We have a little indoor/outdoor home weather station that sits on our kitchen counter. It tells us all kinds of neat information like temperature and humidity with great accuracy.
It even provides a forecast for the next few hours. We have found this to be somewhat less accurate.
If it predicts sun, we watch for rain. If rain is in the forecast, it’s safe to plan a picnic. Recently it showed partly sunny/partly cloudy/and rain all at the same time. Instead, a snowstorm dropped over a foot of snow on us.
These errors may be a result of the fact that the station in still in its 14-day learning mode (as it warns us in large lettering under the weather prediction).
Then again, the 14-day learning mode is well into its fourth year.
At this point we’re not sure if the weather station is a really slow learner or just a dirty rotten liar.