Snowfall during moderate-to-strong El Niño winters

Mean anomaly, El Niño winters El Niño winters with below-average snowfall Single winter (use the timeline)

Ski resorts (OpenSkiMap)

Hover the map for values; click a cell for its history

ERA5 reconstruction of NOAA Climate.gov's map. JFM, detrended, vs 1991–2020.

Terms

JFM: January–March. Snowfall is summed over these three months of each winter.
mm w.e.: Millimetres of water equivalent: the depth of liquid water if the snow melted. Fresh snow is often ~10× deeper, but the ratio varies.
Anomaly: Difference from the 1991–2020 average, after removing each location's long-term linear trend.
El Niño winter: One of the 14 moderate-to-strong El Niño winters in this dataset (the blog's 13 plus 2023–24).
RONI: Relative Oceanic Niño Index (NOAA CPC): tropical Pacific sea-surface temperature anomaly relative to the tropical mean, in °C. Shown for Dec–Feb; ≥ +1.0 is roughly a moderate El Niño, ≥ +1.5 strong, ≤ −0.5 La Niña.