Belleville Siu Rsch, IL Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Belleville Siu Rsch's primary NOAA station, BELLEVILLE SIU RSCH.
The climate verdict for Belleville Siu Rsch
Belleville Siu Rsch, Illinois has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 58°F. It scores 78/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 72% of them.
- 58°F
- yearly average temperature, NOAA normal
- 78/100
- comfort score, above 72% of station-mapped location scores
- 43.4"
- annual precipitation · 11" snow
- 191 days
- frost-free days per growing season
Belleville Siu Rsch: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00013802 · Belleville Siu Rsch, IL 58°F mean · 43.4" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 58°F
- RANK-UPPER #4,665
- PHOTO-FINISH ≈ Phila Franklin…
- PRCP-MID 43.4"
- SWING-WIDE 45°F
- COMF-TOP 78/100
- LOAD-HEAT 4,209 HDD
- STN-1 USW00013802
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Phila Franklin Inst, PA (+ 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 IL station list.
- Belleville Siu… (this station) 58°F
- Cold Providence, KY 58°F
- Hot Mina, NV 58°F
- Near Phila Franklin…, PA 58°F
- Near Pampa, TX 58°F
Climate Living Index · Belleville Siu Rsch
Belleville Siu Rsch: 59/100 · grade C
Belleville Siu Rsch publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Belleville Siu Rsch, not an official NOAA rating. Rankings still use Comfort Score 78/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 43.4 in · 8.4 from 35 in | 71/100 · B |
| Annual temperature balance | 57.7°F · 9.8° from 67.5°F | 69/100 · C |
| Snowfall burden | 11.2 inches/year | 61/100 · C |
| Normal heat + freeze calendar | 127 calendar days | 60/100 · C |
| Frost-free season | 191 days/year | 58/100 · C |
| Summer moisture balance | 66.9°F mean dew point | 27/100 · F |
Belleville Siu Rsch · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Belleville Siu Rsch is a temperate Köppen climate: Cfa
Coldest-month mean 33.6°F and warmest-month mean 79.0°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 79.0°F
- Coldest month
- 33.6°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 Belleville Siu Rsch sits across the climate record
Three NOAA fields for Belleville Siu Rsch's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 68th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 65th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 61st percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Belleville Siu Rsch compares across U.S. station-mapped locations
Belleville Siu Rsch's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
78 Top 28% score exceeds 72% 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%). Below this entry.
- 70–80: 650 station-mapped locations (11%). This entry sits in this band.
- 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
Belleville Siu Rsch's measured station temperature trend
MethodologyAcross 58 complete annual observations from 1949 to 2025, BELLEVILLE SIU RSCH warmed at a fitted rate of 0.10°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Belleville Siu Rsch primary station fitted change +0.10 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 43°F (6°C) | 24°F (-4°C) | 34°F (1°C) | 2.6" | 3.4" | 23.6 | 0.0 |
| February | 49°F (9°C) | 28°F (-2°C) | 38°F (3°C) | 2.2" | 3.3" | 19.1 | 0.0 |
| March | 59°F (15°C) | 36°F (2°C) | 48°F (9°C) | 3.4" | 1.0" | 12.0 | 0.0 |
| April | 71°F (21°C) | 46°F (8°C) | 58°F (15°C) | 4.9" | 0.0" | 3.1 | 0.1 |
| May | 79°F (26°C) | 56°F (13°C) | 68°F (20°C) | 5.0" | 0.0" | 0.0 | 2.2 |
| June | 87°F (31°C) | 65°F (18°C) | 76°F (24°C) | 4.6" | 0.0" | 0.0 | 11.6 |
| July | 90°F (32°C) | 68°F (20°C) | 79°F (26°C) | 4.0" | 0.0" | 0.0 | 17.1 |
| August | 89°F (32°C) | 65°F (19°C) | 77°F (25°C) | 3.9" | 0.0" | 0.0 | 14.4 |
| September | 83°F (29°C) | 57°F (14°C) | 70°F (21°C) | 3.4" | 0.0" | 0.2 | 6.7 |
| October | 73°F (23°C) | 47°F (8°C) | 60°F (15°C) | 3.1" | 0.0" | 3.0 | 0.7 |
| November | 58°F (15°C) | 37°F (3°C) | 48°F (9°C) | 3.6" | 0.6" | 11.2 | 0.0 |
| December | 46°F (8°C) | 28°F (-2°C) | 37°F (3°C) | 2.6" | 2.9" | 21.3 | 0.0 |
The year, day by day
Belleville Siu Rsch works both ends of the calendar. Normal highs climb to 90°F by July 12 and hold at or above 90°F on 35 dates, then normal lows drop to freezing or below on 92 dates, bottoming at 24°F around January 15.
