I am from a volunteer at FSHM (Free Software Hardware Movement, Puducherry, India).
As a part of our community project, we have been working on building a weather station using Freedom Hardware. We are experimenting various things, and are building prototypes for the same. The aim of this project is to build a low-cost distributed community based local weather stations.
As a part of this project, we also were exploring ways to keep the weather data open to all, by releasing the data we capture, in either Creative Commons / Peer Production License.
Upon our exploration, we ended up finding, openweathermap.org, who promised to keep the weather data open (We want to post data, not consume it). When we started exploring their api's for posting, we discovered it doesn't work. Our data was never uploaded. Tough we have contacted them on the same, we also wanted to explore other options or online website, where weather data would be kept open and accessible to all.
Please do let us know, if you have come across or used anything.
PS : We want the data to be available under Creative Commons / Peer Production License.
PPS : If there really is none, then we are left with no choice but to write one. Do also let us know if somebody has already started anything similar or already half way through.