# Rainfall measurement is wildly inaccurate **URL:** \ **Category:** Tempest Owners\ **Tags:** tempest\ **Created:** [July 6, 2020, 12:15pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556 "2020-07-06T12:15:59Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![annbal](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/annbal/32/7745_2.png) [@annbal](https://community.tempest.earth/u/annbal)\ **Post date:** [July 6, 2020, 12:15pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/1 "2020-07-06T12:15:59Z")
I am a new owner and observer. I find the haptic rain monitor/sensor to be extremely off. I’ve suspected it for some time, now I’ve confirmed it. I have a CoCoRaHS rain gauge to compare to - last night the Tempest reports we got .38", we actually got .87". That’s off by over half. It’s said it somehow calibrates itself eventually, how long does this take? The station has been installed for a month now. We’ve had two heavy rainfalls, some light between (or so I think - they may have been heavier here, happened when I was at work). Last night’s rain was torrential, during a thunderstorm. ---
**Author:** ![bodean](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/bodean/32/7657_2.png) [@bodean](https://community.tempest.earth/u/bodean)\ **Post date:** [July 6, 2020, 12:45pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/2 "2020-07-06T12:45:40Z")
Would like to know also ---
**Author:** ![bmcgrady384](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/bmcgrady384/32/7301_2.png) [@bmcgrady384](https://community.tempest.earth/u/bmcgrady384)\ **Post date:** [July 6, 2020, 1:52pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/3 "2020-07-06T13:52:59Z")
> **[Rain Check](https://help.weatherflow.com/hc/en-us/articles/360024436634-Rain-Check)** > > Overview > The WeatherFlow RainCheck system is a free and optional bonus feature that provides a best estimate of rain accumulation using raw data from the haptic sensor in your SKY or Tempest and ad... ---
**Author:** ![gizmoev](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/gizmoev/32/941_2.png) [@gizmoev](https://community.tempest.earth/u/gizmoev)\ **Post date:** [July 6, 2020, 2:29pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/4 "2020-07-06T14:29:38Z")
If you want to speed up the calibration you can report your rain results as stated in this thread: [SKY/Tempest vs. co-located rain gauge” reporting,](https://community.tempest.earth/t/sky-tempest-vs-co-located-rain-gauge-reporting/5623) ---
**Author:** ![annbal](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/annbal/32/7745_2.png) [@annbal](https://community.tempest.earth/u/annbal)\ **Post date:** [July 6, 2020, 6:08pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/5 "2020-07-06T18:08:04Z")
I’ve had that enabled since day one. Doesn’t seem to be doing much. Take care, Ann ---
**Author:** ![annbal](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/annbal/32/7745_2.png) [@annbal](https://community.tempest.earth/u/annbal)\ **Post date:** [July 6, 2020, 6:21pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/6 "2020-07-06T18:21:03Z")
I can’t seem to get past the station ID. My station says on my web interface page the ‘share link’ is [https://tempestwx.com/station/19623](https://tempestwx.com/station/19623), but it keeps asking for a valid station ID. ---
**Author:** ![gizmoev](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/gizmoev/32/941_2.png) [@gizmoev](https://community.tempest.earth/u/gizmoev)\ **Post date:** [July 6, 2020, 6:31pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/7 "2020-07-06T18:31:50Z")
Your Station ID is just the number part in that link: 19623. ---
**Author:** ![annbal](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/annbal/32/7745_2.png) [@annbal](https://community.tempest.earth/u/annbal)\ **Post date:** [July 6, 2020, 6:32pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/8 "2020-07-06T18:32:59Z")
Perfect, thank you!!! ---
**Author:** ![annbal](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/annbal/32/7745_2.png) [@annbal](https://community.tempest.earth/u/annbal)\ **Post date:** [July 6, 2020, 6:36pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/9 "2020-07-06T18:36:07Z")
Interesting, I’ve just checked, and it’s up to .52 from earlier today - there’s been no additional rain, so something adjusted. Still isn’t right though. I’m entering data in the Rain Check system now. Thank you all for your help! ---
**Author:** ![gizmoev](https://sea2.discourse-cdn.com/flex020/user_avatar/community.tempest.earth/gizmoev/32/941_2.png) [@gizmoev](https://community.tempest.earth/u/gizmoev)\ **Post date:** [July 6, 2020, 6:40pm UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/10 "2020-07-06T18:40:56Z")
You’re welcome. I have found that it takes several rain events and with varying intensities for the calibration to get reasonably close. The adjustment you are seeing is from RainCheck running as can be seen by the rain drop with check mark: ![image](https://us1.discourse-cdn.com/flex020/uploads/sws/original/2X/0/051aa89a4433ce64dc2a4ec867f2b4bba76386e9.png) . You can turn this on/off in the Advanced menu for the device settings. ---
**Author:** ![gmr670](https://avatars.discourse-cdn.com/v4/letter/g/c57346/32.png) [@gmr670](https://community.tempest.earth/u/gmr670)\ **Post date:** [July 9, 2020, 9:20am UTC](https://community.tempest.earth/t/rainfall-measurement-is-wildly-inaccurate/7556/11 "2020-07-09T09:20:48Z")
I have two Sky devices an old and new device both showing very different readings. I reset them about 10-minutes apart (I think early April 2020) but unfortunately did this incorrectly so I lost all historic data!!! The UV, brightness, solar radiation are all completely different. I have my old Vantage Pro setup next to these and I trust those readings (rainfall) way more. Wind is also out when comparing the two units. Understandably the location of installation will affect this so some degree, but I’d not expect by huge amount especially with higher winds. Today (at the time of writing) the Vantage Pro indicated 2.8mm rain and both Sky units showing zero rain. I don’t know which device to trust. [https://tempestwx.com/station/2434/grid](https://tempestwx.com/station/2434/grid) ![20200411_184231](https://us1.discourse-cdn.com/flex020/uploads/sws/original/2X/2/2ecfe83326c64de0126031d928f8fbcc751eee32.jpeg) ![20200411_184239](https://us1.discourse-cdn.com/flex020/uploads/sws/original/2X/8/8ced07e71513bb1dee5bba9a9b045bbb257f83e5.jpeg)