Photo: Huw Williams (Huwmanbeing) · Public domainNo extremes in Rob Roy: its weather tracks the middle of U.S. towns
Expect July afternoons of about 84°. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 67° apart. Winter nights are cold: in January they are colder than in 71% of U.S. towns. Radiators earn their keep from November to March, the months that average under 50°.
A year in Rob Roy at a glance
Each month’s typical high and low, and what it brings.
What stands out about Rob Roy’s climate
Compared with towns across the U.S., with Rob Roy’s place in Indiana beside it.
What a year in Rob Roy feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 176 frost-free days a year
In half of years the last 32° night comes by April 22 and the first by October 17. Frost and day counts come from NOAA’s station at Attica 2e, IN, 4 miles from the town’s center, 110 ft higher.
The 2023 USDA map puts Rob Roy’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −9°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 23 inches of snow a winter
Snow, measured at Attica 2e, IN, falls mostly in January. Precipitation (rain plus melted snow) adds up to 40 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 110 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Rob Roy
87% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Attica 2e, IN.
Living with Rob Roy’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
176 frost-free days in zone 6a. The last frost comes by Apr 22 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 17.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Rob Roy from natural hazards, river flooding is the largest share (37%); heat waves, cold waves, winter storms and ice storms together are 25%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Rob Roy and similar climates
TownRatings has no climate map of the towns around Rob Roy yet.
Climates most like Rob Roy’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Rob Roy, IN | 18° | 84° | 40" | 23" |
| Marysville, OH | 20° | 84° | 40" | 24" |
| New Castle, PA | 20° | 84° | 42" | 28" |
| Claverack, NY | 16° | 84° | 42" | 31" |
| Galesburg, IL | 15° | 84° | 39" | 26" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Rob Roy averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.1°).
A smaller shift than in 81% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Rob Roy compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Rob Roy’s place among Indiana’s.
Rob Roy weather by month
Highs, lows and precipitation from NOAA’s grid at Rob Roy’s center; snow, wet days and snow on the ground from Attica 2e, IN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 18° | 2.5" | 8.1" | 9 | 12 | 18° – 39° |
| February | 39° | 21° | 2.0" | 5.7" | 8 | 8 | 17° – 40° |
| March | 50° | 30° | 2.8" | 3.1" | 9 | 3 | 33° – 55° |
| April | 63° | 40° | 4.2" | 0.2" | 11 | 0 | 44° – 57° |
| May | 74° | 51° | 4.5" | 0.0" | 12 | 0 | 56° – 70° |
| June | 82° | 60° | 4.9" | 0.0" | 11 | 0 | 67° – 75° |
| July | 84° | 63° | 4.4" | 0.0" | 9 | 0 | 68° – 80° |
| August | 83° | 61° | 3.5" | 0.0" | 8 | 0 | 67° – 78° |
| September | 78° | 53° | 2.9" | 0.0" | 7 | 0 | 60° – 70° |
| October | 66° | 43° | 3.2" | 0.0" | 8 | 0 | 50° – 60° |
| November | 51° | 32° | 3.1" | 0.7" | 9 | 1 | 34° – 50° |
| December | 39° | 23° | 2.5" | 5.5" | 9 | 8 | 17° – 41° |
| Year | 62° | 41° | 40.4" | 23.3" | 110 | 31 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 17° to 41°. June is the most reliable, staying within 8°.
Where Rob Roy’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Rob Roy’s center.
- Snow: Attica 2e, IN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Attica 2e, IN, 4 miles from the town’s center, 110 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Rob Roy’s climate
What is the weather like in Rob Roy?
A typical July afternoon reaches 84°, a January night drops to 18°, and about 23 inches of snow falls in a normal winter. Colder January nights than 71% of U.S. towns; cooler July afternoons than 56% of U.S. towns.
How cold does it get in Rob Roy in winter?
January nights average 18°. About 129 nights a year reach 32° or below and 8 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How much snow does Rob Roy get?
About 23 inches in a normal winter at Attica 2e, IN, most of it in January, with snow on the ground about 31 days a year.
How hot does it get in Rob Roy?
July, with a typical high of 84° and a low of 63°. About 16 days a year reach 90° (Attica 2e, IN).
When is the first and last frost in Rob Roy?
In half of years the last spring frost (32°) comes by April 22 and the first fall frost by October 17, about 176 frost-free days, at Attica 2e, IN.
What growing zone is Rob Roy in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −9°.
What is the best time of year to visit Rob Roy?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Rob Roy getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 81% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Rob Roy.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.