November 2015

Globally speaking, November was a warm month, at least for a November. GISTEMP, NOAAGlobalTemp and HadCRUT4 all have November as the warmest November on record nominally. Part of the warmth, at least the part that distinguishes it form 2014, say, is likely due to the El Nino that matured mid-year. There are various estimates of the effect that El Nino has on monthly temperatures (directly because the El Nino region is rather large and part of the surface and indirectly because El Nino warms other areas with some lag) but are around a tenth of a degree or so. Continue reading

December 2015

December 2015 was the last month of 2015. It had 31 days. December was also an unusually warm December, globally. The temperature anomaly in December was the highest recorded by some margin. In the NOAAGlobalTemp analysis the margin was 0.29degC. In HadCRUT4, it was around 0.31degC. Uncertainties in monthly values are typically larger than they are for annual values, but even so, the margin is significant in so far as the 95% uncertainty ranges for this December and the previous record holder don’t overlap. Continue reading

Drifting buoys and Argo floats are not the same thing

A drifting buoy drifts around at the surface of the ocean. Most measure pressure, sea-surface temperature and, by their changing position, ocean currents:

An Argo float drifts around at depth (usually 1000m), periodically diving down to 2000m and then rising up to the surface measuring temperature and salinity profiles as they go. They then sink back to 1000m and wait till the next cycle, which typically has a 10-day repeat.

March 2015

El Nino conditions continued to develop through March and into April. NOAA declared an ‘official’ El Nino, but the Bureau of Meteorology as of the time of writing (25 April) had not. The sea surface temperatures are indicative of a weak El Nino and the atmospheric part of the ENSO cycle has become more prominent unlike last year’s El Ninito. Continue reading

February 2015

Over land areas, February 2015 was unusually warm across most land areas with the largest anomalies over Asia and the western half of north America. Across Russia, from Karelia to Kamchatka and from Tiksi to Sochi new daily and monthly temperature records were set (–2015). In contrast, the eastern half of north America was unusually cold. Areas of north Africa and southwest Europe, Greenland, Antarctica, and small areas of southern Africa and South America were also cooler than average. Continue reading

January 2015

This is based on preliminary information from diverse sources. Caveat lector.

January 2015 was warmer than average1 across South America, the northwest of North America and large areas of Eurasia, including China where it was the warmest January on record. Colder than average conditions were observed across the northern half of Africa, Mexico and the eastern side of the US and Canada. The Iberian Peninsula, India, parts of Australia and an area on the north coast of Russia were colder than average. map  Continue reading