Frost Advisory — Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD 9:00 AM

Day County, South Dakota, United States

Last updated: 7:39 PM CDT  ·  Refresh
42°F
Feels like 39°
Clear
▲ 49°  /  ▼ 37°
Wind
6 mph WSW
Humidity
48%
Dew Point
25°
Pressure
28.58 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
0%
Sunrise
7:46 AM
Sunset
6:43 PM
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WeatherAI™ Analysis

WeatherAI Analysis: Day County is currently clear at 42°F. Dry conditions are expected through the next 24 hours. Sunrise: 7:46AM · Sunset: 6:43PM.

Alerts

Frost Advisory
Brown, SD, Marshall, SD, Roberts, SD, Day, SD, Spink, SD, Clark, SD
Expires 9:00 AM
26 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
42°
11%
8 PM
39°
10%
9 PM
39°
3%
10 PM
38°
3%
11 PM
38°
3%
12 AM
37°
3%
1 AM
38°
3%
2 AM
38°
3%
3 AM
38°
3%
4 AM
39°
3%
5 AM
37°
3%
6 AM
37°
3%
7 AM
38°
3%
8 AM
40°
3%
9 AM
42°
3%
10 AM
45°
3%
11 AM
49°
3%
12 PM
52°
3%
1 PM
57°
3%
2 PM
60°
3%
3 PM
61°
3%
4 PM
60°
3%
5 PM
56°
3%
6 PM
55°
3%
7-Day Forecast
Tonight
49° 37°
Clear.
Sat
63° 37°
Clear.
Sun
66° 44°
Mostly Clear.
Mon
65° 43°
Clear.
Tue
68° 47°
Clear.
Wed
71° 52°
Partly Cloudy.
Thu
72° 51°
Mostly Cloudy.
TimeTempConditionsPrecipWindHumidity
Now 42° Clear 11% 6 mph WSW 48%
8 PM 39° Clear 10% 6 mph SSW 49%
9 PM 39° Clear 3% 7 mph SSW 52%
10 PM 38° Clear 3% 8 mph SSW 54%
11 PM 38° Clear 3% 10 mph SSW 56%
12 AM 37° Clear 3% 11 mph SSW 57%
1 AM 38° Clear 3% 13 mph SSW 57%
2 AM 38° Clear 3% 14 mph SSW 57%
3 AM 38° Clear 3% 15 mph SSW 57%
4 AM 39° Clear 3% 16 mph SSW 57%
5 AM 37° Clear 3% 16 mph SSW 57%
6 AM 37° Clear 3% 17 mph SSW 56%
7 AM 38° Clear 3% 17 mph SSW 55%
8 AM 40° Clear 3% 17 mph SSW 52%
9 AM 42° Clear 3% 17 mph SSW 48%
10 AM 45° Clear 3% 18 mph SSW 44%
11 AM 49° Clear 3% 18 mph SSW 38%
12 PM 52° Clear 3% 18 mph SSW 34%
1 PM 57° Clear 3% 18 mph SSW 32%
2 PM 60° Clear 3% 18 mph SSW 31%
3 PM 61° Clear 3% 18 mph SSW 30%
4 PM 60° Clear 3% 17 mph SSW 31%
5 PM 56° Clear 3% 17 mph SSW 34%
6 PM 55° Clear 3% 16 mph SSW 36%
15-Day Forecast
Today
10/16
Clear
11%
37°
49°
Sat
10/17
Clear
3%
37°
63°
Sun
10/18
Mostly Clear
3%
44°
66°
Mon
10/19
Clear
3%
43°
65°
Tue
10/20
Clear
3%
47°
68°
Wed
10/21
Partly Cloudy
7%
52°
71°
Thu
10/22
Mostly Cloudy
15%
51°
72°
Fri
10/23
Mostly Cloudy
31%
51°
70°
Sat
10/24
Drizzle
54%
38°
61°
Sun
10/25
Clear
43%
36°
50°
Mon
10/26
Drizzle
60%
37°
50°
Tue
10/27
Drizzle
60%
38°
50°
Wed
10/28
Clear
25%
39°
53°
Thu
10/29
Clear
60%
40°
53°
Fri
10/30
Clear
60%
41°
55°
26
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
8 AQI 1.4 µg/m³
O3
Ground-level ozone
Dominant
26 AQI 29 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 26 Good 26 8
Sun 28 Good 28 8
Mon 24 Good 24 23
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 Fri Oct 16, 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
MLCAPE7 J/kg
MUCAPE0 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index21.7
Kinematics
0–6 km Shear46 kt
0–1 km Shear5 kt
Eff. Shear—
0–1 km SRH41
0–3 km SRH94
Eff. SRH—
Storm Motion12° @ 26 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index-28.6
Thermo & Levels
PWAT0.28 in
0–3 km LR3.1 °C/km
700–500 LR5.0 °C/km
Total Totals4.8
LCL837 hPa
LFC—
EL—
Freezing Lvl7,205 ft