Mount Gretna Heights, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Mount Gretna Heights weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Rain43%0.12″100°73°—
- SundayJul 5Heavy Rain91%0.78″93°71°-7°
- MondayJul 6Light Rain91%0.17″73°62°-20°
- TuesdayJul 7Light Drizzle67%—70°58°-3°
- WednesdayJul 8Partly Cloudy12%—81°55°+11°
- ThursdayJul 9Light Drizzle32%0.01″87°62°+6°
- FridayJul 10Light Drizzle39%—83°67°-4°
AQI 57 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 11.0 µg/m³, PM10 at 11.8 µg/m³ — typical background levels with no transport signature.
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 41 now. With UV 1.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 41
- UV peak
- 1.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 11.0 µg/m³, PM10 at 11.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 10:59 PM
- Moonset
- 10:09 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Mount Gretna Heights at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 17 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Mount Gretna Heights
- Sat100°73°43%
- Sun93°71°91%
- Mon73°62°91%
- Tue70°58°67%
- Wed81°55°12%
- Thu87°62°32%
- Fri83°67°39%
- Sat83°70°33%
- Sun74°64°28%
- Mon69°63°16%
- Tue78°63°14%
- Wed84°65°24%
- Thu90°68°26%
- Fri91°72°35%
- Sat80°70°42%
- Sun83°67°44%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 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 — Mount Gretna Heights
SPC has placed Mount Gretna Heights 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 Mount Gretna Heights
- 17545
- 17064