# Relative humidity data exceeds 100%

**URL:** <https://forum.ecmwf.int/t/relative-humidity-data-exceeds-100/1579>\
**Category:** C3S - Datasets and Usage\
**Tags:** c3s, era5, global\_reanalysis\
**Created:** [14 November 2019 12:52 UTC](https://forum.ecmwf.int/t/relative-humidity-data-exceeds-100/1579 "2019-11-14T12:52:57Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Michela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/898d66/32.png) [@Michela](https://forum.ecmwf.int/u/Michela)\
**Post date:** [14 November 2019 12:52 UTC](https://forum.ecmwf.int/t/relative-humidity-data-exceeds-100/1579/1 "2019-11-14T12:52:57Z")

</div>

ERA5 relative humidity data&nbsp;on pressure levels above 500 hPa can exceeds 100%. This could be due to supersaturation with respect to ice at cold temperatures.

See the ERA5 IFS documentation (CY41R2), Part IV Physical processes, Chapter 7- Clouds and large-scale precipitation, for more information:

[https://www.ecmwf.int/en/publications/ifs-documentation](https://www.ecmwf.int/en/publications/ifs-documentation)