<P> The global temperature record shows the fluctuations of the temperature of the atmosphere and the oceans through various spans of time . The most detailed information exists since 1850 , when methodical thermometer - based records began . There are numerous estimates of temperatures since the end of the Pleistocene glaciation , particularly during the current Holocene epoch . Older time periods are studied by paleoclimatology . </P>
<P> The global temperature record shows the fluctuations of the temperature of the atmosphere and the oceans through various spans of time . The most detailed information exists since 1850 , when methodical thermometer - based records began . There are numerous estimates of temperatures since the end of the Pleistocene glaciation , particularly during the current Holocene epoch . Older time periods are studied by paleoclimatology . </P>
how long have we been keeping weather records
how long have we been keeping weather records
1850
1850