how to find the average mean temperature for entire year?

Answer 1

THE TEMPERATURE OF THE WORLD is 14.0 C. At least that's the global average surface temperature. The average for the northern hemisphere, 14.6 C, is somewhat warmer and the southern a bit cooler, 13.4. A team of scientists (contact Phil Jones, University of East Anglia, UK, [e-mail]) has gathered data from across a 150-year record and from points around the globe looking for trends. This is what they found: Over the period 1861-1997 the average global temperature rose 0.57 C. The warmest years of the century have all occurred in the 1990s: 1998 (the warmest), 1997, 1995, and 1990. The two periods of greatest warming were 1925-1944 and 1978-1997. Much of the net warming occurred at night; for the period 1950-93, nighttime average minimum temperatures increased 0.18 C per decade while daytime average high temperatures increased 0.08 C per decade. (P.D. Jones et al., Reviews of Geophysics, May 1999.)

Answer 2

If you are looking for the mean temperature of your city for the entire year look at the following two web sites.

http://www.wunderground.com/cgi-bin/findweather/getForecast?query=Mecca%2C+Saudi+Arabia
Just type in your zip code, or city in the upper left
As you go about a third of the way down this page there is a section called View the Personal Weather Stations for this area using Google Maps! Click on that and all the weather collecting stations in your area will be mapped out with the temperature, wind, and weather if any. I believe this site also has the climate stats that you are looking for. You can always take the monthly means, add them up, and divide by 12 to get the annual average.

And the National Weather Forecast Office site for you can be found at
http://www.weather.gov/climate/index.php?wfo=lwx which says near the top of the page "As part of its ongoing efforts to improve service to the public, The National Weather Service has released a local 3-month temperature outlook. Access the product for your area here." Click where it says "here" to get to the weather office nearest you.