NCDC added Alaska climate divisions to its nClimDiv dataset on Friday, March 6, 2015, coincident with the release of the February 2015 monthly monitoring report. For more information on this data, please visit the Alaska Climate Divisions FAQ.
Maps and Graphics:
It should be emphasized that all of the temperature
and precipitation ranks and
values are based on preliminary data. The ranks will change when
the final data are processed, but will not be replaced on these
pages. Graphics based on final data are available on the Climate Monitoring Products
For graphics covering periods other than those mentioned above or
for tables of national, regional, and statewide data from
1895-present, for May, last 3 months or other periods, please go to
the Climate At A Glance
For additional details, see the Monthly
Highlights section. For details and graphics on weather
events across the U.S. and the globe go to NCDC's Global Hazards page.
- May temperatures were above normal for the contiguous United
States. Nationally, it was the fifth warmest May in the 1895-2006
record. The southwest, from Texas to California was much above
average. Near to below normal temperatures covered much of the U.S.
east of the Mississippi, except the Northeast, which experienced
above normal temperatures for the month. For information on
temperature records during the month, please go to NCDC's Extremes page.
- Precipitation was below average for the contiguous U.S. with
dryness occurring primarily in the West-Central Plains and Rocky
Mountain regions, while the northern Midwest and the Northeast
experienced above to much above normal precipitation in May. Record
rainfall resulted in extensive
flooding in New England between 10-15 May. Significant drought
continued in the Southern Plains and Desert Southwest, with
exceptional drought persisting in southernmost Texas. For more
information on drought during May, please visit the U.S. Drought page.
- Tornado producing
thunderstorms claimed three lives on 9 May in Collin Co., TX,
just northeast of Dallas. Twenty-six homes were damaged and 10
injuries also were reported.
- Tropical Storm Aletta led off the Eastern North Pacific 2006 Tropical
Cyclone Season. Aletta formed on 27 May and dissipated on the
30th, reaching maximum sustained winds of 40 kts. For statistics on
the Eastern North Pacific storm season, please see NCDC's 2006 Northeast
Pacific Tropical Cyclone page. The Atlantic season begins on 01
Monthly and Seasonal Highlights:
It should be emphasized that all of the temperature and
precipitation ranks and values
are based on preliminary data. The ranks will change when the final
data are processed, but will not be replaced on these pages.
Graphics based on final data are available on the Climate Monitoring Products
|For tables of national, regional, and
statewide data from 1895-present, for May, last 3 months or other
periods, please go to the Climate At
A Glance page.
- May 2006 was the fifth warmest
May in the 1895 to present record. The preliminary nationally
averaged temperature was 63.7°F (17.6°C), which was
2.7°F (1.5°C) above the 1901-2000 (20th century)
- May 2006 had below average
precipitation, nationally, ranking 17th driest in the 1895-2006
record. An average 2.33 inches (59 mm) fell over the contiguous
U.S. in May, 0.54 inches (14 mm) below the 1901-2000 average.
- Boreal spring (Mar-May) temperature
was much above average and ranked as the 3rd warmest such period in
the 1895-to-present record. The preliminary nationally averaged
temperature for February-April was 54.7°F (12.6°C) which
was 2.9°F (1.6°C) above the 1901-2000 mean.
- March-May had below average
precipitation, ranking it as the 31st driest spring in the last 112
years. The 7.11 inches (181 mm) average March-May precipitation for
the nation was 0.6 inches (15 mm) below the 1901-2000 average.
- The June 2005 - May 2006 temperature
was also much above average and, based upon preliminary data,
ranked as the warmest such period in the 1895-2006 record. The
preliminary nationally averaged temperature was 55.2°F
(12.9°C) which was 2.4°F (1.3°C) above the 20th
- Precipitation was near average for May-April, ranking 41st driest for the last 12
months based on a record of 111 such periods. Nationally averaged
total precipitation was 28.68 inches (728 mm), or 0.47 inch (12 mm)
below the 1901-2000 average.
Regional and Statewide: