# How is the rain probability calculated

## Chance of Rain - What Does It Mean?

19.08.2020 – 10:11

WetterOnline Meteorological Services GmbH

A document

What does a rain probability of 50 percent mean? That it only rains for half of the day or that only half of the city is affected? Unfortunately neither of them. We explain the meaning.

Chance of Rain - What Does It Mean?

The forecast of the precipitation in percent

What does a rain probability of 50 percent mean? That it only rains for half of the day or that only half of the city is affected? Unfortunately neither of them. We explain the meaning.

Is it raining?

In weather forecasts, the probability of rain is also given in percent. This often causes confusion, because not everyone is clear what these percentages are supposed to mean. “The indication of the rain probability gives important additional information about whether precipitation will occur or not. It describes the certainty with which precipitation falls at a location during the forecast period, ”explains Birgit Heck, corporate communications spokeswoman for WetterOnline.

Rather get through dry

With a probability of rain of 10 percent, it will remain (almost) certain to be dry. If the value is 30 percent, there is a 30 percent risk of rain falling somewhere in your city. It is advisable to take a look at the WetterRadar from time to time to get through safely dry.

Fifty-fifty chance

With a probability of 50 percent it can rain or stay dry. Both are equally likely and the situation is accordingly uncertain. It is worth packing an umbrella here, only risk-takers should plan an outdoor party, for example.

Must-have: umbrella or rain jacket

If the probability of rain is 90 percent, then you will (almost) certainly get wet at some point in the forecast period. Birgit Heck: “The probability does not say anything about how long and how hard it will rain. It could just as easily be a short shower as it was prolonged rain. "

“By the way, the probability of rain at WetterOnline is called the probability of precipitation. It not only indicates the risk of rain, but also of other forms of precipitation. Examples are snow or hail, ”says Heck.

You can find out whether it could be raining at www.wetteronline.de, with the WetterOnline app or by taking a look at the new weather station wetteronline home, which has won the “German Innovation Award 2020 in Gold”. With the WetterOnline Skill for Amazon Alexa and the WetterOnline Action for the Google Assistant, weather information can also be queried via the digital helpers.

Interested parties can find more weather-related topics in the press releases from WetterOnline.

Imagery

- Caption 1: Rain yes or no: A look at the indication of the rain probability is recommended. - Caption 2: The probability of precipitation indicates whether rubber boots and an umbrella are used.

Photo credits: Source: WetterOnline (please state if used)

The use of the images is only permitted in connection with this press release!

The weather experts from WetterOnline will be happy to give you interviews at [email protected]

With best regards

Birgit Heck Corporate Communications E mailto: [email protected] WetterOnline Meteorological Services GmbH Karl-Legien-Straße 194a D-53117 Bonn District Court Bonn | HRB number 008664 VAT identification number: DE205571094 Managing director: Dr. Joachim Klaßen https://www.wetteronline.de