Hostetter, Pennsylvania Weather
Fireflies rise from the lawn. Day 76 of spring. Read this microseason across nine climate regions →
Hostetter weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——78°46°—
- ThursdayJun 4Overcast——83°57°+5°
- FridayJun 5Overcast——79°58°-4°
- SaturdayJun 6Light Showers75%—81°62°+2°
- SundayJun 7Light Showers75%—77°63°-4°
- MondayJun 8Overcast——74°58°-3°
- TuesdayJun 9Mostly Clear——82°54°+8°
Ozone at AQI 500 now. AQI up 13 over the last 6 hours (gradual rise). With UV 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 520 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 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 520 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 7.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 520
PM × Wind × Precip
PM2.5 at 5.8 µg/m³ (AQI 32) with a 0.87 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.87
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:09 AM
- Moonset
- 12:13 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Hostetter at a glance
- Today vs. normal: 77°F — typical for the season
- Last frost: April 18 (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 3, 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.
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
Hostetter's warmest month is July (~71°F mean) and its coldest is January (~29°F). Rainfall peaks in June (4.9 inches) and bottoms out in February (2.2 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 29° | 3.3″ | 8 |
| February | 31° | 2.2″ | 6 |
| March | 39° | 3.4″ | 8 |
| April | 49° | 3.6″ | 9 |
| May | 59° | 4.3″ | 9 |
| June | 67° | 4.9″ | 9 |
| July | 71° | 4.4″ | 9 |
| August | 70° | 4.0″ | 7 |
| September | 63° | 3.5″ | 7 |
| October | 52° | 3.2″ | 6 |
| November | 42° | 3.4″ | 7 |
| December | 34° | 3.8″ | 8 |
Regional context
Hostetter's baseline climate, derived from NOAA NCEI 1991-2020 normals at the nearest reporting station, swings from a January mean of 29°F to a July mean of 71°F — a 42°F seasonal arc typical of the mid-latitude bands. Annual precipitation runs about 43.9 inches spread across roughly 92 days with measurable rain or snow each year.
Rainfall stays relatively even across the calendar: June tops out at 4.9 inches across 9.0 days with measurable rain, and February settles around 2.2 inches across 5.8 rainy days — a comparatively narrow seasonal range. That even-rainfall rhythm puts Hostetter alongside places like St. Vincent College, PA, Youngstown, PA and Lawson Heights, PA — places without a single dominant storm season, where moisture arrives steadily across the calendar.
The frost-sensitive growing window opens around mid-April, when overnight lows reliably clear freezing for cool-season crops like kale, peas, spinach, and parsnips. Heat-loving transplants like tomatoes, peppers, and squash generally hold off for another 10-14 days to clear the last spring frost risk window. The window closes around mid-November, when overnight lows resume dipping below freezing and frost-tender plants need protection or harvest. The dates above are 1991-2020 normals; in a given year either bookend can move 1-2 weeks either direction. Within Hostetter, low-lying parcels along drainage features typically lose 4-7°F of overnight low temperature versus the bench positions on calm clear nights, which shifts the working last-frost date by a week or more.
Similar climates: St. Vincent College, PA, Youngstown, PA, Lawson Heights, PA, Latrobe, PA, Loyalhanna, PA.
Frequently asked
- When does it freeze in Hostetter?
- Hostetter's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Hostetter?
- June is the wettest month with about 4.9 inches of rain on average; the city receives roughly 44 inches annually.
- What is the warmest month in Hostetter?
- July is typically warmest, averaging about 71°F.
- What is the coldest month in Hostetter?
- January is typically coldest, averaging about 29°F.
- When can I start a vegetable garden in Hostetter?
- 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 Hostetter get?
- Hostetter averages about 92 rainy days per year.
- What hardiness zone is Hostetter?
- Hostetter'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
Hostetter, Pennsylvania sits in a warm-summer humid continental climate zone. January means hover near 29°F while July averages 71°F — a 42°F seasonal swing.
Across the year, Hostetter receives about 44 inches of precipitation spread over roughly 92 rainy days.
The rhythm of the year is set by latitude (40.3°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.