ENSO Composites
La Niña Precipitation Composites
The plots below, which are called 'composites', show the average effect of La
Niña on precipitation. Each dot on the map represents a data station. The
color of each dot is determined by the average of the precipitations over several
La Niña events. A brown dot means below-average precipitation, a green
dot means above-average precipitation, and a grey dot means near-average precipitation.
White areas (without any dots) have few or no data stations. There is a detailed
explanation of how the plots were made at the bottom of the page.
January to March
 |
April to June
 |
July to September
|
October to December
|
 |
Detailed Explanation
- For each season (Jan to Mar, etc.), we defined La Niña years
by taking the coldest 20% of Nino3 years for that season from 1900 to 1990.
- For each season and each location we calculated the median rainfall over
all La Niña years.
- We defined precipitation terciles for each location based on the 1900-19900
period.
- We colored each dot according to which tercile the median precipitation
during La Niña years fell in.
|
