weather-cli-era5 2026.1.20

CLI to download a 10-years weather data from ERA5 and process it in reports

sharve-era5-request

CLI for downloading ERA5 single-level data and generating reports.

Install

Install with pip

pip install weather-cli-era5

Local installation from the repository

pip install .

Or for local installation in editable mode (for development):

pip install -e .

Register for the ERA5 to get an API token

1. If you do not have an account yet, please register https://cds.climate.copernicus.eu/
2. If you are not logged in, please login
3. Open your profile and copy API key

Configure (one time only)

weather configure --token paste_your_api_key_token

Additional config (if needed)

# Configure token (CDS or ADS)
weather configure --token <UID:APIKEY> [--url https://ads.atmosphere.copernicus.eu/api]

Usage

Workflow overview:

• weather download: fetch 2016-2025 ERA5-Land point time-series (fixed variable set) for one location, with optional automatic geocoding.
• weather save: write the processed time-series for a location (from cache) to CSV.
• weather report: generate an HTML report for one location or an aggregated report across multiple locations.
• weather list: list cached locations (names/country/coords from the database).
• weather refresh-database: rebuild the SQLite cache from all downloaded datasets.

Commands

Download fixed variables for a point (2016-2025)

weather download --name Gothenburg --lat 57.7 --lon 11.9

Notes: downloads ERA5-Land time-series for the fixed variables into .weather_era5/gothenburg.zip (zip archive containing CSV files). If the file exists, download is skipped.

Download with automatic geocoding

weather download --name Gothenburg --find-city Gothenburg --find-country Sweden

This uses Nominatim to resolve latitude/longitude and country code; you can also provide --find-city alone and let reverse geocoding pick the country.

Save point data to CSV

weather save --name Gothenburg --output ./gothenburg.csv

This reads the downloaded point dataset for the location and writes a CSV with all variables aligned on time.

Generate a report

weather report --name Gothenburg

Produces an HTML report with one summary table for all variables and per-variable histogram and climatology line plots.

Generate an aggregated report across cities (weighted)

weather report --name "Gothenburg,Oslo" --weights "2,1"

Loads each city from the cache, aggregates metrics with provided weights (defaults to equal weights), and writes a combined HTML report.

List cached locations

weather list

Shows name (from the database, falling back to filename if missing), country, and coordinates for cached datasets.

Refresh the cache database

weather refresh-database

Reprocesses all downloaded ZIP/CSV files into the SQLite cache (useful after schema changes or manual file edits).

Options (common)

• --name: label used for the dataset filename (<name>.zip) and cache key
• --lat, --lon: latitude/longitude for downloads
• --output: optional output path for save; defaults to .weather_era5/<name>.csv

Notes

• A download for a specific location takes approximately 30s
• Datasets are stored in .weather_era5/ under your home directory by default; a SQLite cache (weather.sqlite) powers report, save, and list.
• save and report read only from the cache; run download (or refresh-database if you already have ZIP/CSV files) first.