
Winter especially December is time to visit markets and join the New Years' crowds celebrating in the streets and time for concert and opera lovers. Winter can be also charming when snowfall cover all historical buildings. Especially Lesser Town looks like in fairy tale. For those days you have to be lucky.
January to March and November are months to go if you want to avoid tourist crowds and pay low season rates for accommodation.
Autumn is lovely time to visit when the days are still bright with sunshine. Beautifully coloured trees, much less crowded streets, make autumn really nice choice.

Spring
is great season if you wish avoid the oppressive heat of summer and see the wonderful blossoms on the fruit trees of PetÅ™ín Hill, wander in royal palace gardens or visit leafy grounds of Vysehrad.
Summer is when most travellers heading to this city.


Clothes & Packing
Weather in Prague can be changeable during the spring and summer, so it is worth bring some warmer clothing and a waterproof jacket as well. When visiting Prague during autumn or winter months, bring a good selection of warmer clothes.
Asthma warning: during hot spells, the air quality in Prague can deteriorate rapidly because of pollution, causing some problems to those who suffer with respiratory problems. If you suffer from Asthma you should carry inhalers at all times.

Prague Weather Forecast
CNN.com
BBC.com
Wunderground.com
Good advice: Everyone tells you not to trust the Czech taxi drivers especially to and from the Airport. Simple solution book and prepay your taxis through Prague-Airport-Transfers.co.uk service was superb. England, DEC 07 source TripAdvisor.com