Good harvest conditions in Iowa limited the loss from the derecho and lodged crops. On May 5th, damaging straight-line winds and an associated gustnado were observed in Lancaster County, SC, with the highest estimated gust of 105 mph. In September, many farmers in the Florida Panhandle and southern Alabama reported a loss of cotton, peanuts, and pecans due to the passage of Hurricane Sally. On April 13th, the strongest tornado of the year across the Southeast region occurred in Hampton County, SC. LaGuardia Airport and Central Park, New York, recorded their warmest Novembers on record. All 41 reports occurred on four days. Low streamflow and warm water temperatures prompted several states to take actions to protect aquatic species. In September, every state except for Louisiana and Mississippi experienced cooler than normal temperatures, while every state experienced wetter than normal conditions. Iowa, northern Missouri, and along the Illinois-Wisconsin border had above normal snowfall, but the rest of the region was below normal. In Alabama, greenhouses and plastic bedding on vegetables were significantly damaged by Zetas high winds. During the spring, wet conditions across portions of the Southeast disrupted the application of herbicides, fertilizers, and nutrients to fields. Wisconsin, like the region, has recorded eight straight years above normal. On August 31st, a line of slow-moving thunderstorms brought over 5 inches of rainfall to Johnston County, NC, where a 5-year-old girl and her 4-year-old brother were swept away in floodwater. Additionally, there were reports of damage to homes near Breaux Bridge, Louisiana due to strong winds, while a trailer was flipped by strong winds near Vinton, Louisiana. Drought conditions also dried up or reduced water supplies that some firefighters rely on to fight fires. Three more states had more than 2.00 inches (51 mm) above normal and another two (Illinois and Wisconsin) had more than 1.00 inch (25 mm) above normal. Elkins, West Virginia, had its snowiest May day and snowiest month of May on record, while Concord, New Hampshire, saw measurable snow in May for the first time in over 50 years. Portions of Delaware, southeastern Pennsylvania, and New Jersey also saw damaging severe thunderstorms. April was primarily cooler and wetter than normal, with every state except for Louisiana and Texas experiencing cooler than normal temperatures while every state except for Oklahoma and Texas experienced wetter than normal conditions. The calculation of days only includes the days when precipitation totalled at least one millimetre (0.04 inches). Burn bans were enacted in several locations. For more details on the January and winter-to-date climate for the United States, read the Centers' U.S. climate summary for January. In addition, Augusta, GA (18712020) observed only its second trace of snowfall on Christmas Day since records began 149 years ago. The greatest rain totals ranged from 4 to 9 inches (102 to 229 mm), with Allentown, Pennsylvania, having its wettest August day with 4.92 inches (124.97 mm) of rain. The lowest known mean sea level pressure on record in Alaska was recorded on the 31st on Shemya Island at Eareckson AFB and registered at 924.8 millibars (27.31 inches of mercury). Annual temperature departures were above normal for nearly all of the Western U.S. The summer was much more active, however, with several notable events occurring, such as the Western U.S. derecho in June and the Midwestern U.S. derecho in August, which started in the High Plains region. The Roanoke River crested almost 6 feet (1.8 meters) above flood stage on May 21st, sending water rushing onto some roadways and making them impassable. The warmth kicked off in January with Boston, Massachusetts; Providence, Rhode Island; and Bridgeport, Connecticut, having their warmest January day on record with highs near or above 70 degrees F (21 degrees C). Temperatures were near average to above average across much of the Southeast region and Puerto Rico for the month of January. Numerous daily precipitation extremes were recorded across the region during the year. Meanwhile, parts of northwestern Alaska, the Aleutians and the central Gulf regions received below-average precipitation for the year. NOAA Climate.gov map from our Data Snapshots collection, based on data from NOAA National Centers for Environmental Information. CONUS Minimum Temperature Rank is not available for June 2023. A complex storm system brought severe weather and snow to the Northeast in early April. Monthly mean temperatures were within 2 degrees F (1.1 degrees C) of average for 70 percent of the 139 long-term (i.e., period of record equaling or exceeding 50 years) stations across the region. Several tropical systems affected the Northeast this year, with Tropical Storm Fay, Tropical Storm