NASA released their data last week showing that the year so far is the hottest on record, and NOAA’s National Centers for Environmental Information (formerly National Climate Data Center) came out with their summary today. NASA and NOAA (along with the UK and Japan) use slightly different methods to compile the data, which is a very common method in science.

More from NOAA NCEI:

Global highlights: April 2015

• During April, the average temperature across global land and ocean surfaces was 1.33°F (0.74°C) above the 20th century average. This was the fourth highest for April in the 1880–2015 record.
• The April globally-averaged land surface temperature was 2.00°F (1.11°C) above the 20thcentury average. This was the 10th highest for April in the 1880–2015 record.
• The April globally-averaged sea surface temperature was 1.08°F (0.60°C) above the 20thcentury average. This was the highest for April in the 1880–2015 record, surpassing the previous record of 1998 by 0.05°F (0.03°C).
• The average Arctic sea ice extent for April was 310,000 square miles (5.5 percent) below the 1981–2010 average. This was the second smallest April extent since records began in 1979, according to analysis by the National Snow and Ice Data Center based on data from NOAA and NASA. This extent was 30,000 square miles larger than the record small April extent that occurred in 2007.

Global highlights: Year-to-date (January–April 2015)

During January–April, the average temperature across global land and ocean surfaces was 1.44°F (0.80°C) above the 20th century average. This was the highest for January–April in the 1880–2015 record, surpassing the previous record of 2010 by 0.13°F (0.07°C).

During January–April, the globally-averaged land surface temperature was 2.66°F (1.48°C) above the 20th century average. This was the highest for January–April in the 1880–2015 record, surpassing the previous record of 2007 by 0.05°F (0.03°C)

During January–April, the globally-averaged sea surface temperature was 0.99°F (0.55°C) above the 20th century average. This tied with 2010 as the second highest for January–April in the 1880–2015 record, trailing 1998 by 0.04°F (0.02°C).