california
Astoria, Oregon and Quillayute, Washington with 240 days per year.
Olympia, Washington in the lower 48.
Cloudy conditions
According to National Climate Data Center: over 52 years, Buffalo, NY has an annual average of 54 Clear days, 103 Partly Cloudy days and 208 Cloudy days. source: http://www.ncdc.noaa.gov/oa/climate/online/ccd/clpcdy.txt
In England Around February,March time you get a few cloudy days. The Humidity in the air is watervapor which is a gas and is invisible.
california
There are several biomes in the USA therefore many climates are present in the country. The biome that takes up the most land has the usual weather of sunny days and partly cloudy days
Astoria, Oregon and Quillayute, Washington with 240 days per year.
I don't know about "most", but one possible contender: San Diego has a lot of cloudy/partly cloudy days in the spring and early summer (locally colloquially known as "May gray" and "June gloom"), thought it's rare for rain to fall during that time.
Olympia, Washington in the lower 48.
he went through rainy days and sunny days most of the days were cloudy though so dont get your hopes high
Staying inside Gloomy/cloudy Getting wet Bad traffic
Slovenia receives the most rainy days.
South Africa is a country.
The most used is CLDY
In terms of country size and urban density, Japan would be the most urban country in the world, but the country with the most urban area is China.