Castleton, IN Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Castleton's primary NOAA station, CASTLETON 2 S.
The climate verdict for Castleton
Water is the standout signal in Castleton, Indiana: 47.2 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 53°F. Its climate comfort score of 63/100 (good) lands mid-pack nationally, exceeding 46% of station-mapped location scores.
- 53°F
- average temperature, NOAA 1991-2020 normal
- 63/100
- comfort score, above 46% of station-mapped location scores
- 47.2"
- annual precipitation · 27" snow
- 191 days
- frost-free days per growing season
Castleton: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00121326 · Castleton, IN 53°F mean · 47.2" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 53°F
- RANK-MID #3,568
- PHOTO-FINISH ≈ Shelbyville Sew…
- PRCP-MID 47.2"
- SWING-WIDE 47°F
- COMF-MID 63/100
- LOAD-HEAT 5,428 HDD
- STN-1 USC00121326
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Shelbyville Sewage Plt, IN (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every IN station list.
- Castleton (this station) 53°F
- Hot Spencer, IN 53°F
- Near Shelbyville Sew…, IN 53°F
- Near Columbus Wcmh, OH 53°F
- Near Spanish Fork Pw…, UT 53°F
Climate Living Index · Castleton
Castleton: 57/100 · grade C
Castleton publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Castleton, not an official NOAA rating. Rankings still use Comfort Score 63/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 116 calendar days | 67/100 · C |
| Frost-free season | 191 days/year | 58/100 · C |
| Precipitation balance | 47.2 in · 12.2 from 35 in | 57/100 · C |
| Annual temperature balance | 52.7°F · 14.8° from 67.5°F | 52/100 · D |
| Snowfall burden | 26.7 inches/year | 42/100 · D |
Castleton · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Castleton is a continental Köppen climate: Dfa
Coldest-month mean 27.8°F and warmest-month mean 74.9°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 74.9°F
- Coldest month
- 27.8°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Castleton sits across the climate record
Three NOAA fields for Castleton's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 52nd percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 26% wettest
- Castleton's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- 69th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Castleton compares across U.S. station-mapped locations
Castleton's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 46th percentile score exceeds 46% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 36°F (2°C) | 20°F (-7°C) | 28°F (-2°C) | 3.3" | 8.4" | 26.6 | 0.0 |
| February | 41°F (5°C) | 23°F (-5°C) | 32°F (0°C) | 2.7" | 7.2" | 23.1 | 0.0 |
| March | 51°F (11°C) | 32°F (0°C) | 42°F (5°C) | 3.9" | 3.6" | 17.5 | 0.0 |
| April | 64°F (18°C) | 42°F (6°C) | 53°F (12°C) | 4.6" | 0.2" | 5.1 | 0.0 |
| May | 74°F (23°C) | 52°F (11°C) | 63°F (17°C) | 4.9" | 0.0" | 0.2 | 0.7 |
| June | 82°F (28°C) | 62°F (17°C) | 72°F (22°C) | 5.6" | 0.0" | 0.0 | 3.7 |
| July | 85°F (29°C) | 65°F (18°C) | 75°F (24°C) | 4.7" | 0.0" | 0.0 | 8.8 |
| August | 83°F (28°C) | 63°F (17°C) | 73°F (23°C) | 3.9" | 0.0" | 0.0 | 3.4 |
| September | 77°F (25°C) | 56°F (13°C) | 66°F (19°C) | 3.6" | 0.0" | 0.0 | 2.5 |
| October | 65°F (18°C) | 45°F (7°C) | 55°F (13°C) | 3.4" | 0.0" | 2.2 | 0.1 |
| November | 52°F (11°C) | 34°F (1°C) | 43°F (6°C) | 3.5" | 0.6" | 15.4 | 0.0 |
| December | 40°F (4°C) | 25°F (-4°C) | 33°F (0°C) | 3.2" | 6.7" | 22.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 85°F around July 10, short of 90°F on every date, while 116 dates carry a normal low at or below freezing, the coldest 19°F near January 19.
The freezing stretch
The normal low stays at or below 32°F into March 15, then returns to freezing around November 21, covering 116 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is May 10, when 44% of years recorded at least a hundredth of an inch. The driest is September 15 at 28%. Summed across the calendar, that is about 135 wet dates a year.
The widest day
April 23 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Castleton.
Where Castleton Stands Nationally
Days and nights track unusually close together; the widest normal swing, about 23°F, is narrower than most stations record.
Castleton earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 8.4"
12.4 days with precipitation
Snow: 7.2"
11.4 days with precipitation
Snow: 3.6"
11.9 days with precipitation
Snow: 0.2"
11.8 days with precipitation
14.1 days with precipitation
11.8 days with precipitation
10.2 days with precipitation
9.3 days with precipitation
8.1 days with precipitation
10.2 days with precipitation
Snow: 0.6"
9.8 days with precipitation
Snow: 6.7"
13.3 days with precipitation
Castleton spreads its precipitation across the year
Neither half of the year dominates here: June through August take 30% of the annual total and December through February 19%, with neither reaching the 35% that would mark a distinct wet season. Castleton has no dry season to plan around, though it does carry a wide 47.1°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 5.6" and February 2.7". The three wettest months together take 32% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in Castleton, it arrives in quantity
47.2" of precipitation falls across only about 134 wet days here, averaging 0.35 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 134 a year, 37% of all days
- Average depth per wet day
- 0.35 inches
- Most wet days
- May, about 14
- Fewest wet days
- September, about 8
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Winter brings real snow to Castleton
Castleton averages 26.7 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 24 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 26.7 inches of depth.
- Days recording measurable snow: about 24 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 6% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 26
50% probability date
Last Spring Freeze
April 18
50% probability date
Growing Season
191 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,428
Higher = more heating needed
Cooling Degree Days
999
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IN closest to Castleton on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (53°F here).
- Belleville, KS 53°F · 0.0°F off
- Cambridge, OH 53°F · 0.0°F off
- Cheyenne Wells, CO 53°F · 0.0°F off
- Cubero, NM 53°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (47.2" here), excluding temperature-peer places.
- Port Jervis, NY 47.2" · 0.0" off
- Poughkeepsie, NY 47.2" · 0.0" off
- Brunswick, GA 47.2" · 0.0" off
- Livermore Falls, ME 47.2" · 0.0" off
Snow and freeze rhythm
When cold and snow define Castleton
heating led · wet · mid swing
Castleton's energy balance leans toward cold weather: 5,428 annual heating degree days against 999 for cooling. Its 47.1°F seasonal range still makes the monthly rows more useful than the annual average alone.
Castleton's frost-free season lasts about 191 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Castleton coldest normal
January
The monthly mean of 28°F (-2°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Castleton typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Castleton snow peak
January
Castleton averages 26.7 inches of snow a year, with January the snowiest month on the normals.
Questions about Castleton's climate
How much snow does Castleton get? ▼
How cold does Castleton get in winter? ▼
How much energy does heating and cooling require in Castleton? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Castleton's primary station: CASTLETON 2 S (USC00121326). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Castleton; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Castleton comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.