 22
Sun 48 Good 42 48
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 Thu Aug 20, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE87 J/kg
MLCAPE32 J/kg
MUCAPE87 J/kg
SBCIN-7 J/kg
MLCIN-0 J/kg
Lifted Index0.2
Kinematics
0–6 km Shear23 kt
0–1 km Shear8 kt
Eff. Shear—
0–1 km SRH-26
0–3 km SRH5
Eff. SRH—
Storm Motion341° @ 23 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index29.2
Thermo & Levels
PWAT1.29 in
0–3 km LR5.5 °C/km
700–500 LR5.3 °C/km
Total Totals41.8
LCL930 hPa
LFC910 hPa
EL471 hPa
Freezing Lvl12,133 ft