Climate and weather: Trends and averages

  • Data: Met Office Hadley Centre

  • Data: Met Office Hadley Centre

  • Data: Met Office Hadley Centre

  • Data: Met Office Hadley Centre

  • Data: Met Office Hadley Centre

    Trends show whether a set of measured values is increasing or decreasing over time. Calculating climate trends over short periods of time can often give misleading results, since the data are affected by measurement uncertainties and by short-term variability. That’s why scientists use averages taken over longer time periods to ensure the trends calculated are more reliable.