Grafton Wwtp, WI Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Grafton Wwtp's primary NOAA station, GRAFTON WWTP.
The climate verdict for Grafton Wwtp
Grafton Wwtp, Wisconsin has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 48°F. Its climate comfort score of 68/100 (good) lands mid-pack nationally, exceeding 56% of station-mapped location scores.
- 48°F
- yearly average temperature, NOAA normal
- 68/100
- comfort score, above 56% of station-mapped location scores
- 35.5"
- yearly precipitation total
- 184 days
- frost-free growing season
Grafton Wwtp: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00473198 · Grafton Wwtp, WI 48°F mean · 35.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 48°F
- RANK-COOL #2,127
- PHOTO-FINISH ≈ Hell
- PRCP-MID 35.5"
- SWING-WIDE 48°F
- COMF-MID 68/100
- LOAD-HEAT 6,775 HDD
- STN-1 USC00473198
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Hell, MI (+ 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 WI station list.
- Grafton Wwtp (this station) 48°F
- Cold Mt Morris, NY 48°F
- Hot Hell, MI 48°F
- Near E Milford, NH 48°F
- Near Shoup, ID 48°F
Climate Living Index · Grafton Wwtp
Grafton Wwtp: 54/100 · grade D
Grafton Wwtp publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Grafton Wwtp, not an official NOAA rating. Rankings still use Comfort Score 68/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 35.5 in · 0.5 from 35 in | 95/100 · A |
| Frost-free season | 184 days/year | 53/100 · D |
| Normal heat + freeze calendar | 141 calendar days | 52/100 · D |
| Annual temperature balance | 47.9°F · 19.6° from 67.5°F | 31/100 · F |
Grafton Wwtp · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Grafton Wwtp is a continental Köppen climate: Dfb
Coldest-month mean 23.5°F and warmest-month mean 71.5°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 71.5°F
- Coldest month
- 23.5°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 Grafton Wwtp sits across the climate record
Three NOAA fields for Grafton Wwtp's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 31st percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 49th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 73%
- Warmest-to-coldest month gap for Grafton Wwtp is large versus 6,861 complete station-years.
How Grafton Wwtp compares across U.S. station-mapped locations
Grafton Wwtp'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 | 30°F (-1°C) | 17°F (-8°C) | 24°F (-5°C) | 1.6" | 29.1 | 0.0 |
| February | 33°F (1°C) | 19°F (-7°C) | 26°F (-3°C) | 1.7" | 26.3 | 0.0 |
| March | 43°F (6°C) | 26°F (-3°C) | 35°F (1°C) | 2.1" | 22.1 | 0.0 |
| April | 54°F (12°C) | 36°F (2°C) | 45°F (7°C) | 3.9" | 8.0 | 0.0 |
| May | 66°F (19°C) | 46°F (8°C) | 56°F (13°C) | 4.0" | 0.4 | 0.1 |
| June | 76°F (24°C) | 56°F (13°C) | 66°F (19°C) | 4.5" | 0.0 | 0.7 |
| July | 81°F (27°C) | 62°F (17°C) | 72°F (22°C) | 3.6" | 0.0 | 2.8 |
| August | 80°F (27°C) | 61°F (16°C) | 70°F (21°C) | 3.8" | 0.0 | 1.5 |
| September | 73°F (23°C) | 54°F (12°C) | 63°F (17°C) | 3.2" | 0.0 | 0.4 |
| October | 61°F (16°C) | 43°F (6°C) | 52°F (11°C) | 3.0" | 4.4 | 0.0 |
| November | 46°F (8°C) | 31°F (0°C) | 39°F (4°C) | 2.1" | 17.2 | 0.0 |
| December | 35°F (2°C) | 21°F (-6°C) | 28°F (-2°C) | 2.0" | 26.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 82°F around July 23, short of 90°F on every date, while 141 dates carry a normal low at or below freezing, the coldest 17°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into April 2, then returns to freezing around November 14, covering 141 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
May 21 carries the biggest normal gap between afternoon and dawn, 20°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Grafton Wwtp.
Where Grafton Wwtp Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 20°F.
Grafton Wwtp earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Grafton Wwtp 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 15%, with neither reaching the 35% that would mark a distinct wet season. Grafton Wwtp has no dry season to plan around, though it does carry a wide 48°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 4.5" and January 1.6". The three wettest months together take 35% 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.
Frost Dates & Growing Season
First Fall Freeze
October 24
50% probability date
Last Spring Freeze
April 23
50% probability date
Growing Season
184 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,775
Higher = more heating needed
Cooling Degree Days
564
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WI closest to Grafton Wwtp 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 (48°F here).
- Arnold, NE 48°F · 0.0°F off
- Avon, NY 48°F · 0.0°F off
- Belle Fourche, SD 48°F · 0.0°F off
- Cascade, IA 48°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (35.5" here), excluding temperature-peer places.
- Brockport, NY 35.5" · 0.0" off
- Northwood, IA 35.5" · 0.0" off
- Owatonna, MN 35.5" · 0.0" off
- Faribault, MN 35.5" · 0.1" off
Data-derived climate profile
How Grafton Wwtp's climate pattern fits together
heating led · moderate · mid swing
Grafton Wwtp's energy balance leans toward cold weather: 6,775 annual heating degree days against 564 for cooling. Its 48.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Grafton Wwtp's frost-free season lasts about 184 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 Grafton Wwtp's middle-range seasonal profile. The measured spread is 48.0°F. The annual average is 48°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Grafton Wwtp's 35.5 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 Grafton Wwtp'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 Grafton Wwtp, not an official NOAA class or a year-ahead forecast.
Questions about Grafton Wwtp's climate
How much rain does Grafton Wwtp get? ▼
How cold does Grafton Wwtp get in winter? ▼
How much energy does heating and cooling require in Grafton Wwtp? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Grafton Wwtp's primary station: GRAFTON WWTP (USC00473198). 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 Grafton Wwtp; 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 Grafton Wwtp 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.