A Rocha Portugal Observatory Report 2009-2010

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88 A Rocha Portugal Observatory Report 2009-2010 Introduction CRUZINHA WEATHER REPORT 2010 Reda Garmute Weather data has been recorded every day at Cruzinha, A Rocha’s field study centre, since September 2002 and continued throughout 2010. The measurements were taken as close as possible to 9 am UTC and consisted of: Current temperature (˚C) Maximum and minimum temperatures for the previous 24 hours (˚C) Relative humidity (%) Rainfall over previous 24 hours Wind direction and strength (compass bearing, Beaufort scale and km/h) Cloud cover Visibility Additional notes Summary of the year 2010 The maximum temperature, 41.5˚C, was recorded on 10 August. The minimum temperature, 1.9˚C, was recorded on 3 December. Total annual rainfall: 889.0 mm. Maximum rainfall in 24 hours: 50.0 mm on 25 December. Prevailing wind direction was N on 36 out of 351 days recorded. The maximum wind strength was level 4 on the Beaufort scale and was reached on six days in December-November. Air temperature and relative humidity 2010 was slightly warmer than 2009 but very similar to previous years. Average maximum temperatures in 2010 were 0.4˚C higher than in 2009 and average minimum temperatures were 0.3˚C higher. The average maximum temperatures recorded in 2010 were very similar to previous years, excluding April and the hottest months of the year: July, August and September which showed much higher maximum temperatures than in previous years. The minimum temperatures recorded in 2010 varied more than maximum temperatures around the average of previous years this century. Throughout January - April the minimum temperatures were higher, whilst in June temperatures were lower. Changing again, the minimum temperature in August was higher, in October - lower and in December higher again. In 2010 the relative humidity was generally lower than in previous years. In particular, the summer months had a very low relative humidity both compared with other months, as expected, and when compared with previous years.
A Rocha Portugal Observatory Report 2009-2010 89 Figure 4 Average monthly maximum and minimum air temperatures for 2010 and averages for 2003- 2009. To show the across year variation in the 2003-2009 data, error bars are plotted which represent one standard error. Figure 5 Monthly relative humidity for 2010 and the average for 2003-2009. To show the across year variation in the 2003-2008 data, error bars are plotted which represent one standard error.
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Contents Preface The Great Spotted
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A Rocha Portugal Observatory Report 2009-2010

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