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In page Alamo, California:

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Alamo experiences a warm-summer Mediterranean climate with hot, dry summers and cool, rainy winters. Summer high temperatures are hot, but due to the high degree of seasonal diurnal temperature variation, the mean temperature remains low enough to qualify as a warm-summer Mediterranean climate, staying below 71.6 °F (22.0 °C). Temperatures occasionally reach 100 °F (38 °C) or higher in the warmest months, and frost occurs on some clear mornings during the coldest months.[citation needed] There are, on average 42 days per annum with at least 0.1 inches (2.5 mm) of rain (days when it is considered useful to carry an umbrella). During cold winter storms, snow can fall on top of nearby Mount Diablo, but very seldom falls in the Valley.