Rosemont, Maryland Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Rosemont weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——86°55°—
- FridayJun 5Overcast——91°62°+5°
- SaturdayJun 6Overcast28%—87°64°-4°
- SundayJun 7Heavy Drizzle34%—84°64°-3°
- MondayJun 8Light Drizzle——69°55°-15°
- TuesdayJun 9Overcast——79°47°+10°
- WednesdayJun 10Mostly Clear14%—82°52°+3°
PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.98 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 12 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 8.5 µg/m³ (AQI 47) with a 0.98 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.98
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:36 AM
- Moonset
- 1:12 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Rosemont at a glance
- Today vs. normal: 18°F below the seasonal normal for this latitude
- Last frost: April 12 (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.