The planet has set another monthly climate record, with scientists in the US recording the hottest June in 135 years.

The first six months of the year also set a record for warmth, according to the monthly report by the National Oceanic and Atmospheric Administration (NOAA), released on Monday.

"The globally averaged temperature over land and ocean surfaces for June 2015 was the highest for the month of June since record keeping began in 1880," said NOAA's National Centers for Environmental Information.

"The June average temperature across global land and ocean surfaces was 1.58 Fahrenheit (0.88C) above the 20th century average."

The previous high for the month of June was set in 2014, NOAA said.

For the first six months of the year, 2015 beat 2010 for the hottest on record.

"The year-to-date temperature across global land and ocean surfaces was 1.53 Fahrenheit (0.85C) above the 20th century average. This was the highest for January-June in the 1880-2015 record," said NOAA.