Slowly but surely.

I've been cycling seriously for about 3 months. My first "long" ride was a rolling 10 mile ride and I barely averaged over 10 mph moving speed. Today I rode a very hilly 12 mile ride at 13.1 mph moving speed. It's also a lot hotter now (mid 90s today) than back then so I'm sure if it was cooler I would be even faster. Last week I did a rolling 21 mile ride averaging 14 mph moving speed and the week before did a very hilly 30 mile charity ride averaging almost 13 mph.