Chance, Maryland Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Chance weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——82°61°—
- FridayJun 5Overcast——88°65°+6°
- SaturdayJun 6Overcast11%—87°67°-1°
- SundayJun 7Overcast22%—88°69°+1°
- MondayJun 8Overcast15%—72°53°-16°
- TuesdayJun 9Mostly Clear——79°49°+7°
- WednesdayJun 10Mostly Clear10%—84°60°+5°
Ozone at AQI 500 now. AQI up 11 over the last 6 hours (gradual rise). With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 222 by mid-afternoon.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 222 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 222
PM × Wind × Precip
PM2.5 at 4.5 µg/m³ (AQI 25) with a 0.78 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.78
- Wind
- light
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:26 AM
- Moonset
- 1:09 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Chance at a glance
- Today vs. normal: 15°F below the seasonal normal for this latitude
- Last frost: April 5 (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.