Climate
The National Weather Service has maintained two cooperative weather stations in the park since June 1965. Official data documents the desert climate with less than 10 inches of annual rainfall, as well as very warm, mostly dry summers and cold, occasionally wet winters. Snowfall is generally light during the winter.
The station in The Neck region reports average January temperatures ranging from a high of 37.0 °F (2.8 °C) to a low of 20.7 °F (−6.3 °C). Average July temperatures range from a high of 90.7 °F (32.6 °C) to a low of 65.8 °F (18.8 °C). There are an average of 43.3 days with highs of 90 °F (32 °C) or higher and an average of 124.3 days with lows of 32 °F (0 °C) or lower. The highest recorded temperature was 105 °F (41 °C) on July 15, 2005, and the lowest recorded temperature was −13 °F (−25 °C) on February 6, 1989. Average annual precipitation is 9.07 inches. There are an average of 59 days with measurable precipitation. The wettest year was 1984, with 13.66 inches, and the driest year was 1989, with 4.63 inches. The most precipitation in one month was 5.19 inches in October 2006. The most precipitation in 24 hours was 1.76 inches on April 9, 1978. Average annual snowfall is 22.9 inches. The most snowfall in one year was 47.4 inches in 1975, and the most snowfall in one month was 27.0 inches in January 1978.
The station in The Needles region reports average January temperatures ranging from a high of 41.2 °F (5.1 °C) to a low of 16.6 °F (−8.6 °C). Average July temperatures range from a high of 95.4 °F (35.2 °C) to a low of 62.4 °F (16.9 °C). There are an average of 75.4 days with highs of 90 °F (32 °C) or higher and an average of 143.6 days with lows of 32 °F (0 °C) or lower. The highest recorded temperature was 107 °F on July 13, 1971, and the lowest recorded temperature was −16 °F (−27 °C) on January 16, 1971. Average annual precipitation is 8.49 inches. There are an average of 56 days with measurable precipitation. The wettest year was 1969, with 11.19 inches, and the driest year was 1989, with 4.25 inches. The most precipitation in one month was 4.43 inches in October 1972. The most precipitation in 24 hours was 1.56 inches on September 17, 1999. Average annual snowfall is 14.4 inches. The most snowfall in one year was 39.3 inches in 1975, and the most snowfall in one month was 24.0 inches in March 1985.
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