There are several sources of information you can use to find the mean annual temperature and precipitation values for your site. The following are a few suggestions:

• You can find all 3 basic NPP model inputs (temperature, precipitation and biome) from a gridded database of worldwide locations available on the GLOBE Carbon Cycle web site. You enter your latitude and longitude. There is also information there about how to find the latitude and longitude of your town on the internet. Or you can use a GPS to get your latitude and longitude. The worldwide data base is located at globecarboncycle.unh.edu/GlobalBiomassModel.shtml (or from the GLOBE Carbon Cycle home page globecarboncycle.unh.edu , you can navigate to the Activities tab and then to Modeling and then on to the Global Biomass Model page).
• From a nearby weather station you can get 30 year average annual temperature in degrees C and total annual rainfall in millimeters. Sometimes this information is given in inches of preciptation and degrees Fahrenheit. You can convert by these formulas:
  C = (5/9)*(F-32)
  mm = 25.4*inches
• Temperature and precipitation and other climate variables can be accessed through the web sites of several climate data networks. A few examples are:
  U.S. National Climate Data Center www.ncdc.noaa.gov
  World Meteorological Organization www.wmo.org
  United Nations Food and Agricultural Organization www.fao.org
  In addition to climate data, these sites contain a great deal of other interesting information about the world we live in.
• From a long-term weather record of your own data if your site has had a weather station operating for 10 years or more.