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Assessing the U.S. Climate in April 2021

April was dry and mild across much of the contiguous U.S.; Preliminary data suggest April had the fewest tornadoes in almost three decades

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During April, the average temperature of the contiguous United States was 51.9°F, 0.9°F above the 20th-century average. This ranked in the middle third of the 127-year period of record. The year-to-date (January-April) average contiguous U.S. temperature was 40.7°F, 1.6°F above average, ranking in the warmest third of the record. The April precipitation total for the contiguous U.S. was 2.03 inches, 0.49 inch below average, and ranked as the 14th-driest April in the 127-year period of record. This was the driest April since 1989. The year-to-date precipitation total was 8.63 inches, 0.85 inch below average and ranked in the driest third of the January-April record.

The preliminary count of 73 tornadoes reported in April was the lowest April total since 53 tornadoes were reported in 1992 and was also nearly half of the April 1991-2010 average of 155 tornadoes.

April 2021 US Significant Climate Events Map

 

This monthly summary from NOAA National Centers for Environmental Information is part of the suite of climate services NOAA provides to government, business, academia and the public to support informed decision-making.

April

Temperature

 

April 2021 US Average Temperature Percentiles Map

 

  • Temperatures were above average across much of the West Coast, Southwest, Northeast, Great Lakes and parts of southern Texas and Florida. Maine ranked fifth warmest on record for April.
  • A large portion of the southern Plains and Gulf Coast states experienced below-average temperatures, as did portions of the northern and central Rockies, northern and central Plains and the Tennessee Valley.
  • The Alaska April temperature was 23.6°F, 0.3°F above the long-term average, ranking in the middle third of the 97-year period of record. In general, the interior portions of the state were cooler than average, while the Aleutians experienced above-average temperatures for the month. 
    • Despite the mild average, large temperature swings were seen throughout the month as records were set for both coldest temperatures seen so late and warmest temperatures seen so early in the season across portions of Alaska.
  • Bering Sea ice cover for April was 80 percent of average and the highest for April since 2016.
April 2021 US Mean Temperature Departures from Average Map

 

Precipitation

April 2021 US Total Precipitation Map

 

  • A majority of the Lower 48 experienced below-average precipitation during April with four states across the West ranking among their 10-driest Aprils on record. Oregon ranked third driest while California ranked fifth driest on record for April. Precipitation was above average across portions of the northwest Great Lakes, New England, Midwest, southern Plains and Gulf Coast. 
  • April is climatologically either the driest or second-driest month of the year across Alaska. For April 2021, precipitation received was above average for the state as a whole. Fairbanks saw significant April snowfall with more than 16 inches reported for the month — its second-highest April total on record.
  • According to the April 27 U.S. Drought Monitor report, 48.4 percent of the contiguous U.S. was in drought, up nearly 4.5 percent since the end of March. Drought conditions intensified and/or expanded across the eastern Great Lakes, Northeast, northern Rockies, northern Plains and the West Coast. Drought intensity and/or severity lessened across portions of the Upper Mississippi Valley, southern Plains and central Rockies.
April 2021 US Precipitation Percent of Average Map

 

Year-to-date (January-April)

Temperature

January-April 2021 US Average Temperature Percentiles Map

 

  • Temperatures were above average over much of the West, northern Plains, Great Lakes, Northeast and Southeast. Maine ranked fifth warmest on record for the first four months of the year. Below-average temperatures were primarily found across portions of the southern Plains.
  • The Alaska January-April temperature was 11.1°F, 0.8°F above the long-term average and ranked in the middle third of the record. Temperatures were below average across portions of the Southeast Interior, Northeast Gulf and Cook Inlet regions and above average over much of the Bristol Bay and Aleutian regions. 

Precipitation

January-April 2021 US Mean Temperature Departures from Average Map

 

  • Below-average precipitation extended from the West Coast to the northern Plains and from the southwestern Great Lakes to the Northeast, and across southern Texas. North Dakota ranked driest for this four-month period while Montana and Connecticut ranked seventh and ninth driest, respectively. Above-average precipitation was limited to portions of the central Plains, northwest Great Lakes, central Gulf Coast and parts of the Southeast. 
  • Precipitation across Alaska for the January-April period ranked in the wettest third of the 97-year record. 
January-April 2021 US Precipitation Percent of Average Map

For more detailed climate information, check out our comprehensive April 2021 U.S. Climate report scheduled for release on May 12, 2021.

 

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