Isaias, and Tropical Storm Zeta being particularly noteworthy. This tornado flipped a mobile home on its side, causing one injury. Boulder, Colorado: Highest seasonal snowfall total on record with 152.0 inches (386 cm) (period of record 1893-2021), Grand Forks, North Dakota: Tied for highest 1-day total precipitation of 4.26 inches (108 mm) for the month of June, June 30 (period of record 1893-2021), Casper, Wyoming: Earliest autumn snowfall on record with 2.3 inches (6 cm), September 7 (period of record 1939-2021), Cheyenne, Wyoming: Highest 1-day total snowfall of 14.0 inches (36 cm) for the month of October, October 25 (period of record 1883-2021). Mitchell, NC (19252020) recorded 0.2, 10.2, and 64.2 inches (5, 259, and 1,631 mm) of snowfall during the year, which is 17.9, 12.5, and 13.2 inches (455, 318, and 335 mm) below their long-term averages, respectively. Conditions improved in eastern New York but worsened in western New York and the western half of Pennsylvania. The average precipitation was 1.6 inches, which is 0.71 inch below average. There were no reports of hail for the month and only 18 wind reports for the month, which is 38 percent of the average (48 reports). Five of the six largest wildfires in California history also occurred during 2020. The lack of precipitation in the northern areas was also noticeable in the snow totals for that area. The southernmost parts of Florida, Texas, California, and Arizona all have annual average temperatures of at least 70 degrees, but very different rainfall amounts: 10 inches or less in the Southwest versus more than 50 inches in Florida. Five Category 4 and 5 storms formed in the Atlantic during 2020, tying with 1933, 1961, 1999 and 2005 for the record. Station Data. Vegetable and citrus growers in southern Florida had to pump excess water out of their fields due to the persistent rainfall. Soil moisture conditions in the fall and early winter are important for the High Plains region because, as soils freeze, available moisture is locked in place until spring. Issued 12 January 2021: Unless otherwise noted, temperature and precipitation rankings refer to a 126-year period of record (1895-2020), and long-term average refers to the 20th century (1901-2000) value. On the 11th, Rocky Mount-Wilson Regional Airport, NC (20002020) observed its second wettest day for any month on record, with 6.02 inches (153 mm) of precipitation. Approximately four percent of Californias nearly 100 million acres were consumed by wildfires in 2020, which is the largest wildfire season on record for the state. Monthly averages Washington Longitude: -77.0377, Latitude: 38.8521 Average weather Washington, DC - 22202. Despite a cold start to the year in Alaska, the statewide average annual temperature was 27.5F, 1.5F above the long-term average and was the coldest year since 2012. Thundersnow and snowfall rates of 2 to 3 inches (5 to 8 cm) per hour were reported in central New York, where several roads were shut down due to accidents. Several notable widespread wind events occurred in the Northeast this year. In the Hawaiian Islands, drought conditions improved on Lanai, Maui, Molokai, and Oahu according to the U.S. Drought Monitor. Wet weather continued to delay field work across North Carolina, with reports of negative impacts on the wheat crop due to waterlogged soils. A few producers were able to begin preparing fields for spring row crop planting when breaks in the rain allowed. On the 12th, Appomattox, VA (19372020) and Concord 4 SSW, VA (19502020) observed their second and third wettest day for any month on record, with 7.28 and 6.85 inches (185 and 174 mm) of precipitation, respectively. This was the first EF-4 tornado in South Carolina since 1995, and it was the second of 12 tornadoes in a tornado family that traveled over 150 miles (241 km) from Middleground, GA to Murrells Inlet, SC. Missouri was the wettest with a good portion of the state picking up more than twice the normal precipitation total for January. Texas tallied the most reports (16) while Arkansas tallied the fewest (1). Severe drought classifications developed in northwestern Mississippi, but the total area experiencing severe drought classifications decreased as conditions improved across northern, southern and central Texas as well as southwestern Oklahoma. Precipitation was above average from California to the western Great Plains and in parts of the southern Mississippi Valley, northern Great Lakes, Southeast and Northeast. Five named storms (Cristobal, Marco, Laura, Delta and Zeta) made landfall in Louisiana in 2020, which is the most on record for any state in one year. For the year, there were areas in all six states that averaged between 1 to 2 degrees F (0.56 to 1.11 degrees C) above normal, while parts of Texas, Oklahoma, Louisiana, Mississippi, and Tennessee