Climate oscillation
![Climate change over the past 65 million years, using proxy data including Oxygen-18 ratios from foraminifera.](/Images/godic/202501/05/65_Myr_Climate_Change3349.png")
![Temperature change over the past 12 000 years, from various sources. The thick black curve is an average.](/Images/godic/202501/05/Holocene_Temperature_Variations3349.png")
A climate oscillation or climate cycle is any recurring cyclical oscillation within global or regional climate, and is a type of climate pattern. These fluctuations in atmospheric temperature, sea surface temperature, precipitation or other parameters can be quasi-periodic, often occurring on inter-annual, multi-annual, decadal, multidecadal, century-wide, millennial or longer timescales. They are not perfectly periodic and a Fourier analysis of the data does not give a sharp spectrum.