Ossian, Indiana Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Ossian weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°55°—
- FridayJun 5Overcast43%—86°63°+1°
- SaturdayJun 6Light Showers74%—81°64°-5°
- SundayJun 7Drizzle41%—84°67°+3°
- MondayJun 8Light Showers19%—80°65°-4°
- TuesdayJun 9Drizzle22%—80°66°0°
- WednesdayJun 10Drizzle27%0.02″80°69°0°
PM2.5 at 6.5 µg/m³ (AQI 36) with a 0.89 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 19 over the last 6 hours — air quality is improving sharply.
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 6.5 µg/m³ (AQI 36) with a 0.89 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.89
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:12 AM
- Moonset
- 1:39 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Ossian at a glance
- Today vs. normal: 16°F below the seasonal normal for this latitude
- Last frost: April 21 (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 — Ossian
SPC has placed Ossian in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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
Ossian's warmest month is July (~74°F mean) and its coldest is January (~26°F). Rainfall peaks in May (4.6 inches) and bottoms out in February (2.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 26° | 2.5″ | 6 |
| February | 29° | 2.1″ | 5 |
| March | 39° | 2.8″ | 6 |
| April | 50° | 3.7″ | 8 |
| May | 61° | 4.6″ | 8 |
| June | 71° | 4.5″ | 8 |
| July | 74° | 4.0″ | 7 |
| August | 72° | 3.8″ | 6 |
| September | 65° | 3.0″ | 6 |
| October | 53° | 3.0″ | 6 |
| November | 41° | 3.0″ | 6 |
| December | 31° | 2.5″ | 6 |
Regional context
Ossian sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Indianapolis, IN, Evansville, IN, Lafayette, IN, Bloomington, IN, Fishers, IN.
Frequently asked
- When does it freeze in Ossian?
- Ossian's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Ossian?
- May is the wettest month with about 4.6 inches of rain on average; the city receives roughly 39 inches annually.
- What is the warmest month in Ossian?
- July is typically warmest, averaging about 74°F.
- What is the coldest month in Ossian?
- January is typically coldest, averaging about 26°F.
- When can I start a vegetable garden in Ossian?
- 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 Ossian get?
- Ossian averages about 77 rainy days per year.
- What hardiness zone is Ossian?
- Ossian'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
Ossian, Indiana sits in a humid subtropical climate zone. January means hover near 26°F while July averages 74°F — a 48°F seasonal swing.
Across the year, Ossian receives about 39 inches of precipitation spread over roughly 77 rainy days.
The rhythm of the year is set by latitude (40.9°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.