averaged 2 to 3 degrees F (1.11 to 1.67 degrees C) above normal. Places that were wetter than average are green; places that were drier than average are brown. Meanwhile, drought decreased in Nebraska and Kansas by 5 percent and 10 percent, respectively, due to ample rain and snow in eastern areas of both states. For instance, the Perkiomen Creek at Graterford, Pennsylvania, reached 19.14 feet (5.83 m), nearly a foot (0.30 m) higher than its previous record from 1935. The total precipitation for each climate division is the average of all grid point values that fall within it. Drought severity also slightly decreased in western Iowa. This tornado destroyed a mobile home and downed several trees, while the tornado near Texas City, Texas damaged businesses and an apartment complex. Mount Washington, New Hampshire, had its highest August wind gust of 147 mph (66 m/s). Meanwhile, heavy rain and snow in eastern parts of Kansas and Nebraska set new records and helped improve or alleviate drought conditions there. There were three months (January, February, and September) where every state was wetter than normal and one month (November) where every state was drier than normal. In the Pacific Northwest, precipitation was near normal to above normal across western Oregon and Washington as well as in northeastern Washington. The count of days includes those when precipitation amounts to 0.01 inches (0.25 millimetres) or more. Atlanta, GA (18782020) received 4.55 inches (116 mm) of rainfall from Delta on the 10th, making it the second wettest October day on record. A few northern Maine farmers initiated the process to allow for emergency haying and grazing on conservation reserve. In California, back-to-back storm systems in late January provided a marked increase to the Sierra Nevada snowpack. From late August through the end of the year, the mainland portion of the Southeast region remained completely drought-free for the first time since 2004. In the Interior, Fairbanks observed only 0.5 in (12.7 mm) of snowbreaking the record (dating back to 1966) for the lowest January snowfall total. Power outages affected millions in the region with many outages lasting days or even weeks in some cases. The six Midwest states with above-normal precipitation in 2020 all exceeded their normal annual precipitation by November, and Kentucky did so in October. In fact, Utah's 7.23 inches of annual precipitation was 0.89 inches less than the previous record set in 1956. However, the drought was rapidly eliminated by beneficial rainfall from Tropical Storm Isaias at the end of July. The Four Corners region began 2020 with a sizeable area of severe drought that has expanded and intensified with exceptional drought present in Nevada, Utah, Arizona, New Mexico, and Colorado by the end of 2020. Reference NOAA National Centers for Environmental Information (NCEI). Meanwhile, Bismarck, ND had its second wettest year in 2019, followed by its third driest in 2020 (period of record 1874-2021). National Overview Issued 12 January 2021: Unless otherwise noted, temperature and precipitation rankings refer to a 126-year period of record (1895-2020), and long-term average refers to the 20th century (1901-2000) value. On January 13th, a microburst damaged a school in Sampson County, NC. The persistence of nighttime warmth was exceptional for many locations across the region, particularly in Florida. In January, the entire UK averages 15 days of rain or snow, totalling 122 millimetres (4.8 inches). In the Desert Southwest, Roswell, New Mexico reported its warmest year on record since records began in 1949 with an annual average temperature of 64.6 F (18.1 C), 3.8 F (2.1 C) above normal. Approximately 64 percent of the 168 long-term stations across the region observed annual precipitation totals that were at least 12 inches above average. The month's total precipitation is an average of weather data collected from 1991 to 2020. For example, in New Hampshire, an emergency drought law banning outdoor fires near public woods was in effect for a month, and several communities and the White Mountains National Forest had burn bans. Temperatures were below normal in the Interior, Southcentral, and Southeast regions of Alaska. The severe weather season got off to a very slow start this year, with only 10 tornado watches issued nationally during May. Providence, Rhode Island, picked up 1.6 inches (4.1 cm) of snow on October 30, tying as the sites snowiest October day on record. An atmospheric river, or a plume of concentrated moisture in the atmosphere, impacted the West Coast from January 27-29. In a break from recent years, average annual temperatures were generally above normal across the High Plains region, with widespread departures of up to 2.0 degrees F (1.1 degrees C).
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