Hennepin Wtr Trmt Plt, IL Climate: Temperature by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Hennepin Wtr Trmt Plt's primary NOAA station, HENNEPIN WTR TRMT PLT.
The climate verdict for Hennepin Wtr Trmt Plt
Hennepin Wtr Trmt Plt, Illinois has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 51°F. July is the warmest month at 75°F and January the coldest at 24°F.
- 51°F
- yearly average temperature, NOAA normal
- 176 days
- frost-free growing season
Hennepin Wtr Trmt Plt: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00114013 · Hennepin Wtr Trmt Plt, IL 51°F mean
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-UNK · SWING-WIDE · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 51°F
- RANK-MID #3,087
- PHOTO-FINISH ≈ Valentine Nwr
- PRCP-UNK Rain n/a
- SWING-WIDE 51°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 6,053 HDD
- STN-1 USC00114013
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Valentine Nwr, NE ( -0.1 °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 IL station list.
- Hennepin Wtr Tr… (this station) 51°F
- Cold Valentine Nwr, NE 51°F
- Hot Tarkio, MO 51°F
- Near Normal, IL 51°F
- Near Romeoville, IL 51°F
Climate Living Index · Hennepin Wtr Trmt Plt
Hennepin Wtr Trmt Plt: 49/100 · grade D
Hennepin Wtr Trmt Plt publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Hennepin Wtr Trmt Plt, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 138 calendar days | 54/100 · D |
| Frost-free season | 176 days/year | 47/100 · D |
| Annual temperature balance | 51.0°F · 16.5° from 67.5°F | 45/100 · D |
Hennepin Wtr Trmt Plt · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Hennepin Wtr Trmt Plt sits across the climate record
Available NOAA 1991–2020 fields for Hennepin Wtr Trmt Plt are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- 45th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Seasonal temperature swing
- Wider than 84%
- Warmest-to-coldest month gap for Hennepin Wtr Trmt Plt is large versus 6,861 complete station-years.
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 33°F (0°C) | 15°F (-9°C) | 24°F (-5°C) | N/A | 28.4 | 0.0 |
| February | 37°F (3°C) | 18°F (-8°C) | 28°F (-2°C) | N/A | 25.6 | 0.0 |
| March | 50°F (10°C) | 28°F (-2°C) | 39°F (4°C) | N/A | 22.6 | 0.0 |
| April | 63°F (17°C) | 38°F (3°C) | 51°F (10°C) | N/A | 9.4 | 0.2 |
| May | 74°F (24°C) | 50°F (10°C) | 62°F (17°C) | N/A | 1.0 | 1.2 |
| June | 83°F (28°C) | 60°F (15°C) | 71°F (22°C) | N/A | 0.0 | 7.1 |
| July | 86°F (30°C) | 63°F (17°C) | 75°F (24°C) | N/A | 0.0 | 8.9 |
| August | 85°F (29°C) | 61°F (16°C) | 73°F (23°C) | N/A | 0.0 | 7.2 |
| September | 79°F (26°C) | 53°F (11°C) | 66°F (19°C) | N/A | 0.4 | 4.0 |
| October | 66°F (19°C) | 42°F (5°C) | 54°F (12°C) | N/A | 6.2 | 0.4 |
| November | 51°F (11°C) | 31°F (-1°C) | 41°F (5°C) | N/A | 18.9 | 0.0 |
| December | 38°F (3°C) | 20°F (-7°C) | 29°F (-2°C) | N/A | 27.4 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 87°F around July 10, short of 90°F on every date, while 138 dates carry a normal low at or below freezing, the coldest 14°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into March 29, then returns to freezing around November 13, covering 138 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.
The widest day
September 23 carries the biggest normal gap between afternoon and dawn, 27°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Hennepin Wtr Trmt Plt.
Monthly Precipitation
Average monthly rainfall
Frost Dates & Growing Season
First Fall Freeze
October 17
50% probability date
Last Spring Freeze
April 24
50% probability date
Growing Season
176 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,053
Higher = more heating needed
Cooling Degree Days
979
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IL closest to Hennepin Wtr Trmt Plt 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 (51°F here).
- Deseret, UT 51°F · 0.0°F off
- Elwood, IN 51°F · 0.0°F off
- Gothenburg, NE 51°F · 0.0°F off
- Hastings, NE 51°F · 0.0°F off
Data-derived climate profile
How Hennepin Wtr Trmt Plt's climate pattern fits together
heating led · mid swing
Hennepin Wtr Trmt Plt's energy balance leans toward cold weather: 6,053 annual heating degree days against 979 for cooling. Its 51.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Hennepin Wtr Trmt Plt's frost-free season lasts about 176 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Hennepin Wtr Trmt Plt's middle-range seasonal profile. The measured spread is 51.0°F. The annual average is 51°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
A moisture-range label is withheld because Hennepin Wtr Trmt Plt's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
These labels group NOAA 1991-2020 normals from Hennepin Wtr Trmt Plt's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Hennepin Wtr Trmt Plt, not an official NOAA class or a year-ahead forecast.
Questions about Hennepin Wtr Trmt Plt's climate
How cold does Hennepin Wtr Trmt Plt get in winter? ▼
How much energy does heating and cooling require in Hennepin Wtr Trmt Plt? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Hennepin Wtr Trmt Plt's primary station: HENNEPIN WTR TRMT PLT (USC00114013). 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 Hennepin Wtr Trmt Plt; 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 Hennepin Wtr Trmt Plt 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.