1. Is the climate changing? The way you present the data affects your judgment Chris Goodall At Magdalen College School, Oxford March 2010

2. Oxford 1971–2000 averages Oxford (63 m AMSL) Max TempMin Temp Days of Air Frost SunshineRainfall Days of Rainfall 1mm Wind at 10 m Month[°C] [days][hours][mm][days][knots] Jan 7.21.98.858.057.511.5N/A Feb 7.61.78.572.042.69.2N/A Mar 10.33.44.0107.950.010.5N/A Apr 12.84.72.1150.046.28.7N/A May 16.57.50.2191.953.99.1N/A Jun 19.510.50.0187.854.58.7N/A Jul 22.312.80.0205.538.26.7N/A Aug 21.912.60.0193.854.47.8N/A Sep 18.610.50.0138.658.99.1N/A Oct 14.47.40.7108.261.810.6N/A Nov 10.14.34.572.059.410.1N/A Dec 8.02.87.351.864.710.9N/A Year 14.16.736.11537.4642.0112.9N/A Source: Met Office Average

3. Oxford Location: 4509E 2072N, 63 metres amsl Estimated data is marked with a * after the value. Missing data (more than 2 days missing in month) is marked by -- Sunshine data taken from an automatic Kipp & Zonen sensor marked with a #, otherwise sunshine data taken from a Campbell Stokes recorder. yyyy mm tmax tmin af rain sun degC degC day mm hours 1853 1 8.4 2.74 62.8 --- 1853 2 3.2 -1.819 29.3 --- 1853 37.7-0.62025.9 --- 1853 412.6 4.5 0 60.1 --- 1853 516.86.1 0 59.5 --- 1853 620.110.7 0 82.0 --- 1853 721.212.2 0 86.2 --- 1853 820.210.8 0 72.3 --- 1853 917.38.4 0 51.3 --- 1853 1013.97.4 0 102.3 --- 1853 118.72.3 10 49.6 --- 1853 123.7 -1.3 19 10.7 --- 1854 1 6.71.5 11 54.5 --- 1854 2 8.0 0.6 12 22.6 --- 1854 3 11.22.2 8 10.6 --- 1854 4 15.03.5 2 19.9 --- Source: Met Office Source data available online

4. Oxford average daily maximum temperatures for three periods Source: Met Office

5. Oxford average daily minimum temperatures for three periods Source: Met Office

6. 1961-19901971-2000 2009 Average daily maximum (degrees Celsius) Average daily minimum (degrees Celsius) 13.8 14.1 15.2 6.4 6.7 7.0 Summary Oxford data Source: Met Office

7. Number of months in year with over 100mm rainfall Source: Met Office

8. Number of months in year with over 100mm rainfall Source: Met Office

9. Number of months in year with over 100mm rainfall Source: Met Office

10. Number of months in year with over 100mm rainfall Source: Met Office

11. Number of months in year with over 100mm rainfall Source: Met Office

12. Number of airfrost days per year Source: Met Office

13. Number of airfrost days per year Source: Met Office

14. April airfrost days Source: Met Office

15. Average daily July maximum temperatures Source: Met Office

16. Average daily July maximum temperatures Source: Met Office

17. Average daily July maximum temperatures Source: Met Office

18. Average daily July maximum temperatures Source: Met Office

19. Average daily January minimum temperature Source: Met Office

20. Average daily January minimum temperature Source: Met Office

21. Average daily January minimum temperature Source: Met Office

22. Average daily January minimum temperature What did this chart look like five years ago? Source: Met Office

23. 2010 * Average daily January minimum temperature And what about this year? Source: Met Office

24. 1961-19901971-2000 2009 Average daily maximum (degrees Celsius) Average daily minimum (degrees Celsius) 13.8 14.1 15.2 6.4 6.7 7.0 Summary Oxford data Source: Met Office