Reservoir · United States
Lake Berryessa
Reservoir in Napa County, California, United States
- Area
- 66.3km²
- Max depth
- 61m
- Average depth
- 30m
- Elevation
- 131m a.s.l.
- Shoreline
- 114km
- Volume
- 2.0km³
Lake Berryessa is a reservoir in United States. It covers 66.3 km². On average it is 30 m deep, and 61 m at its deepest point. Its surface lies 131 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake Berryessa?
The water is warmest in July, around 27 °C at the surface, and coldest in January, around 10 °C. The surface averages 20 °C or more from May to October: comfortable for most swimmers.
It does not normally freeze in winter.
On the shore, afternoons reach 32 °C on average in July and 12 °C in December. The driest month is August (1 mm of rain), the wettest December (163 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (228 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 | 10 | 11 | 12 | 3 | 120 | 12 | 5.0 | 10 |
| February | 10 | 11 | 14 | 4 | 123 | 10 | 6.3 | 11 |
| March | 13 | 15 | 16 | 5 | 97 | 10 | 7.6 | 11 |
| April | 17 | 19 | 18 | 6 | 46 | 6 | 9.7 | 11 |
| May | 21 | 23 | 23 | 9 | 22 | 4 | 11.5 | 12 |
| June | 25 | 26 | 28 | 11 | 6 | 1 | 13.3 | 12 |
| July | 27 | 27 | 32 | 13 | 1 | 0 | 13.3 | 12 |
| August | 27 | 27 | 31 | 13 | 1 | 0 | 12.1 | 11 |
| September | 24 | 26 | 30 | 12 | 3 | 1 | 10.7 | 11 |
| October | 20 | 22 | 24 | 9 | 34 | 4 | 8.5 | 10 |
| November | 16 | 18 | 17 | 5 | 72 | 8 | 6.4 | 10 |
| December | 12 | 13 | 12 | 3 | 163 | 12 | 4.6 | 11 |
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 3.0 years before flowing out.
- Its catchment drains 1,493 km² of land.
- About 21 m³ of water flow out every second, on average.
- Its shoreline is 4.0 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Lake Berryessa
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 3beaches and swimming spots
- 10campsites
Camp Site 56-72, Camp Site 36-55, Camp Site 73-100, Camp Site 1-35, Spanish Flat Camp Site and 5 more
- 1boat hire and water-sport clubs
Markley Cove Resort
- 4marinas and slipways
- —ferry piers
- 5viewpoints
Lake Berryessa Viewpoint, Glory Hole
- 1hotels, B&Bs and chalets
Canyon Creek resort
- —fishing spots
- 1restaurants and cafés
Nearest airport with scheduled flights: Charles M. Schulz Sonoma County Airport (STS), 50 km in a straight line.
Car hire at STS airport (Santa Rosa)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 | 12.2 | 13.5 | 15.7 | 18.1 | 22.7 | 28.4 | 31.6 | 31.3 | 29.6 | 24.1 | 16.9 | 12.1 |
| 2020 | +0.2 | +2.6 | −0.6 | +2.7 | +2.2 | +2.3 | +0.6 | +1.7 | +1.8 | +4.2 | +0.6 | +2.1 |
| 2021 | +1.1 | +1.8 | +0.2 | +4.0 | +4.8 | +2.5 | +1.5 | +0.5 | +0.2 | −2.8 | −0.4 | −1.3 |
| 2022 | +1.4 | +1.9 | +2.2 | +1.5 | +1.9 | +1.7 | −0.4 | +0.9 | +0.9 | +1.9 | −1.7 | −0.6 |
| 2023 | −0.8 | −1.9 | −3.8 | ±0.0 | −2.4 | −3.4 | +1.3 | +1.2 | −2.3 | +0.9 | +0.9 | +2.3 |
| 2024 | +0.9 | −0.3 | −1.2 | +0.8 | +1.3 | +3.0 | +3.8 | +0.2 | +1.1 | +3.4 | −1.5 | +1.4 |
| 2025 | +0.8 | +0.1 | −0.8 | +0.9 | +2.2 | +1.1 | −2.0 | +1.5 | −0.5 | −1.8 | +0.8 | +1.7 |
+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 (Q771189) · 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.
