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The climate of California ... Average annual precipitation Percent ... Some areas of Coast Redwood forest receive over 100 inches (2,500 mm) of precipitation per year.
Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (−9.25 percent). [89]
Historically, El Niño conditions were present during sixteen winters between 1951 and 2015. Six of those had below-average rainfall, five had average rainfall, and five had above-average rainfall. However, as of May 2015, drought conditions had worsened and above average ocean temperatures had not resulted in large storms. [30]
Most cold fronts and depressions spun off by the polar low, the strong winter seasonal low-pressure area in the Gulf of Alaska, fail to carry significant precipitable moisture as far south as Los Angeles, resulting in the region's relatively low average rainfall amount of 12–15 inches (300–380 mm) even in normal years. However, a "normal ...
Without climate change, the drought was probably finished already in 2005. [28] 42% of its severity is due to temperature rise as a result of climate change. 88% of the area was drought-stricken. The flow of the Colorado river supplying water to seven states had "[shrunk] to the lowest two-year average in more than a century of record keeping".
The maps are derived from U.S. climate normals provided by the National Centers for Environment Information (NCEI): The dataset consists of the latest 30-year average of weather data, including ...
For the period between the start of October and late January, Purdue said, 10 inches would be considered normal — making 2022-23’s precipitation above average and 2023-24 nearly there.
The highest recorded rainfall in a single year was 22,987 mm (904.9 in) in 1861. The 38-year average at Mawsynram, Meghalaya, India is 11,873 mm (467.4 in). [27] Lower rainfall maxima are found on the Mediterranean and Black Sea coasts of Turkey and the mountains of Tajikistan.