Climate Comfort Score
68/100
Good
NOAA 1991–2020 normals 51°F annual avg Public-domain federal data
Hennepin, IL Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 51°F
- Avg annual temp
- 68/100
- Comfort score
- 38.6"
- Annual precip
- 187d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Hennepin
Hennepin, Illinois averages 51°F a year and scores 68/100 on the comfort index - good, milder than 58% of U.S. cities.
- 51°F
- annual average temperature (NOAA normal)
- 68/100
- comfort score, milder than 58% of U.S. cities
- 38.6"
- annual precipitation
- 187 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
51°F (11°C)
Avg High
61°F
Avg Low
42°F
Annual Precip
38.6"
Comfort Score
68/100
Good
Avg Annual Temperature
51°F
30-year mean (NOAA NCEI)
Annual Precipitation
38.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Hennepin) 68.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Hennepin area.
How Hennepin compares to every U.S. city
Hennepin's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 42% higher than 58% 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 Hennepin
MethodologyZooming out from Hennepin's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- 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 | 32°F (0°C) | 17°F (-8°C) | 25°F (-4°C) | 1.9" | 27.8 | 0.0 |
| February | 37°F (3°C) | 20°F (-7°C) | 29°F (-2°C) | 1.8" | 24.0 | 0.0 |
| March | 50°F (10°C) | 30°F (-1°C) | 40°F (5°C) | 2.5" | 18.1 | 0.0 |
| April | 64°F (18°C) | 41°F (5°C) | 52°F (11°C) | 3.9" | 5.7 | 0.0 |
| May | 74°F (23°C) | 51°F (11°C) | 63°F (17°C) | 4.8" | 0.1 | 0.8 |
| June | 82°F (28°C) | 61°F (16°C) | 72°F (22°C) | 4.5" | 0.0 | 3.3 |
| July | 85°F (29°C) | 65°F (18°C) | 75°F (24°C) | 3.9" | 0.0 | 6.3 |
| August | 83°F (28°C) | 62°F (17°C) | 73°F (23°C) | 3.8" | 0.0 | 3.4 |
| September | 77°F (25°C) | 55°F (13°C) | 66°F (19°C) | 3.5" | 0.0 | 2.8 |
| October | 65°F (18°C) | 43°F (6°C) | 54°F (12°C) | 3.3" | 3.1 | 0.0 |
| November | 50°F (10°C) | 32°F (0°C) | 41°F (5°C) | 2.6" | 16.0 | 0.0 |
| December | 37°F (3°C) | 22°F (-6°C) | 29°F (-1°C) | 2.2" | 24.2 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 1.9"
February 1.8"
March 2.5"
April 3.9"
May 4.8"
June 4.5"
July 3.9"
August 3.8"
September 3.5"
October 3.3"
November 2.6"
December 2.2"
Frost Dates & Growing Season
First Fall Freeze
October 22
50% probability date
Last Spring Freeze
April 18
50% probability date
Growing Season
187 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,869
Higher = more heating needed
Cooling Degree Days
946
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Hennepin's climate means for you
Hennepin runs 51°F a year - peaking in July, coldest in January.
- Gardeners get about 187 frost-free days, with the last spring freeze near April 18 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,869 heating and 946 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: Hennepin, IL
Based on station USC00114012 feeding NOAA's 1991–2020 climate normals, Hennepin, Illinois averages 51°F a year, ranging from a mean daily high of 61°F to a mean daily low of 42°F. July is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.
Beyond temperature, Hennepin averages 38.6 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 187 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 22. Turning to energy use, 5,869 heating degree days and 946 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Hennepin scores 68/100 (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 Hennepin, IL? ▼
The average annual temperature in Hennepin, Illinois is 51°F. The warmest month averages 85°F (29°C) and the coldest averages 17°F (-8°C).
How much rain does Hennepin get? ▼
Hennepin receives 38.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Hennepin? ▼
Hennepin has a climate comfort score of 68/100 (Good), milder than 58% of U.S. cities in the PlainClimate database.
When is the growing season in Hennepin? ▼
Hennepin has approximately 187 frost-free days per year, with the last spring freeze around April 18 and the first fall freeze around October 22.
How much energy does heating and cooling require in Hennepin? ▼
Hennepin has 5,869 heating degree days and 946 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 Hennepin climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00114012 near Hennepin.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00114012. 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.