Most of this data comes from large data sets with hundreds and thousands of places in them, and I'm adding more all the time. Otherwise, the best bet is to search for nearby placenames. I don't have any practical way to look up specific data for a given time period or date. This site concentrates on long term averages. You might find some recent date-specific data at NCDC and the Climate Prediction Center .
All climate data has errors, it is certain that some are present here.
It has then been transcribed, summarized, modified and converted by many more people in many countries. Please read the disclaimer . Having said all that, every attempt has been made to keep it as accurate as possible, please let me know if you find any major numeric errors. Yes, for some places, as soon as I can get the data processed, formatted, documented and uploaded. The same goes for snowfall, humidity, wind, and so on.