Climate Comfort Score
63/100
Good
NOAA 1991–2020 normals 53°F annual avg Public-domain federal data
Castleton, IN Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 53°F
- Avg annual temp
- 63/100
- Comfort score
- 47.2"
- Annual precip
- 191d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Castleton
Castleton, Indiana averages 53°F a year and scores 63/100 on the comfort index - good, milder than 47% of U.S. cities.
- 53°F
- average temperature, NOAA 1991-2020 normal
- 63/100
- comfort score, milder than 47% of U.S. cities
- 47.2"
- annual precipitation · 27" snow
- 191 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
53°F (12°C)
Avg High
62°F
Avg Low
43°F
Annual Precip
47.2"
Annual Snow
26.7"
Comfort Score
63/100
Good
Avg Annual Temperature
53°F
30-year mean (NOAA NCEI)
Annual Precipitation
47.2"
Plus 26.7" of snow
Comfort score vs national 100-point ceiling (Castleton) 63.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Castleton area.
How Castleton compares to every U.S. city
Castleton's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 Top 53% higher than 47% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Castleton
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Castleton captures average conditions across the spread shown, the most recent decade is warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
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 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 3.3"
Snow: 8.4"
12.4 days with precipitation
February 2.7"
Snow: 7.2"
11.4 days with precipitation
March 3.9"
Snow: 3.6"
11.9 days with precipitation
April 4.6"
Snow: 0.2"
11.8 days with precipitation
May 4.9"
14.1 days with precipitation
June 5.6"
11.8 days with precipitation
July 4.7"
10.2 days with precipitation
August 3.9"
9.3 days with precipitation
September 3.6"
8.1 days with precipitation
October 3.4"
10.2 days with precipitation
November 3.5"
Snow: 0.6"
9.8 days with precipitation
December 3.2"
Snow: 6.7"
13.3 days with precipitation
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
What Castleton's climate means for you
Castleton runs 53°F a year - peaking in July, coldest in January.
- Gardeners get about 191 frost-free days, with the last spring freeze near April 18 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,428 heating and 999 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Castleton, IN
Castleton, Indiana runs an annual average of 53°F, ranging from a mean daily high of 62°F to a mean daily low of 43°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00121326, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Castleton receives roughly 47.2 inches of precipitation each year, with 26.7 inches typically falling as snow. The frost-free season averages 191 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 18 and the first fall freeze near October 26. For energy use, 5,428 heating degree days and 999 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Castleton scores 63/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for July-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Castleton, IN? ▼
The average annual temperature in Castleton, Indiana is 53°F. The warmest month averages 85°F (29°C) and the coldest averages 20°F (-7°C).
How much rain does Castleton get? ▼
Castleton receives 47.2 inches of precipitation annually, including 26.7 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Castleton? ▼
Castleton has a climate comfort score of 63/100 (Good), milder than 47% of U.S. cities in the PlainClimate database.
When is the growing season in Castleton? ▼
Castleton has approximately 191 frost-free days per year, with the last spring freeze around April 18 and the first fall freeze around October 26.
How much energy does heating and cooling require in Castleton? ▼
Castleton has 5,428 heating degree days and 999 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Castleton climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00121326 near Castleton.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00121326. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.