Grassland Colony, South Dakota Weather
Prairie lightning bugs rise. Day 77 of spring. Read this microseason across nine climate regions →
Grassland Colony weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast13%—78°57°—
- FridayJun 5Drizzle15%0.06″80°62°+2°
- SaturdayJun 6Foggy——84°59°+4°
- SundayJun 7Overcast27%—88°66°+4°
- MondayJun 8Thunderstorm47%—86°65°-2°
- TuesdayJun 9Overcast22%—91°61°+5°
- WednesdayJun 10Thunderstorm23%—99°70°+8°
Ozone at AQI 43. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 43. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 43
- UV peak
- 6.7 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 19
PM × Wind × Precip
PM2.5/PM10 ratio 0.59 with 6 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.59
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:26 AM
- Moonset
- 2:19 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Grassland Colony at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: May 20 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Grassland Colony
SPC has placed Grassland Colony in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.