Global Temperature Anomaly, Trailing 365-Day Mean (ERA5) · °C

## What this measures

The average of the latest 365 daily global temperature anomalies (each day against its 1991–2020 average, Copernicus ERA5), in degrees Celsius: a Palanor calculation, written only where all 365 days are present. 30 December 1940 to 17 October 2026.

## Why it matters

A rolling year removes the seasons and most of the day-to-day weather, so it moves like an annual average that updates every day.

## How to read it

The latest value is 0.63 °C above the 1991–2020 average; the highest in this record is 0.76 °C (the year to 30 June 2024).

## What it does not say

A rolling mean lags turning points by about six months. It is against 1991–2020, not pre-industrial temperatures. The last few days are preliminary.

## Source

Palanor calculation (src/lib/climate/era5-pulse.ts) from Copernicus Climate Change Service (C3S) / ECMWF, Climate Pulse, ERA5 daily global series: https://pulse.climate.copernicus.eu (file https://sites.ecmwf.int/data/climatepulse/data/series/era5_daily_series_2t_global.csv). Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence to Use Copernicus Products (version 1.2), §4.2: "Access to Copernicus Products is given for any purpose in so far as it is lawful". Read daily by /api/cron/climate-pulse-sync.