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Reference.org
Calistoga AVA
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<p>Calistoga is an <a href="/facts/American_Viticultural_Area/BpCGWUsQ">American Viticultural Area</a> located in the northern portion of <a href="/facts/California/zLW2vdQJ">California</a>'s <a href="/facts/Napa_Valley_AVA/MLglpafn">Napa Valley AVA</a>. The <a href="/facts/Appellation/7xwfKzsY">appellation</a> is distinguished by its <a href="/facts/List_of_vineyard_soil_types/UG5TCyoT">volcanic soil</a>, high temperatures up to 100 °F (38 °C) during the day, and cool nights during the growing season due to breezes from the <a href="/facts/Russian_River_(California)/0fA408mv">Russian River</a>, causing the highest <a href="/facts/Diurnal_temperature_variation/nqz0KRKV">diurnal temperature variation</a> in the Napa Valley—up to 50 °F (28 °C). </p>