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:
PLEASE NOTE: All 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. Once
available, graphics based on final data will be provided 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
May / Spring
For information on local temperature and precipitation records
during the month of May, please visit NCDC's Extremes page.
- For the contiguous U.S., the average temperature for May was
63.14°F (17.30°C), which was 2.08°F (1.16°C)
above the 20th century mean (based on preliminary data) and the
11th warmest May on record.
- For the spring (March-May), the average temperature for the
contiguous U.S. was 54.38°F (12.43°C), which was
2.49°F (1.38°C) above the 20th century mean (based on
preliminary data) and the 5th warmest spring on record.
- The warmth during the spring was widespread: Wyoming and
Missouri both had their third warmest spring, Illinois and Nevada
had their fourth warmest spring, and the Central and West North
Central regions were 5th warmest on record for spring.
- The majority of the contiguous U.S. was warmer than average in
May, with only two states cooler than average for the month (Texas
and South Carolina).
- For May, the average precipitation for the contiguous U.S. was
2.65 in (67.31 mm), which was 0.22 in (5.67 mm) below the 20th
century mean (based on preliminary data) and the 42nd driest on
- May was unusually dry in a number of areas: Georgia was driest
for the month, Ohio and Alabama had their 3rd driest, and the
Southeast region also had its 3rd driest May. Parts of the
Southwest and High Plains were wetter than average in May, with
Texas, New Mexico, North Dakota, and South Dakota all much
wetter-than-average for the month.
- The average precipitation for the contiguous U.S. for spring
was 6.91 in (175.51 mm), which was 0.80 in (20.24 mm) below the
20th century mean and the 23rd driest on record.
- Tennessee, Mississippi, Alabama, and Georgia had their driest
spring on record. On the regional scale, the central third of the
U.S. was wetter or much wetter-than-average, while the Southeast
region was driest on record for the spring.
- The dry conditions across the Southeast exacerbated wildfire
activity in May, which continued to be focused across Florida and
southern Georgia. Severe-to-extreme drought conditions were felt
across the Southeast, with extreme drought spreading across parts
of Alabama, Mississippi, Georgia, Tennessee, Florida, and North
Carolina. Please see the 2007 Fire
Season page for more information.
- The past six months (Dec-May) were the driest on record for the
- For the past 12 months, the Western region (California and
Nevada) had its driest June - May on record. The abnormally dry
conditions have led to severe-to-extreme drought from the southern
California coast to Arizona and north along the Sierra Nevada
Mountains in the Great Basin. Additional information on drought
conditions is available here.
For additional details, see the Monthly and
Seasonal Highlights section below and visit the May Climate Summary page. For details and
graphics on weather events across the U.S. and the globe
please visit NCDC's Global Hazards
- Across the United States, extreme drought conditions were
observed in areas of Wyoming, as well as northern Minnesota and
throughout much of the Desert Southwest and the Southeast region.
For more information on drought during May, please visit the
U.S. Drought page.
- El Niño-Southern Oscillation (ENSO) conditions are in a
neutral state. Sea-surface temperatures (SST) anomalies remain
near-zero in the central equatorial Pacific and below average
across the eastern equatorial Pacific in May. Current forecasts
indicate that a transition from ENSO-neutral conditions to La
Niña could occur over the next 1-3 months. For additional
information on ENSO conditions, please visit the NCDC ENSO Monitoring page and the
NOAA ENSO Advisory.
Monthly and Seasonal Highlights:
|For additional national, regional, and
statewide data and graphics from 1895-present, for May, the last 3
months or other periods, please visit the Climate At A Glance page.
- May Temperature: 11th
warmest May in the 1895-2007 record. The preliminary
nationally averaged temperature was 63.14°F (17.30°C),
which was 2.08°F (1.16°C) above the 1901-2000 (20th
- May Precipitation: 42nd
driest nationally in the 1895-2007 record. An average of 2.65
inches (67 mm) fell over the contiguous U.S. in May, 0.22 inches (6
mm) below the 20th century mean for the month.
- March - May Temperature
(3-Month): 5th warmest in the 1895-to-present record,
2.49°F (1.38°C) above the 20th century mean. The
preliminary nationally averaged March - May temperature was
- March - May Precipitation
(3-month): A total of 6.91 inches (176 mm) of precipitation
fell during this 3-month period, which corresponds to a ranking of
- December - May (6-month): The
national average temperature was the 12th warmest for this 6-month
period. The nationally-averaged temperature was 44.13°F
(6.74°C), which was 1.68°F (0.93°C) above the 20th
century mean. At 13.19 inches (335 mm), December - May
precipitation was below average and ranked as the 34th driest such
period in the 1895-2007 record.
- January to May
(Year-to-date): The 20th warmest January - May on record. The
nationally averaged year-to-date temperature was 45.57°F
(7.54°C), or 1.33°F (0.74°C) above the mean. The
year-to-date period was the 14th driest January - May in the
113-year record, receiving a national average of 10.66 inches (271
mm) of precipitation during the period, or 1.29 inches (33 mm)
below the 20th century mean.
- June 2006 - May 2007: The
10th warmest such period in the 1895-2007 record. The
preliminary nationally-averaged annual temperature was 54.12°F
(12.29°C), which was 1.30°F (0.72°C) above the mean.
Precipitation for the June 2006 - May 2007 period ranked as the
58th driest June to May in the 112-year record. The
nationally-averaged annual precipitation accumulation was 29.14
inches (740 mm), ranking near the 20th century mean.
had its 16th warmest May since 1918 on record, with a temperature
1.40°F (0.78°C) above the 1971-2000 average.
tied for its 38th coldest spring (March - May) on record, with a
temperature 1.73°F (0.96°C) below the 1971-2000
Other Statewide and Regional
- May temperatures were
much above average for four states, including Illinois
which ranked 7th and 9th warmest, respectively. Texas
ranked 26th coldest. Precipitation across Georgia
was driest on record. Alabama
were 3rd driest and North
Dakota was 6th wettest on record.
- March - May temperatures
ranked 3rd warmest on record. Illinois
were 4th warmest.
was the only state with below average temperatures for
the period. Alabama,
ranked driest for the March - May period. Nebraska
was 3rd wettest.
- The Southeast region, ranked
driest for the March - May period with a value of 5.88 inches (149
mm). The previous record dry spring was March - May 1914, with a
total of 6.77 inches (175 mm).
- Temperatures over the past 6-months (December - May) were above
average in all regions except the South, which was near average.
Precipitation for the period was driest in the Southeast.
- December - May temperatures
were much above average for six states, including Wisconsin
was the only state with below average temperatures during the six
month period. Mississippi
ranked driest for the period, while Nebraska
experienced its wettest such period on record.
- During the year-to-date period
(January - May), temperatures were near average to above
average in all states except Texas
ranked driest for the period.
- January - May
precipitation across the Southeast
was record driest.
- June 2006 - May 2007 was near
average to much-warmer-than-average for the lower 48 states. Seven
states, including Florida,
ranked much below average for precipitation. New
Hampshire was 2nd wettest for the period.
See NCDC's Monthly
Extremes web-page for weather and climate records for the month
PLEASE NOTE: 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
Citing This Report
NOAA National Centers for Environmental Information, State of the Climate: National Overview for May 2007, published online June 2007, retrieved on July 6, 2015 from http://www.ncdc.noaa.gov/sotc/national/200705.