Jefferson, Pennsylvania Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Jefferson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast42%—99°75°—
- SundayJul 5Light Showers54%0.20″94°71°-5°
- MondayJul 6Light Showers86%—82°68°-12°
- TuesdayJul 7Light Showers86%—70°66°-12°
- WednesdayJul 8Light Drizzle31%0.02″72°63°+2°
- ThursdayJul 9Overcast12%—89°65°+17°
- FridayJul 10Overcast46%—88°70°-1°
AQI 76 (Moderate), driven by Ozone. AQI down 11 over the last 6 hours (gradual decline). Ozone at AQI 45. Overcast through the UV peak window (cloud cover ~72%) — 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 45. Overcast through the UV peak window (cloud cover ~72%) — afternoon ozone should stay flat.
- Present
- AQI 45
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 5
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 8.0 µg/m³, PM10 to 8.3 µg/m³.
- PM2.5/PM10
- 0.96
- Wind
- calm
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:24 PM
- Moonset
- 11:17 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Jefferson at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Jefferson
- Sat99°74°42%
- Sun94°72°54%
- Mon82°68°86%
- Tue70°66°86%
- Wed72°63°31%
- Thu89°65°12%
- Fri88°70°46%
- Sat82°63°28%
- Sun79°62°31%
- Mon82°56°16%
- Tue87°60°16%
- Wed81°64°24%
- Thu85°60°30%
- Fri88°62°36%
- Sat85°69°39%
- Sun83°68°46%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Jefferson
SPC has placed Jefferson in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.
ZIP codes in Jefferson
- 17311
- 17362