Lake · Japan
Lake Kasumigaura
Lake in Ibaraki Prefecture, Kantō region, Japan
- Area
- 168km²
- Max depth
- 4m
- Average depth
- 7.0m
- Elevation
- 0m a.s.l.
- Shoreline
- 127km
- Volume
- 1.2km³
Lake Kasumigaura is a lake in Japan. It covers 168 km². On average it is 7.0 m deep, and 4 m at its deepest point. Its surface lies 0 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake Kasumigaura?
The water is warmest in August, around 28 °C at the surface, and coldest in January, around 4 °C. The surface averages 20 °C or more from June to October: comfortable for most swimmers.
It does not normally freeze in winter.
On the shore, afternoons reach 29 °C on average in August and 8 °C in January. The driest month is February (62 mm of rain), the wettest October (225 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (69 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 | 4 | 5 | 8 | 3 | 69 | 6 | 5.9 | 20 |
| February | 5 | 7 | 9 | 3 | 62 | 7 | 5.8 | 20 |
| March | 9 | 11 | 13 | 6 | 106 | 11 | 6.0 | 20 |
| April | 14 | 17 | 17 | 10 | 122 | 12 | 6.1 | 20 |
| May | 20 | 22 | 21 | 15 | 136 | 13 | 6.0 | 18 |
| June | 25 | 27 | 24 | 18 | 162 | 16 | 4.7 | 15 |
| July | 28 | 28 | 27 | 22 | 153 | 17 | 4.7 | 16 |
| August | 28 | 28 | 29 | 24 | 138 | 14 | 5.9 | 15 |
| September | 25 | 27 | 26 | 21 | 195 | 15 | 4.7 | 17 |
| October | 20 | 23 | 21 | 16 | 225 | 13 | 4.3 | 18 |
| November | 14 | 17 | 16 | 11 | 101 | 9 | 4.8 | 17 |
| December | 8 | 10 | 11 | 6 | 72 | 7 | 5.2 | 19 |
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 17 months before flowing out.
- Its catchment drains 1,425 km² of land.
- About 27 m³ of water flow out every second, on average.
- Its shoreline is 2.8 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Lake Kasumigaura
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 1beaches and swimming spots
- —campsites
- —boat hire and water-sport clubs
- 2marinas and slipways
- 2ferry piers
- 1viewpoints
- 5hotels, B&Bs and chalets
- —fishing spots
- 40restaurants and cafés
Towns on the shore
- Tsuchiura144,399 people
- Ami48,553 people
- Namegata32,185 people
- Kihara14,602 people
Nearest airport with scheduled flights: Ibaraki Airport (IBR), 17 km in a straight line.
Car hire at NRT airport (Narita)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 | 8.5 | 9.3 | 12.6 | 16.9 | 20.9 | 23.6 | 27.1 | 28.6 | 25.6 | 21.1 | 16.4 | 11.2 |
| 2020 | +2.1 | +2.0 | +1.2 | −1.2 | +0.4 | +1.1 | −1.3 | +0.7 | +0.6 | −0.7 | +0.8 | −0.2 |
| 2021 | +0.8 | +2.5 | +2.9 | +0.8 | +1.1 | +0.2 | −0.3 | −0.2 | −1.1 | ±0.0 | +0.6 | +0.1 |
| 2022 | −0.8 | −1.0 | +1.1 | +1.0 | −0.1 | +0.5 | +1.2 | +0.1 | +0.6 | −0.3 | +1.6 | +0.1 |
| 2023 | +0.3 | +1.2 | +3.0 | +2.0 | +0.1 | +0.9 | +1.9 | +1.8 | +2.9 | +1.0 | +1.7 | +2.1 |
| 2024 | +2.2 | +2.1 | +0.2 | +2.0 | +1.1 | +1.2 | +2.9 | +1.3 | +2.2 | +2.1 | +1.0 | +0.1 |
| 2025 | +1.5 | +0.2 | +1.5 | +0.9 | −0.1 | +2.0 | +1.8 | +2.1 | +2.6 | +0.5 | +0.2 | +1.2 |
+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 (Q1077984) · 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.
