Big Rock, Iowa Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Big Rock weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——80°53°—
- ThursdayJun 4Heavy Rain24%0.78″85°57°+5°
- FridayJun 5Thunderstorm70%0.12″80°68°-5°
- SaturdayJun 6Heavy Showers63%0.85″84°64°+4°
- SundayJun 7Light Drizzle28%—82°66°-2°
- MondayJun 8Drizzle50%0.04″74°65°-8°
- TuesdayJun 9Drizzle34%—82°69°+8°
Ozone at AQI 83 — peak already passed at 1 PM under clear skies. AQI up 15 in the last 6 hours — air quality is degrading. Levels should ease through evening.
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 83 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 83
- UV peak
- 5.9 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 83
PM × Wind × Precip
PM2.5 at 7.4 µg/m³ (AQI 41) with a 0.83 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.83
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 4:01 AM
- Moonset
- 12:56 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Big Rock at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 27 (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 3, 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 — Big Rock
SPC has placed Big Rock in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3MRGLMarginal 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.