Welcome to the Cumulus Support forum.

Latest Cumulus MX V4 release 4.4.2 (build 4085) - 12 March 2025

Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024

Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)

Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki

If you are posting a new Topic about an error or if you need help PLEASE read this first viewtopic.php?p=164080#p164080

Wunderground rainfall data

Discussion specific to Fine Offset and similar rebadged weather stations
Post Reply
User avatar
nking
Posts: 813
Joined: Thu 17 Dec 2009 2:03 pm
Weather Station: W-8681
Operating System: Windows 10
Location: Hurstpierpoint, West Sussex, UK
Contact:

Wunderground rainfall data

Post by nking »

I have just taken a look at the data Wunderground has received from my station :-

10:27 15.5 °C 12.8 °C 1003.9hPa SSE 29.6km/h 41.7km/h 84% 0.3mm
10:42 15.4 °C 12.9 °C 1003.6hPa SSE 28.5km/h 43.9km/h 85% 0.5mm
10:57 15.0 °C 13.0 °C 1003.6hPa SSE 26.7km/h 45.4km/h 88% 1.3mm
11:12 14.9 °C 13.1 °C 1002.9hPa SSE 29.1km/h 37.8km/h 89% 1.5mm
11:27 14.6 °C 13.1 °C 1002.9hPa South 30.1km/h 39.3km/h 91% 1.8mm
11:42 14.4 °C 13.1 °C 1002.9hPa South 25.6km/h 35.6km/h 92% 2.0mm
11:57 14.3 °C 13.2 °C 1002.6hPa South 29.0km/h 41.7km/h 93% 2.0mm
12:12 14.2 °C 13.2 °C 1002.3hPa South 30.9km/h 41.7km/h 94% 2.3mm
12:27 14.3 °C 13.3 °C 1002.3hPa South 25.7km/h 37.8km/h 94% 2.0mm

What seems odd to me is my station has bucket tips of .3mm, this is reflected correctly by Cumulus but the data reported by Wunderground is not in multiples of .3mm :?
Has anyone noticed this with their data and is there a simple explanation.
User avatar
steve
Cumulus Author
Posts: 26672
Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
Operating System: None
Location: Vienne, France
Contact:

Re: Wunderground rainfall data

Post by steve »

It's conversion/rounding error. Wunderground only accepts rainfall in inches.
Steve
User avatar
nking
Posts: 813
Joined: Thu 17 Dec 2009 2:03 pm
Weather Station: W-8681
Operating System: Windows 10
Location: Hurstpierpoint, West Sussex, UK
Contact:

Re: Wunderground rainfall data

Post by nking »

Many thanks Steve ;)

I would like to point out that I don't spend my time comparing data like this - I do sometimes do some work :lol:
Post Reply