1 Mean relative humidity for an average year is recorded as 71.1% and on a monthly basis it ranges from 63% in July to 77% in January.  Hours of sunshine range between 5.6 hours per day in January and 12.3 hours per day in July.
Formation of the United Nations. The United Nations was created October 24, 1945 shortly after WWII. With the war coming to a climax those who had faced off against the Axis powers never wanted a war of this scale to happen ever again. So these countries decided to meet in San Francisco in the April of that same year.
The UN's headquarters are in NYC and the land on which it is built was 'donated' by David Rockefeller. The UN basically replaced the League of Nations which was brought into being with Woodrow Wilson pushing it at the end of WWI and it was officially founded as a result of the Treaty of Versailles in 19191920.