On the day of my birth the sun emerged from the clouds and light shone upon the Earth. I know it was so because WeatherSpark told me.
WeatherSpark is a pretty amazing Google Map of current and historical weather conditions. The site lets you view the historical records of over 4,000 weather stations.
If you want to know what the weather was like in Honolulu on the day of Barack Obama's birth in August 1961 all you have to do is use the time-line to bring up the correct date and centre the map on Honolulu. You can then view the recorded weather for that day (a balmy 30 degrees centigrade).
If you are more interested in today's weather you can just centre the map on your location and view the current temperature and the current precipitation radar results.