Clarks Summit, Pennsylvania Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Clarks Summit weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——83°49°—
- FridayJun 5Overcast——85°60°+2°
- SaturdayJun 6Showers58%0.02″81°65°-4°
- SundayJun 7Heavy Drizzle58%—74°55°-7°
- MondayJun 8Overcast——76°51°+2°
- TuesdayJun 9Overcast——82°49°+6°
- WednesdayJun 10Partly Cloudy13%—84°53°+2°
Ozone at AQI 96 — peak already passed at 1 PM under partly cloudy skies. AQI up 44 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 96 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 96
- UV peak
- 3.8 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 96
PM × Wind × Precip
PM2.5 at 4.6 µg/m³, PM10 at 4.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 1.00
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:36 AM
- Moonset
- 12:58 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Clarks Summit at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 25 (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.
SPC Convective Outlook
Storm Prediction Center — Clarks Summit
SPC has placed Clarks Summit in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- 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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Clarks Summit's warmest month is July (~74°F mean) and its coldest is January (~28°F). Rainfall peaks in September (4.2 inches) and bottoms out in February (2.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 28° | 2.6″ | 6 |
| February | 30° | 2.1″ | 6 |
| March | 38° | 2.8″ | 7 |
| April | 50° | 3.3″ | 7 |
| May | 61° | 3.3″ | 8 |
| June | 69° | 3.8″ | 8 |
| July | 74° | 3.6″ | 7 |
| August | 72° | 3.9″ | 7 |
| September | 65° | 4.2″ | 6 |
| October | 53° | 3.7″ | 6 |
| November | 43° | 2.9″ | 6 |
| December | 33° | 2.8″ | 6 |
Regional context
Clarks Summit sits within a warm-summer humid continental climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Philadelphia, PA, Pittsburgh, PA, Allentown, PA, Harrisburg, PA, Lancaster, PA.
Frequently asked
- When does it freeze in Clarks Summit?
- Clarks Summit's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Clarks Summit?
- September is the wettest month with about 4.2 inches of rain on average; the city receives roughly 39 inches annually.
- What is the warmest month in Clarks Summit?
- July is typically warmest, averaging about 74°F.
- What is the coldest month in Clarks Summit?
- January is typically coldest, averaging about 28°F.
- When can I start a vegetable garden in Clarks Summit?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Clarks Summit get?
- Clarks Summit averages about 80 rainy days per year.
- What hardiness zone is Clarks Summit?
- Clarks Summit's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Clarks Summit, Pennsylvania sits in a warm-summer humid continental climate zone. January means hover near 28°F while July averages 74°F — a 46°F seasonal swing.
Across the year, Clarks Summit receives about 39 inches of precipitation spread over roughly 80 rainy days.
The rhythm of the year is set by latitude (41.5°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.