New Boston Dam, IL Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from New Boston Dam's primary NOAA station, NEW BOSTON DAM 17.
The climate verdict for New Boston Dam
New Boston Dam, Illinois has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 51°F. Its climate comfort score of 68/100 (good) lands mid-pack nationally, exceeding 56% of station-mapped location scores.
- 51°F
- yearly average temperature, NOAA normal
- 68/100
- comfort score, above 56% of station-mapped location scores
- 36.3"
- precipitation, annual total
- 193 days
- growing season, frost-free days
New Boston Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00116080 · New Boston Dam, IL 51°F mean · 36.3" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 51°F
- RANK-MID #3,156
- PHOTO-FINISH ≈ Moline Quad City
- PRCP-MID 36.3"
- SWING-WIDE 52°F
- COMF-MID 68/100
- LOAD-HEAT 6,023 HDD
- STN-1 USC00116080
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Moline Quad City, IL (+ 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.
- New Boston Dam (this station) 51°F
- Hot Minonk, IL 51°F
- Near Moline Quad City, IL 51°F
- Near Grantsville, UT 51°F
- Near Aurora, NE 51°F
Climate Living Index · New Boston Dam
New Boston Dam: 61/100 · grade C
New Boston Dam publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for New Boston Dam, not an official NOAA rating. Rankings still use Comfort Score 68/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 36.3 in · 1.3 from 35 in | 93/100 · A |
| Frost-free season | 193 days/year | 59/100 · C |
| Normal heat + freeze calendar | 129 calendar days | 59/100 · C |
| Annual temperature balance | 51.2°F · 16.3° from 67.5°F | 46/100 · D |
New Boston Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
New Boston Dam is a continental Köppen climate: Dfa
Coldest-month mean 23.4°F and warmest-month mean 75.7°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 75.7°F
- Coldest month
- 23.4°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 New Boston Dam sits across the climate record
Three NOAA fields for New Boston Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 46th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 50th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 87%
- Warmest-to-coldest month gap for New Boston Dam is large versus 6,861 complete station-years.
How New Boston Dam compares across U.S. station-mapped locations
New Boston Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
68 Top 44% score exceeds 56% 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%). This entry sits in this band.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 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
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) | 15°F (-9°C) | 23°F (-5°C) | 1.3" | 28.5 | 0.0 |
| February | 36°F (2°C) | 19°F (-7°C) | 28°F (-2°C) | 1.7" | 24.6 | 0.0 |
| March | 49°F (9°C) | 30°F (-1°C) | 39°F (4°C) | 2.6" | 19.5 | 0.0 |
| April | 62°F (17°C) | 40°F (5°C) | 51°F (11°C) | 3.6" | 4.8 | 0.0 |
| May | 73°F (23°C) | 52°F (11°C) | 62°F (17°C) | 5.0" | 0.3 | 0.9 |
| June | 83°F (28°C) | 62°F (17°C) | 72°F (22°C) | 4.6" | 0.0 | 5.0 |
| July | 86°F (30°C) | 65°F (19°C) | 76°F (24°C) | 3.5" | 0.0 | 9.9 |
| August | 84°F (29°C) | 63°F (17°C) | 73°F (23°C) | 3.8" | 0.0 | 6.0 |
| September | 77°F (25°C) | 55°F (13°C) | 66°F (19°C) | 3.3" | 0.0 | 2.5 |
| October | 64°F (18°C) | 43°F (6°C) | 54°F (12°C) | 2.9" | 3.4 | 0.2 |
| November | 49°F (10°C) | 32°F (0°C) | 41°F (5°C) | 2.1" | 14.6 | 0.0 |
| December | 37°F (3°C) | 22°F (-6°C) | 29°F (-1°C) | 1.8" | 25.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 86°F around July 11, short of 90°F on every date, while 129 dates carry a normal low at or below freezing, the coldest 15°F near January 20.
The freezing stretch
The normal low stays at or below 32°F into March 22, then returns to freezing around November 15, covering 129 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 8, when 39% of years recorded at least a hundredth of an inch. The driest is January 28 at 24%. Summed across the calendar, that is about 104 wet dates a year.
The widest day
September 20 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for New Boston Dam.
Monthly Precipitation
Average monthly rainfall
7.6 days with precipitation
7.2 days with precipitation
9.0 days with precipitation
10.1 days with precipitation
12.2 days with precipitation
10.1 days with precipitation
7.8 days with precipitation
8.5 days with precipitation
7.5 days with precipitation
8.0 days with precipitation
7.7 days with precipitation
8.1 days with precipitation
New Boston Dam spreads its precipitation across the year
Neither half of the year dominates here: June through August take 33% of the annual total and December through February 13%, with neither reaching the 35% that would mark a distinct wet season. New Boston Dam has no dry season to plan around, though it does carry a wide 52.3°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 5.0" and January 1.3". The three wettest months together take 37% 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.
How New Boston Dam's precipitation splits across the calendar
About 104 days a year record measurable precipitation here, carrying 36.3" between them, or roughly 0.35 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Frost Dates & Growing Season
First Fall Freeze
October 24
50% probability date
Last Spring Freeze
April 14
50% probability date
Growing Season
193 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,023
Higher = more heating needed
Cooling Degree Days
1,032
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IL closest to New Boston Dam 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).
- Bellingham, WA 51°F · 0.0°F off
- Bloomfield, IA 51°F · 0.0°F off
- Burlington, IA 51°F · 0.0°F off
- Denver, CO 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (36.3" here), excluding temperature-peer places.
- Waterloo, IA 36.3" · 0.0" off
- Blanchard, OK 36.3" · 0.0" off
- Mason City, IA 36.3" · 0.0" off
- Medina, TX 36.3" · 0.0" off
Data-derived climate profile
How New Boston Dam's climate pattern fits together
heating led · moderate · mid swing
New Boston Dam's energy balance leans toward cold weather: 6,023 annual heating degree days against 1,032 for cooling. Its 52.3°F seasonal range still makes the monthly rows more useful than the annual average alone.
New Boston Dam's frost-free season lasts about 193 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 New Boston Dam's middle-range seasonal profile. The measured spread is 52.3°F. The annual average is 51°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
New Boston Dam's 36.3 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from New Boston Dam'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 New Boston Dam, not an official NOAA class or a year-ahead forecast.
Questions about New Boston Dam's climate
How much rain does New Boston Dam get? ▼
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from New Boston Dam's primary station: NEW BOSTON DAM 17 (USC00116080). 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 New Boston Dam; 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 New Boston Dam 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.