Cumulus MX

Cumulus MX 5.1.6

The Cumulus MX weather program

  • By Cumulus MX
  • Open Source
  • Updated Sep 17, 2026
Download for Windows

About Cumulus MX

The Cumulus MX weather program

What's new in 5.1.6

New

  • Adds support for the latest European Environment Agency - European Air Quality Index (EEA - EAQI)
  • Note this is for pm2.5 and pm10 only, and should really use a 1-hour average PM value. This 1-hour average is only available from the AirLink

Changed

  • The Alternative Interface has been updated to the latest version
  • The upload.php script has been updated to avoid future deprecation issues
  • Third Party Custom HTTP uploads have had a make-over
  • All can now be configured for both GET or POST
  • The Custom Seconds and Custom Minutes can now have the interval defined per upload
  • The Davis VP2 console allowed clock drift reduced from 30 to 15 seconds
  • Optimise the loading of Ecowitt SD card files during catch-up
  • Add delay in Linux service installer before performing systemctl reload

Fixed

  • Missing PM10 values on the charts for some AQ sensor types
  • FTP Exception on connection failure
  • Startup PING hanging up the application
  • Davis VP2 catch-up will no longer process archive records that are timestamped later than the current time
  • HTTP Files direct download to upload of files via FTP
  • Fix Davis VP2 THSW index == 255 when reception is lost

Package Updates

  • BouncyCastle.Cryptography
  • FluentFTP
  • Microsoft.Win32.SystemEvents
  • MySqlConnector
  • SQLitePCLRaw.bundle_e_sqlite3
  • SSH.NET
  • System.CodeDom
  • System.IO.Ports
  • System.ServiceProcess.ServiceController

Full release notes »

Technical details

PublisherCumulus MX
Version5.1.6
Release date2026-09-17
LicenseGPL-3.0
Installer typezip
Architecturex86
Package IDCumulusMX.CumulusMX

Links & install command

Install Cumulus MX from the command line with Windows Package Manager (winget):

winget install --id=CumulusMX.CumulusMX -e

Older versions

  • 5.1.5
  • 5.1.4
  • 5.1.3
  • 5.1.1
  • 5.1.0
  • 5.0.1
  • 5.0.0
  • 4.6.4
  • 4.6.3