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Welcome to the Cumulus Wiki, this community Wiki is for sharing knowledge of the Cumulus Weather Station software. This Wiki was originated to document the (original) Cumulus (1) software Steve Loft developed. The vast majority of the original content used Steve's own words, and he was a key contributor.

Other contributors reviewed what Steve said in answers in the support forum, and collated that material into pages in this Wiki, so Steve's knowledge could be shared more systematically. When Steve Loft developed other flavours, the content here also covered those. This Wiki retains content for the legacy original Cumulus software that people still use, some of that legacy content has been locked against further editing. Steve Loft deleted the material on Cumulus 2 when he abandoned that development, but his MX 3.0.0 beta documentation remains. This copy of the original Cumulus Wiki was cloned on 26-Oct-2018, just before Steve Loft ended his association with Cumulus, and all user credentials from the deleted original Wiki hosted by should be valid here.

There is limited support available for the legacy software and any remaining legacy users are encouraged to Migrate from Cumulus 1 to the vastly different Cumulus MX. A number of developers are contributing to MX, but the big transformation (from Steve's original) has been almost entirely developed by Mark Crossley.

You do not need a userid to READ any of the content on this Wiki.

If you are new to Wiki's we suggest you spend a few minutes reading basic articles about this Wiki. Familiarise yourself with:

Please see the bottom of this page for how you can contribute to this Wiki. If you plan on CONTRIBUTING to the Wiki, then you will need a account with userid.

The quickest way to get a new account is to put a request via the support forum (see pink background text there)
When requesting a Wiki account, please quote the user name you use on the Cumulus support forum, or provide other evidence of you being a genuine Cumulus user.
Otherwise use the Request Account form to apply for a userid, use the biography box to explain what you will contribute if you are granted write access, not to describe your past  (you may have to wait some time for an administrator to have spare time to wade through loads of spam requests to find any real Cumulus user request).
Do be aware there are many spammers attempting to gain access, and any request that does not comply with above instruction makes it impossible for the admins to identify genuine account requests from spammers.  
(Please note, the support forum and this Wiki are hosted by different people, on different web hosts, so do use a different password!)

Brian Underdown (weather34) has allowed us to host his Home Weather Station template for Cumulus on the Wiki.

If you have any questions please raise them on either the Cumulus forum or Cumulus board at

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Cumulus MX (V.3)
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Legacy Cumulus (V.1)
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Web Server:

Shared by Third Parties:

Please help

It's your Wiki......

We always welcome contributions from the Cumulus Community and if you feel you can contribute, please do.
If you already have a userid, then just Login here (link also available on top right of any page).
  • Are you willing to contribute to this Wiki's documentation?
  • Are you new to Cumulus MX? If so, you are the best possible person to know what newcomers need in this Wiki. You also know what you have discovered, and can document it to be useful for others.
  1. As a starting point, we suggest you read How to Edit,
    • that is full of hints on how to write Wiki pages,
    • including Cumulus Wiki specific help.
  2. If you
    • want a suggestion to start you off ...
    • or want to make a suggestion ...
      • ... How_you_can_contribute is the page you should go to, its content should be updated when work done, or suggestions need to be recorded.
  • This Main Page (only administrators can update this page) was redesigned in January 2021, the biggest changes were
    1. It provides direct links to a new set of category pages, Anyone can edit any of the new, and amended, "category" pages, those are now the entry points grouping the rest of the documentation in this Wiki.
    2. The pages specific to MX and specific to legacy software are now in separate columns
    3. This main page does provide direct links to key pages that are unlikely to be renamed/removed, but administrators have limited time to edit such links.

  • The old Fine Offset stations were long ago documented in some pages linked from Category:StationSpecific
  • There is minimal documentation for Davis stations and Instromet stations, can you rectify this?
  • There is no documentation yet for the newer Ecowitt devices, can you rectify this?
  • This Wiki documents the legacy Cumulus 1 in good detail due to many different contributors
  • Steve Loft, and Mark Crossley, (plus others), modified some legacy pages to also cover the original MX 3.0.0 beta, but that had very limited functionality (just a subset of that available in Cumulus 1) and only 2 new pages were added.
  • Most pages that are specific to legacy Cumulus 1 have been locked, to prevent editing for MX differences and to ensure they are preserved for those still using the legacy software (all pages relating to Cumulus 2 were removed by Steve Loft)
  • The MX of today, thanks to Mark Crossley leading development (with small contributions from others), is totally different from that early MX beta; do you use/understand any of the new functionality (not documented for legacy software) meaning you can document it for those new to that functionality?
  1. MX has changed dramatically, therefore some of the early MX documentation has been deleted, and some pages make it clear that they apply to an earlier MX release.
  2. MX offers so much functionality, that nobody uses everything MX can do. Some pages use the {{Template:WorkInProgressBanner}} to indicate other contributors are needed to expand the current content