1. Correlation Between Precipitation and Temperature by Solaleh Khezri

2. Selected Stations

3. Data Collection Monthly data downloaded from National Climate Data Center for 50 years (1959-2008) Only stations with complete record has been selected Seasons has been defined Seasonal Average has been calculated. Done ANOVA test to assure seasonal group of data are significantly different

4. T-P Correlation Coeff. For Colorado Springs

5. T-P Correlation Coeff. for Chicago

6. Calculation of Correlation Coefficient

7. Spearman Rho Correlation Coefficients Correlation Coefficient WinterSpringSumerFallSum Billing -0.5179-0.1665-0.70413-0.43532-1.82385 0.00010.2478<.00010.0016 Boston -0.1798-0.09205-0.2140.15974-0.32611 0.21150.52490.13560.2678 Charleston 0.17241-0.12982-0.299790.19882-0.05838 0.23120.36890.03440.1663 Chicago 0.233920.009220.01967-0.137370.12544 0.1020.94930.89220.3414 Colorado Spring -0.36762-0.26603-0.41825-0.504-1.5559 0.00860.06190.00250.0002 Los Angeles -0.08737-0.25044-0.108880.085-0.36169 0.54630.07940.45160.5573 Memphis 0.17266-0.15494-0.29795-0.01542-0.29565 0.23050.28260.03560.9154 Miami -0.04702-0.06894-0.064860.05085-0.12997 0.74580.63430.65450.7258 Minneapolis -0.236760.01285-0.082310.03928-0.26694 0.09780.92940.56980.7865 San Antonio -0.36199-0.36665-0.42616-0.01157-1.16637 0.00980.00880.0020.9364 Seattle 0.09610.05792-0.36016-0.12699-0.33313 0.50680.68950.01020.3795 Sioux Falls -0.32671-0.12669-0.15134-0.02956-0.6343 0.02060.38060.29410.8385 Tuscan -0.0694-0.15595-0.14048-0.37965-0.74548 0.6320.27950.33050.0065

8. Pearson’s R Correlation Coefficients Correlation Coefficient WinterSpringSumerFallSum Billing-0.56605-0.12066-0.66069-0.44521-1.79261 <.00010.4039<.00010.0012 Boston-0.192045-0.19485-0.225690.10917-0.50341 0.18150.17510.1150.4504 Charleston0.12329-0.08977-0.276290.16227-0.0805 0.39370.53530.05210.2602 Chicago0.27432-0.05089-0.01197-0.118590.09287 0.05390.72560.93430.4121 Colorado Spring-0.344496-0.31952-0.48949-0.47287-1.62638 0.010.02370.00030.0005 Los Angeles-0.01862-0.23748-0.04701 0.142243 -0.16087 0.89790.09680.74580.3015 Memphis0.13356-0.16126-0.27607-0.08074-0.38451 0.35510.26320.05230.5773 Miami-0.02736-0.10615-0.189640.02752-0.29563 0.85040.46310.18720.8496 Minneapolis-0.18832-0.07849-0.054090.04556-0.27534 0.19030.58790.70910.7534 San Antonio-0.13033-0.3545-0.43281-0.08783-1.00547 0.3670.01150.00170.5442 Seattle 0.105320.01949 -0.33594 -0.15087 -0.362 0.46670.89310.01710.2956 Sioux Falls-0.2737-0.12592-0.3015-0.03038-0.7315 0.05440.38360.03340.8341 Tuscan -0.145413 -0.14069-0.19016-0.40858-0.88484 0.29750.32980.18590.0032

9. T-P Correlation Coeff. for Winter

10. T-P Correlation Coeff. for Spring

11. T-P Correlation Coeff. for Summer

12. T-P Correlation Coefficient for Fall

13. Total Correlation Coefficients

14. Conclusions Temperature and Precipitation are negatively correlated. The correlation is most significant during Summer In mountainous area the correlation is stronger