Friday, July 2, 2010

More June Monthly Heat Records Set
All-Time Warmest Month in Miami

July 9 Update: This was also the warmest June on record at Norfolk, Virginia. The average temperature of 80.3° broke the old record of 80.1° in 1943.

July 3 Update: The June heat records keep rolling in, from the Mid Atlantic through the Southeast:

New Jersey
The Atlantic City June average temperature of 75.8° broke the old record of 74.9° set in 2008. The number of days with 90° or higher temperatures was 14, which broke the June record of 11 in 1991. Atlantic City records began in 1874.

The June average temperature of 75.4° in Trenton was the second warmest on record, just 0.1° less than the 75.5° in 1943. The 10 days with temperatures of at least 90° was just one less than the record in 1925 and 1943. Trenton records began in 1893.

The average temperature of 78.2° in Philadelphia broke the old record of 78.0° in 1925 and 1994. The 15 days with temperatures of at least 90° tied the record set in 1943. Philadelphia records began in 1872.

South Carolina
June 2010 was the warmest on record at the Charleston airport (83.4°) and the third warmest in downtown Charleston (83.3°). At the airport, 25 days were at 90° or above, including the last 21 consecutive days of the month. Downtown temperatures were 90° or above on 14 days. Airport observations date back to 1938, and downtown records began in 1870.

The Greenville-Spartanburg average of 80.8° in June was the second warmest on record, behind the 82.2° in 1952. This was only the 4th time since records began in 1893 that temperatures there have averaged 80° or higher in June.

The average temperature of 83.7° at Columbia tied the record of June 1952. Columbia records began in 1887.

June temperatures were the second warmest on record at Savannah. The average of 83.6° was tied with June 1952. There were 25 days with temperatures of 90° or above, including 20 consecutive days from the 10th through the 29th. Savannah records began in 1870.

The June average temperature of 83.8° at Tallahassee was tied with 1952 as the second warmest June on record. There were 25 days with temperatures of 90° or above.

The second warmest June at Tampa (84.8° vs. 85.5° in 1998) combined with the 4th warmest May (80.9°) to produce the warmest May-June in history (82.8° vs. the old record of 82.3° in 1998). Tampa records began in 1890.

St. Petersburg had its warmest June (86.5° vs. 84.9° in 1998) following its warmest May (82.0° vs. 81.3° in 1995) to produce its warmest May-June by a wide margin (84.2° vs. 82.0° in 1935). St. Petersburg records began in 1914.

The June average of 84.8° at Lakeland broke the record of 84.5° in 1998. This combined with the 4th warmest May (80.6°) to result in the warmest May-June on record (82.7° vs. 82.5° in 1995). Lakeland records began in 1915.

Sarasota combined its second warmest June (83.5° vs. 83.9° in 1998) with its 3rd warmest May (79.6°) for its record warmest May-June (81.5° vs. 81.2° in 1998). Sarasota records began in 1911.

Ft. Myers had its second warmest June (85.3° vs. 85.9° in 1981) and its second warmest May (81.2° vs. 82.0° in 1995). This resulted in its record warmest May-June (83.2° vs. 82.5° in 1981). Records began at Ft. Myers in 1902.

Key West's average temperature of 85.9° broke the old June record of 85.4° set in 1886. There were 14 daily records broken during the month; 13 of those were record warm minimum temperatures. Key West records began in 1871.

Evening Update: Here are more June monthly high temperature records:

North Carolina
Raleigh average of 81.5° broke 2008 record of 80.7°.
Remainder of top 5 June temperatures since 1887:

80.4 degrees in June 1943
80.0 degrees in June 1952
79.2 degrees in June 1939

There were 22 days with temperatures of 90° or higher, second only to June 1952 with 23 (normal is 10).

Greensboro average of 79.8° broke 1952 record of 79.0°.
Remainder of top 5 June temperatures since 1928:

78.8 degrees in June 2008
78.2 degrees in June 1943
77.8 degrees in June 1981

There were 17 days with max temperatures of 90° or higher, second only to June 1944 and 1952 with 20 (normal is 8).

Original post:
Washington, DC was far from alone in experiencing record heat for the month of June.

In Richmond, the monthly average of 81.1° was 7.6° above normal and nearly 2° above the old record of 79.2° in 1943. The difference between the new and old records is greater than the difference between the old record and the current 11th warmest June. This June was warm enough to be tied with the 10th warmest July. The last 3 consecutive months have now been in the top 10: April (4th warmest), May (8th warmest), and June (top warmest). The spring average (March/April/May) was also the warmest on record. Richmond temperature records began in 1880.

The National Weather Service reports that 3 out of the 4 primary climate reporting stations in south Florida (Miami, Ft. Lauderdale, and Naples) had their warmest June on record. In Miami, the average of 85.6° was the warmest for any calendar month in history. The low temperature failed to go below 80° for 13 days in June, breaking the old record of 12 in 1998. The previous month was also the warmest May on record.

Ft. Lauderdale's average of 84.9° was a new June record, and the 15 days with lows of 80° or higher broke the old record of 12 in 2008.

The Naples average of 84.6° broke the old record from 1944 by 0.5°.

The Palm Beach average of 84.4° was the second warmest June, missing the 1998 record by only 0.1°. The 10 days with lows of 80° or above broke the old record of 8 in 1981.

Central North Carolina also set June records; details later.

Image (click to enlarge): Total number of daily high and low temperature records set in the U.S. for spring 2010 (March-April-May) and June 2010, data from NOAA National Climatic Data Center, background image © Kevin Ambrose. Includes historical daily observations archived in NCDC's Cooperative Summary of the Day data set and preliminary reports from Cooperative Observers and First Order National Weather Service stations. All stations have a Period of Record of at least 30 years.

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