Climate Comfort Score
64/100
Good
NOAA 1991–2020 normals 49°F annual avg Public-domain federal data
Altona, IL Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 49°F
- Avg annual temp
- 64/100
- Comfort score
- 39.4"
- Annual precip
- 167d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Altona
Altona, Illinois averages 49°F a year and scores 64/100 on the comfort index - good, milder than 51% of U.S. cities.
- 49°F
- average temperature, NOAA 1991-2020 normal
- 64/100
- comfort score, milder than 51% of U.S. cities
- 39.4"
- yearly precipitation total
- 167 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
49°F (9°C)
Avg High
60°F
Avg Low
38°F
Annual Precip
39.4"
Comfort Score
64/100
Good
Avg Annual Temperature
49°F
30-year mean (NOAA NCEI)
Annual Precipitation
39.4"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Altona) 64.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Altona area.
How Altona compares to every U.S. city
Altona's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 Top 49% higher than 51% 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 Altona
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Altona 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 30°F (-1°C) | 13°F (-11°C) | 21°F (-6°C) | 1.8" | 29.4 | 0.0 |
| February | 35°F (2°C) | 16°F (-9°C) | 26°F (-4°C) | 2.1" | 26.7 | 0.0 |
| March | 48°F (9°C) | 27°F (-3°C) | 37°F (3°C) | 2.6" | 21.9 | 0.0 |
| April | 62°F (16°C) | 37°F (3°C) | 49°F (10°C) | 4.0" | 10.7 | 0.0 |
| May | 72°F (22°C) | 49°F (10°C) | 61°F (16°C) | 5.2" | 0.6 | 0.9 |
| June | 81°F (27°C) | 59°F (15°C) | 70°F (21°C) | 4.7" | 0.0 | 3.1 |
| July | 83°F (29°C) | 62°F (17°C) | 73°F (23°C) | 4.0" | 0.0 | 6.3 |
| August | 82°F (28°C) | 59°F (15°C) | 71°F (21°C) | 3.8" | 0.0 | 3.0 |
| September | 76°F (25°C) | 52°F (11°C) | 64°F (18°C) | 3.8" | 0.2 | 2.2 |
| October | 64°F (18°C) | 40°F (4°C) | 52°F (11°C) | 2.8" | 7.3 | 0.1 |
| November | 49°F (9°C) | 28°F (-2°C) | 38°F (3°C) | 2.6" | 19.6 | 0.0 |
| December | 35°F (2°C) | 19°F (-7°C) | 27°F (-3°C) | 2.1" | 27.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 1.8"
February 2.1"
March 2.6"
April 4.0"
May 5.2"
June 4.7"
July 4.0"
August 3.8"
September 3.8"
October 2.8"
November 2.6"
December 2.1"
Frost Dates & Growing Season
First Fall Freeze
October 12
50% probability date
Last Spring Freeze
April 28
50% probability date
Growing Season
167 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,534
Higher = more heating needed
Cooling Degree Days
744
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Altona's climate means for you
Altona runs 49°F a year - peaking in July, coldest in January.
- Gardeners get about 167 frost-free days, with the last spring freeze near April 28 - plan the planting calendar around it, not the regional average.
- Energy bills track 6,534 heating and 744 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: Altona, IL
In Altona, Illinois, the NOAA 1991–2020 climate normals put the annual average temperature at 49°F, ranging from a mean daily high of 60°F to a mean daily low of 38°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00110140, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Altona receives roughly 39.4 inches of precipitation each year, predominantly as rainfall. The frost-free season averages 167 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 28 and the first fall freeze near October 12. For energy use, 6,534 heating degree days and 744 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Altona scores 64/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. For planning purposes, look to the monthly tables above: shoulder seasons bring the mildest highs and lows, summer brings July-driven heat, and deep winter brings January-driven cold. Treat every figure here as a thirty-year average rather than a forecast - individual years routinely run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Altona, IL? ▼
The average annual temperature in Altona, Illinois is 49°F. The warmest month averages 83°F (29°C) and the coldest averages 13°F (-11°C).
How much rain does Altona get? ▼
Altona receives 39.4 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Altona? ▼
Altona has a climate comfort score of 64/100 (Good), milder than 51% of U.S. cities in the PlainClimate database.
When is the growing season in Altona? ▼
Altona has approximately 167 frost-free days per year, with the last spring freeze around April 28 and the first fall freeze around October 12.
How much energy does heating and cooling require in Altona? ▼
Altona has 6,534 heating degree days and 744 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 Altona climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00110140 near Altona.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00110140. 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.