Reservoir · United States
Geneva Lake
Geneva
Lake in Walworth County, Wisconsin, USA
- Area
- 21.4km²
- Average depth
- 2.3m
- Elevation
- 264m a.s.l.
- Shoreline
- 33km
- Volume
- 0.049km³
Geneva Lake is a reservoir in United States. It covers 21.4 km². On average it is 2.3 m deep. Its surface lies 264 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Geneva Lake?
The water is warmest in August, around 24 °C at the surface, and coldest in January, around 0 °C. The surface averages 20 °C or more from July to September: comfortable for most swimmers.
The lake usually freezes over for about 88 days a year, from around 24 December to 21 March.
On the shore, afternoons reach 28 °C on average in July and -2 °C in January. The driest month is January (41 mm of rain), the wettest June (126 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (116 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | Ice | — | -2 | -11 | 41 | 8 | 3.6 | 20 |
| February | Ice | — | -1 | -10 | 46 | 7 | 5.0 | 20 |
| March | Ice | — | 7 | -4 | 62 | 8 | 5.5 | 19 |
| April | 6 | 9 | 14 | 2 | 94 | 12 | 6.5 | 20 |
| May | 13 | 16 | 20 | 8 | 112 | 13 | 7.2 | 17 |
| June | 20 | 22 | 26 | 14 | 126 | 14 | 8.5 | 15 |
| July | 24 | 25 | 28 | 17 | 102 | 13 | 9.1 | 13 |
| August | 24 | 25 | 27 | 16 | 105 | 12 | 8.1 | 12 |
| September | 21 | 23 | 23 | 12 | 92 | 10 | 7.1 | 15 |
| October | 16 | 19 | 15 | 4 | 82 | 9 | 4.9 | 17 |
| November | 9 | 12 | 8 | -2 | 56 | 8 | 3.8 | 18 |
| December | 2 | 5 | 0 | -8 | 55 | 8 | 2.9 | 18 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 2.1 years before flowing out.
- Its catchment drains 78 km² of land.
- About 0.8 m³ of water flow out every second, on average.
Around the shore
What's around Geneva Lake
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 16beaches and swimming spots
Riviera Beach, Swimming beach and 14 more
- 4campsites
RV Camping @ Big Foot Beach State Park, Tent Camping @ Big Foot Beach State Park, Lake Geneva Youth Camp
- 7boat hire and water-sport clubs
Elmer's Boat Rental, Leather Lips Boat Rentals, Marina Bay Boat Rental, Gordy's, Lake Geneva Yacht Club and 2 more
- 40marinas and slipways
Gage Marine, Fontana Boat Ramp, Abbey Marina and 37 more
- —ferry piers
- 3viewpoints
Lake Geneva Club Historical Gazebo
- 46hotels, B&Bs and chalets
The French Country Inn On The Lake Hotel, Geneva Bay Center, Harbor Shores Hotel, Lakefront Cottage, The Ridge Hotel and Spa and 41 more
- —fishing spots
- 34restaurants and cafés
Towns on the shore
- Lake Geneva7,778 people
- Walworth2,838 people
- Williams Bay2,600 people
- Fontana1,720 people
Nearest airport with scheduled flights: Chicago Rockford International Airport (RFD), 60 km in a straight line.
Car hire at MKE airport (Milwaukee)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | -2.5 | -0.6 | 6.7 | 14.0 | 20.2 | 25.5 | 27.9 | 27.0 | 23.2 | 15.3 | 7.5 | 0.2 |
| 2020 | +2.1 | +0.2 | +0.7 | −1.9 | −1.7 | +0.6 | +0.1 | −0.8 | −2.3 | −2.3 | +2.8 | +0.9 |
| 2021 | +0.8 | −5.3 | +3.0 | +0.9 | ±0.0 | +2.9 | +1.1 | +2.3 | +2.9 | +3.0 | −0.4 | +3.6 |
| 2022 | −2.2 | −0.1 | +0.4 | −2.4 | +0.9 | +0.7 | ±0.0 | +0.4 | −0.4 | +0.4 | +0.5 | −1.5 |
| 2023 | +2.8 | +3.0 | −1.1 | +0.9 | +1.3 | +0.6 | +0.8 | +1.5 | +1.3 | +0.8 | +0.4 | +3.9 |
| 2024 | −0.4 | +6.8 | +2.4 | +1.2 | +2.2 | +0.6 | −1.2 | −0.2 | +3.0 | +4.2 | +2.4 | +1.1 |
| 2025 | −0.6 | −0.3 | +4.1 | +0.9 | −0.2 | +1.8 | +0.9 | −0.6 | +1.9 | +3.1 | +0.7 | −1.1 |
+1 warmer than usual −1 cooler than usual
About these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q14714439) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
