A Rocha Portugal Observatory Report 2009-2010
A Rocha Portugal Observatory Report 2009-2010
A Rocha Portugal Observatory Report 2009-2010
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A <strong>Rocha</strong> <strong>Portugal</strong> <strong>Observatory</strong> <strong>Report</strong> <strong>2009</strong>-<strong>2010</strong> 83<br />
CRUZINHA WEATHER REPORT <strong>2009</strong><br />
Andrew Cole<br />
Introduction<br />
Weather data has been recorded every day at Cruzinha, A <strong>Rocha</strong>’s field study centre, since<br />
September 2002 and continued throughout <strong>2009</strong>. The measurements are taken at 09:00 UTC and<br />
consist of:<br />
Current temperature (˚C)<br />
Maximum and minimum temperatures for the previous 24 hours (˚C)<br />
Relative humidity (%)<br />
Rainfall over previous 24 hours<br />
Wind direction and strength (compass bearing, Beaufort scale and km/h)<br />
Cloud cover<br />
Visibility<br />
Additional notes<br />
Summary of the year <strong>2009</strong><br />
The maximum temperature, 40.0˚C, was recorded on 21 June.<br />
The minimum temperature, -2.5˚C, was recorded on 9 January.<br />
Total annual rainfall: 616.5mm.<br />
Maximum rainfall in 24 hours: 61.5mm.<br />
Prevailing wind direction was NW on 52 of 333 days recorded.<br />
The maximum wind strength was level 4 on the Beaufort scale which only occurred on 4<br />
February.<br />
Air temperature and relative humidity<br />
<strong>2009</strong> was slightly warmer than 2008 but very similar to previous years. Average maximum<br />
temperatures in <strong>2009</strong> were 0.5˚C higher than in 2008 and average minimum temperatures were<br />
0.9˚C higher. January had much lower maximum temperatures than average while March had much<br />
higher maximum and minimum temperatures; April had lower temperatures. June had higher<br />
minimum temperatures and August had higher maximum temperatures than average. October,<br />
November and December saw generally higher temperatures than average. In <strong>2009</strong> the relative<br />
humidity was generally lower than in previous years with the exception of January and February. In<br />
particular the summer months had very low relative humidity both compared with other months, as<br />
expected, and when compared with previous years.