README.md

In rmet: Download and Read Brazilian Meteorological Data from INMET

rmet

rmet downloads and parses historical hourly weather data published by Brazil's National Institute of Meteorology (INMET). It handles format changes across years, inconsistent encodings and column names, interrupted downloads, and local caching.

Installation

Install the released version from CRAN:

install.packages("rmet")

Install the development version from GitHub:

# install.packages("pak")
pak::pak("rodrigosqrt3/rmet")

Quick start

The recommended interface downloads missing archives, reuses valid cached files, and reads the requested data:

library(rmet)

weather <- inmet_get(
  years = 2023:2025,
  stations = "A801",
  variables = c("temp_dry_c", "precip_mm", "humid_rel_pct")
)

Timestamps are returned in UTC by default because the historical source files use UTC. Convert their display explicitly when needed:

weather_sp <- inmet_get(2025, stations = "A801", tz = "America/Sao_Paulo")

Find stations

inmet_stations() obtains the current official automatic-station catalogue, caches it locally, refreshes it periodically, and falls back to a cached or bundled catalogue when offline.

stations <- inmet_stations(state = "RS", status = "Operante")
stations[, c("station_code", "station_name", "status", "start_date")]

# Force a catalogue update
stations <- inmet_stations(refresh = TRUE)

The catalogue can also be filtered by region, state, station name or code, operational status, and provider entity.

Lower-level workflow

inmet_download(2024:2025)
inmet_cache_status()

weather <- inmet_read(
  years = 2024:2025,
  stations = c("A801", "A802"),
  start_date = "2024-06-01",
  end_date = "2024-08-31"
)

| Function | Purpose | |---|---| | inmet_get() | Download and read data in one call. | | inmet_download() | Reliably download and cache annual ZIP archives. | | inmet_read() | Parse cached archives into consistent data frames. | | inmet_extract() | Extract original CSV files. | | inmet_stations() | Search the current official station catalogue. | | inmet_cache_status() | Inspect complete and partial cached downloads. | | inmet_cache_clear() | Remove cached archives and catalogue data. |

Data quality

INMET describes automatic-station observations as raw data that have not undergone consistency validation. rmet standardizes structure and missing values but does not certify that measurements are meteorologically plausible. Users should apply quality-control rules appropriate to their analysis.

Data source and license

Data are retrieved from INMET and are not redistributed by rmet. Package code is licensed under GPL (>= 3).

Please report reproducible problems through the package's GitHub issue tracker.

rmet documentation built on Sept. 21, 2026, 5:08 p.m.