Hottest June on Record, Says National Climatic Data Center

Temperature Trend The National Climatic Data
Center at the National Oceanic and Atmospheric Administration has
released its global average temperature figures for June 2014. The
NCDC reports:

The combined average temperature over global land and ocean
surfaces for June 2014 was the highest on record for the month, at
0.72°C (1.30°F) above the 20^th century average of 15.5°C
(59.9°F).
The global land surface temperature was 0.95°C (1.71°F) above
the 20^th century average of 13.3°C (55.9°F), the seventh
highest for June on record.
For the ocean, the June global sea surface temperature was
0.64°C (1.15°F) above the 20^th century average of 16.4°C
(61.5°F), the highest for June on record and the highest departure
from average for any month.
The combined global land and ocean average surface temperature
for the January–June period (year-to-date) was 0.67°C (1.21°F)
above the 20^th century average of 13.5°C (56.3°F), tying
with 2002 as the third warmest such period on record.

This is in contrast with the global temperature trends reported
by University of Alabama in Huntsville climatologists John Christy
and Roy Spencer who find that
June 2014 was the fourth warmest in the satellite record. They
note:

The global average temperature for June was 0.30 C (about 0.54
degrees Fahrenheit) warmer than seasonal norms for the month, warm
enough to tie June 2013 for fourth warmest. (The warmest June was
in 1998, during the “El Niño of the century.” Global average
temperatures in June 1998 were 0.51 C [about 0.92 degrees F] warmer
than normal.)

Below is a comparison of global temperature trends through May
2014 between the two satellite datasets (UAH and RSS) and the three
leading surface datasets including the NCDC one.

Temperature Comparison