Frost Advisory — Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, Schuyler, IL, Mason, IL, Logan, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL 9:00 AM

Mason County, Illinois, United States

Last updated: 7:36 PM CDT  ·  Refresh
11°C
Feels like 6°
Partly Cloudy
▲ 13°  /  ▼ 2°
Wind
14 mph NNW
Humidity
75%
Dew Point
6°
Pressure
29.78 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
51%
Sunrise
7:10 AM
Sunset
6:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Mason County is currently partly cloudy at 10°C. Dry conditions are expected through the next 24 hours. Sunrise: 7:10AM · Sunset: 6:18PM.

Alerts

Frost Advisory
Knox, IL, Stark, IL, Peoria, IL, Marshall, IL, Woodford, IL, Fulton, IL, Tazewell, IL, Schuyler, IL, Mason, IL, Logan, IL, Cass, IL, Menard, IL, Scott, IL, Morgan, IL, Sangamon, IL, Christian, IL
Expires 9:00 AM
25 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
11°
12%
8 PM
11°
11%
9 PM
9°
4%
10 PM
9°
4%
11 PM
8°
4%
12 AM
7°
3%
1 AM
6°
3%
2 AM
5°
3%
3 AM
4°
3%
4 AM
4°
3%
5 AM
2°
3%
6 AM
2°
3%
7 AM
2°
3%
8 AM
4°
3%
9 AM
7°
3%
10 AM
8°
3%
11 AM
10°
3%
12 PM
11°
3%
1 PM
13°
3%
2 PM
15°
3%
3 PM
16°
3%
4 PM
15°
3%
5 PM
13°
3%
6 PM
12°
3%
7-Day Forecast
Tonight
13° 2°
Partly Cloudy.
Sat
16° 2°
Clear.
Sun
20° 3°
Clear.
Mon
24° 4°
Clear.
Tue
26° 8°
Mostly Clear.
Wed
27° 9°
Partly Cloudy.
Thu
28° 10°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 11° Partly Cloudy 12% 14 mph NNW 75%
8 PM 11° Mostly Clear 11% 11 mph NNW 75%
9 PM 9° Partly Cloudy 4% 11 mph NNW 76%
10 PM 9° Mostly Clear 4% 11 mph N 76%
11 PM 8° Clear 4% 11 mph N 76%
12 AM 7° Clear 3% 10 mph N 77%
1 AM 6° Clear 3% 9 mph N 78%
2 AM 5° Clear 3% 8 mph N 80%
3 AM 4° Clear 3% 7 mph N 81%
4 AM 4° Clear 3% 7 mph N 82%
5 AM 2° Clear 3% 6 mph N 84%
6 AM 2° Clear 3% 6 mph NNW 85%
7 AM 2° Clear 3% 5 mph NNW 82%
8 AM 4° Clear 3% 4 mph N 73%
9 AM 7° Clear 3% 4 mph NNE 64%
10 AM 8° Clear 3% 3 mph NE 58%
11 AM 10° Clear 3% 2 mph NE 53%
12 PM 11° Clear 3% 2 mph E 48%
1 PM 13° Clear 3% 2 mph S 43%
2 PM 15° Clear 3% 2 mph SW 40%
3 PM 16° Clear 3% 3 mph SW 38%
4 PM 15° Clear 3% 3 mph SW 38%
5 PM 13° Clear 3% 3 mph SW 40%
6 PM 12° Clear 3% 2 mph SSW 42%
15-Day Forecast
Today
10/16
Partly Cloudy
12%
2°
13°
Sat
10/17
Clear
3%
2°
16°
Sun
10/18
Clear
3%
3°
20°
Mon
10/19
Clear
3%
4°
24°
Tue
10/20
Mostly Clear
3%
8°
26°
Wed
10/21
Partly Cloudy
9%
9°
27°
Thu
10/22
Clear
9%
10°
28°
Fri
10/23
Clear
8%
12°
29°
Sat
10/24
Overcast
35%
12°
29°
Sun
10/25
Partly Cloudy
35%
9°
23°
Mon
10/26
Mostly Clear
31%
8°
22°
Tue
10/27
Drizzle
60%
8°
20°
Wed
10/28
Clear
25%
8°
21°
Thu
10/29
Drizzle
60%
8°
22°
Fri
10/30
Drizzle
60%
8°
20°
25
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
25 AQI 4.5 µg/m³
O3
Ground-level ozone
21 AQI 24 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 25 Good 21 25
Sun 28 Good 28 7
Mon 31 Good 30 31
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 Oct 16, 23:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE5 J/kg
MUCAPE20 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index9.8
Kinematics
0–6 km Shear57 kt
0–1 km Shear25 kt
Eff. Shear—
0–1 km SRH110
0–3 km SRH85
Eff. SRH—
Storm Motion21° @ 32 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index12.4
Thermo & Levels
PWAT0.55 in
0–3 km LR6.3 °C/km
700–500 LR4.6 °C/km
Total Totals37.7
LCL946 hPa
LFC1009 hPa
EL1009 hPa
Freezing Lvl4,879 ft