The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. Please reload the page and try again. Heavy snow also possible in the Upper Midwest from a clipper system. (MORE: When Is the Warmest Day of the Year?). The wetter season lasts 5.2 months, from November 4 to April 10, with a greater than 14% chance of a given day being a wet day. The issue could be temporary or permanent. As it descends, this only-slightly-cooler air heats up again. Alaska's record was set in Fort Yukon on June 27, 1915, and Hawaii's record occurred on April 27, 1931, near Pahala on the Big Island. Future US, Inc. Full 7th Floor, 130 West 42nd Street, The clearest month of the year in Tracy is August, during which on average the sky is clear, mostly clear, or partly cloudy 91% of the time. The cool season lasts for 2.7 months, from November 24 to February 15, with an average daily high temperature below 62F. Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. Heber Black Mesa Ranger Station is a two-and-a-half-hour drive from Phoenix and is a ranger district on the Apache-Sitgreaves National Forests. Among U.S. stations with long periods of record spanning at least 40 years, there were at least 12 sites that tied or exceeded their previous all-time (any day) heat record during the July 9-11 western U.S. heat wave (kudos to Maximiliano Herrera for this list): July 9:Grand Junction, CO: 107F (41.7C), new recordTonopah, NV: 104F (40.0C), tied, July 10:St. George, UT: 117F (47.2C), ties all-time state record for UtahFarmington, NM: 106F (41.1C), new recordSt. Average highs in the summer months in these barren salt flats regularly hit above 100 degrees Fahrenheit (38 degrees Celsius). The brightest month of the year in Tracy is June, with an average of 8.3 kWh. //-->,