Forest Lake, Pennsylvania Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Forest Lake weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——80°52°—
- FridayJun 5Overcast——83°58°+3°
- SaturdayJun 6Showers66%0.06″82°58°-1°
- SundayJun 7Showers54%0.19″72°57°-10°
- MondayJun 8Light Drizzle——73°55°+1°
- TuesdayJun 9Overcast——79°50°+6°
- WednesdayJun 10Partly Cloudy16%—82°54°+3°
PM2.5 at 17.2 µg/m³ (AQI 66) with a 0.99 fine-to-coarse ratio and 2 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 17.2 µg/m³ (AQI 66) with a 0.99 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.99
- 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
- 3:38 AM
- Moonset
- 12:58 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Forest Lake at a glance
- Today vs. normal: 19°F below the seasonal normal for this latitude
- Last frost: April 27 (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 — Forest Lake
SPC has placed Forest Lake 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
Forest Lake's warmest month is July (~69°F mean) and its coldest is January (~23°F). Rainfall peaks in June (4.7 inches) and bottoms out in February (2.4 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 23° | 2.6″ | 6 |
| February | 25° | 2.4″ | 6 |
| March | 32° | 3.0″ | 7 |
| April | 45° | 3.6″ | 8 |
| May | 56° | 3.8″ | 8 |
| June | 64° | 4.7″ | 8 |
| July | 69° | 3.8″ | 8 |
| August | 67° | 4.1″ | 7 |
| September | 60° | 4.0″ | 6 |
| October | 49° | 3.8″ | 7 |
| November | 38° | 3.1″ | 7 |
| December | 28° | 3.1″ | 7 |
Frequently asked
- When does it freeze in Forest Lake?
- Forest Lake's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Forest Lake?
- June is the wettest month with about 4.7 inches of rain on average; the city receives roughly 42 inches annually.
- What is the warmest month in Forest Lake?
- July is typically warmest, averaging about 69°F.
- What is the coldest month in Forest Lake?
- January is typically coldest, averaging about 23°F.
- When can I start a vegetable garden in Forest Lake?
- 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 Forest Lake get?
- Forest Lake averages about 87 rainy days per year.
- What hardiness zone is Forest Lake?
- Forest Lake'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
Forest Lake, Pennsylvania sits in a warm-summer humid continental climate zone. January means hover near 23°F while July averages 69°F — a 46°F seasonal swing.
Across the year, Forest Lake receives about 42 inches of precipitation spread over roughly 87 rainy days.
The rhythm of the year is set by latitude (41.9°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.