FRZ · Climatology

Frost / freeze

Monthly frost-month climatology · v1.1.1 · 2026-07

Europe — Alpine altitude band against the Mediterranean

How often freezing conditions occur through the year, from 30 years of ERA5 climate reanalysis.

What ships

Surfaces — 0–1 susceptibility derived from frost-month frequency per year. Full-resolution (GSHHG-f) coastline: barrier islands now scored.

Every release: 0–1 score · 5-class band · per-pixel uncertainty · input-coverage mask · STAC item · methodology doc.

Inputs

ERA5 monthly t2m 1991–2020

Version history

What changed between releases — the same notes that ship with the data. Newest first.

v1.1.1

2026-07

current

Full-resolution (GSHHG-f) coastline. All four layers are re-clipped against the canonical GSHHG-f full-resolution shoreline (~100 m native) as the last step before re-encoding, so barrier islands and narrow coastal strips now carry a score instead of NoData (e.g. the Carolinas barrier islands — Wrightsville Beach, Oak Island, Cape Hatteras). Model, inputs, and normalisation are unchanged from v1.1 — values differ only along coastlines; matched-coordinate inland pixels are identical.

v1.1

2026-04

Compact uint16 encoding. The surfaces were re-encoded from float32 to compact integer COGs with a documented scale (physical = raw × scale, nodata 65535) — smaller and self-describing, with no loss of precision at the delivered resolution. Method and values are unchanged from v1.0.

v1.0

2026-04

Initial release. A climatology (not a return-period fit): susceptibility derived from the mean number of frost months per year, counted from 30 years of ERA5 monthly minimum temperature (mn2t, 1991–2020), where a month with a below-0 °C monthly minimum counts as a frost month. The 0–12 months/year field is ranked to a 0–1 percentile scale, with a five-class map (Very Low no/rare frost → Very High year-round frost), plus per-pixel uncertainty and coverage.