Give us a specific weather station ID and the conditions reported so we can check/ verify the static result. But in the past when some one has complained about this situation it is almost always one of two things:
(1) Your computer temporary internet cache is supplying the data. Clear out all your temporary internet files.
(2) Your ISP is caching data on it's servers. Keeping old data on their servers and replying to your request with old data cuts down on their bandwidth usage and costs.
@ PawPaw's house - near KADS, Addison, Texas, USA