When the heat sits
Normal highs reach 90°F from July 4 through August 7, covering 35 dates. The broader mild season, normal highs of 70°F or more, runs April 13 to October 22.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into March 1, then returns to freezing around December 1, covering 92 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 3, when 38% of years recorded at least a hundredth of an inch. The driest is September 4 at 21%. Summed across the calendar, that is about 100 wet dates a year.
The widest day
October 1 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 Belleville Siu Rsch.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 3.4"
7.1 days with precipitation
Snow: 3.3"
7.5 days with precipitation
Snow: 1.0"
9.5 days with precipitation
10.3 days with precipitation
11.5 days with precipitation
8.7 days with precipitation
7.4 days with precipitation
7.2 days with precipitation
6.6 days with precipitation
8.4 days with precipitation
Snow: 0.6"
7.7 days with precipitation
Snow: 2.9"
7.7 days with precipitation
Belleville Siu Rsch spreads its precipitation across the year
Neither half of the year dominates here: June through August take 29% of the annual total and December through February 17%, with neither reaching the 35% that would mark a distinct wet season. Belleville Siu Rsch has no dry season to plan around, though it does carry a wide 45.4°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 5.0" and February 2.2". The three wettest months together take 34% 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 Belleville Siu Rsch, it arrives in quantity
43.4" of precipitation falls across only about 100 wet days here, averaging 0.44 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 100 a year, 27% of all days
- Average depth per wet day
- 0.44 inches
- Most wet days
- May, about 12
- Fewest wet days
- September, about 7
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.
Snow reaches Belleville Siu Rsch, but rarely amounts to much
The normals record 11.2 inches of snow a year here, most likely in January. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 7 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
October 20
50% probability date
Last Spring Freeze
April 12
50% probability date
Growing Season
191 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,209
Higher = more heating needed
Cooling Degree Days
1,579
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 72% | 8.3 | 32% | 35% |
| February | 69% | 9.0 | 31% | 35% |
| March | 66% | 8.8 | 32% | 28% |
| April | 70% | 7.7 | 30% | 28% |
| May | 73% | 6.4 | 29% | 20% |
| June | 72% | 5.5 | 33% | 11% |
| July | 75% | 4.7 | 38% | 11% |
| August | 76% | 4.9 | 43% | 12% |
| September | 71% | 5.8 | 49% | 13% |
| October | 70% | 7.4 | 40% | 27% |
| November | 74% | 8.3 | 33% | 34% |
| December | 76% | 8.5 | 32% | 39% |
Nationwide similar cities
Other rankable U.S. places outside IL closest to Belleville Siu Rsch 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 (58°F here).
- Follett, TX 58°F · 0.0°F off
- Sonora, CA 58°F · 0.0°F off
- Wichita, KS 58°F · 0.0°F off
- Williamson, WV 58°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (43.4" here), excluding temperature-peer places.
- Dannemora, NY 43.4" · 0.0" off
- Front Royal, VA 43.4" · 0.0" off
- Bland, VA 43.3" · 0.0" off
- Clinton, MO 43.3" · 0.0" off
Data-derived climate profile
How Belleville Siu Rsch's climate pattern fits together
heating led · moderate · mid swing
Belleville Siu Rsch's energy balance leans toward cold weather: 4,209 annual heating degree days against 1,579 for cooling. Its 45.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
Belleville Siu Rsch'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.
July and January mark the typical warm and cold ends of the calendar in Belleville Siu Rsch's middle-range seasonal profile. The measured spread is 45.4°F. The annual average is 58°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Belleville Siu Rsch's 43.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Annual snowfall totals 11.2 inches. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Belleville Siu Rsch'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 Belleville Siu Rsch, not an official NOAA class or a year-ahead forecast.
Questions about Belleville Siu Rsch's climate
How much rain does Belleville Siu Rsch get? ▼
How many days above 90°F does Belleville Siu Rsch get? ▼
How much energy does heating and cooling require in Belleville Siu Rsch? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Belleville Siu Rsch's primary station: BELLEVILLE SIU RSCH (USW00013802). 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 Belleville Siu Rsch; 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 Belleville Siu Rsch 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.