Marseilles Lock, 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 Marseilles Lock's primary NOAA station, MARSEILLES LOCK.
The climate verdict for Marseilles Lock
Marseilles Lock, Illinois has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 50°F. Its climate comfort score of 59/100 (moderate) lands mid-pack nationally, exceeding 37% of station-mapped location scores.
- 50°F
- average temperature, NOAA 1991-2020 normal
- 59/100
- comfort score, above 37% of station-mapped location scores
- 39.0"
- annual precipitation · 25" snow
- 173 days
- frost-free days per growing season
Marseilles Lock: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00115372 · Marseilles Lock, IL 50°F mean · 39.0" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 50°F
- RANK-COOL #2,607
- PHOTO-FINISH ≈ Lowell
- PRCP-MID 39.0"
- SWING-WIDE 50°F
- COMF-MID 59/100
- LOAD-HEAT 6,351 HDD
- STN-1 USC00115372
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Lowell, IN (+ 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.
- Marseilles Lock (this station) 50°F
- Cold Chicago Botanic…, IL 50°F
- Hot West Chicago Du…, IL 50°F
- Near Lowell, IN 50°F
- Near Big Springs, NE 50°F
Climate Living Index · Marseilles Lock
Marseilles Lock: 52/100 · grade D
Marseilles Lock publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Marseilles Lock, not an official NOAA rating. Rankings still use Comfort Score 59/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 39.0 in · 4.0 from 35 in | 85/100 · A |
| Normal heat + freeze calendar | 142 calendar days | 52/100 · D |
| Frost-free season | 173 days/year | 44/100 · D |
| Snowfall burden | 25.0 inches/year | 44/100 · D |
| Annual temperature balance | 49.7°F · 17.8° from 67.5°F | 39/100 · F |
Marseilles Lock · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Marseilles Lock is a continental Köppen climate: Dfa
Coldest-month mean 22.8°F and warmest-month mean 73.0°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
- 73.0°F
- Coldest month
- 22.8°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 Marseilles Lock sits across the climate record
Three NOAA fields for Marseilles Lock's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 38th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 56th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 81%
- Warmest-to-coldest month gap for Marseilles Lock is large versus 6,861 complete station-years.
How Marseilles Lock compares across U.S. station-mapped locations
Marseilles Lock's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
59 37th percentile score exceeds 37% 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%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 31°F (0°C) | 14°F (-10°C) | 23°F (-5°C) | 1.9" | 8.4" | 28.6 | 0.0 |
| February | 35°F (2°C) | 17°F (-8°C) | 26°F (-3°C) | 1.9" | 7.3" | 25.4 | 0.0 |
| March | 48°F (9°C) | 27°F (-3°C) | 37°F (3°C) | 2.5" | 2.9" | 23.1 | 0.0 |
| April | 61°F (16°C) | 37°F (3°C) | 49°F (10°C) | 3.6" | 0.3" | 9.3 | 0.0 |
| May | 73°F (23°C) | 49°F (9°C) | 61°F (16°C) | 4.7" | 0.0" | 1.0 | 0.9 |
| June | 81°F (27°C) | 58°F (15°C) | 70°F (21°C) | 4.9" | 0.0" | 0.0 | 3.3 |
| July | 84°F (29°C) | 62°F (17°C) | 73°F (23°C) | 3.9" | 0.0" | 0.0 | 5.2 |
| August | 82°F (28°C) | 61°F (16°C) | 72°F (22°C) | 4.1" | 0.0" | 0.0 | 2.8 |
| September | 77°F (25°C) | 53°F (12°C) | 65°F (18°C) | 3.5" | 0.0" | 0.0 | 2.1 |
| October | 64°F (18°C) | 41°F (5°C) | 53°F (12°C) | 3.2" | 0.0" | 5.7 | 0.0 |
| November | 49°F (10°C) | 30°F (-1°C) | 40°F (4°C) | 2.7" | 0.8" | 18.4 | 0.0 |
| December | 37°F (3°C) | 21°F (-6°C) | 29°F (-2°C) | 2.1" | 5.3" | 27.2 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 84°F around July 11, short of 90°F on every date, while 142 dates carry a normal low at or below freezing, the coldest 13°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into March 30, then returns to freezing around November 10, covering 142 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 April 29, when 41% of years recorded at least a hundredth of an inch. The driest is September 16 at 28%. Summed across the calendar, that is about 124 wet dates a year.
The widest day
April 27 carries the biggest normal gap between afternoon and dawn, 25°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Marseilles Lock.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 8.4"
10.7 days with precipitation
Snow: 7.3"
9.7 days with precipitation
Snow: 2.9"
11.1 days with precipitation
Snow: 0.3"
12.0 days with precipitation
12.1 days with precipitation
11.3 days with precipitation
9.3 days with precipitation
9.1 days with precipitation
8.4 days with precipitation
9.5 days with precipitation
Snow: 0.8"
9.9 days with precipitation
Snow: 5.3"
10.8 days with precipitation
Marseilles Lock 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. Marseilles Lock has no dry season to plan around, though it does carry a wide 50.2°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 4.9" and February 1.9". 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.
How Marseilles Lock's precipitation splits across the calendar
About 124 days a year record measurable precipitation here, carrying 39.0" between them, or roughly 0.32 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.
Winter brings real snow to Marseilles Lock
Marseilles Lock averages 25.0 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 17 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 25.0 inches of depth.
- Days recording measurable snow: about 17 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 6% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 17
50% probability date
Last Spring Freeze
April 27
50% probability date
Growing Season
173 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,351
Higher = more heating needed
Cooling Degree Days
800
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside IL closest to Marseilles Lock 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 (50°F here).
- Ashland, OH 50°F · 0.0°F off
- Baring, WA 50°F · 0.0°F off
- Benton Harbor, MI 50°F · 0.0°F off
- Big Springs, NE 50°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (39.0" here), excluding temperature-peer places.
- Delphi, IN 39.0" · 0.0" off
- Perrysville, IN 39.0" · 0.0" off
- Columbia City, IN 39.1" · 0.0" off
- Bloomfield, IA 39.1" · 0.1" off
Snow and freeze rhythm
When cold and snow define Marseilles Lock
heating led · moderate · mid swing
Marseilles Lock's energy balance leans toward cold weather: 6,351 annual heating degree days against 800 for cooling. Its 50.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Marseilles Lock's frost-free season lasts about 173 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Marseilles Lock coldest normal
January
Averaging 23°F (-5°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Marseilles Lock typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Marseilles Lock snow peak
January
Marseilles Lock averages 25.0 inches of snow a year, with January the snowiest month on the normals.
Questions about Marseilles Lock's climate
How much snow does Marseilles Lock get? ▼
How cold does Marseilles Lock get in winter? ▼
How much energy does heating and cooling require in Marseilles Lock? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Marseilles Lock's primary station: MARSEILLES LOCK (USC00115372). 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 Marseilles Lock; 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 Marseilles Lock 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.