Nov & Dec temp / humidity report
Posted by Bret B on January 9, 2016, 8:12 pm 187.139.64.166
Now that the cooler weather has finally arrived (almost TOO cool for me!), here is a small summary of the temperature and humidity data from November and December. Several people have asked whether the last couple months have set any records for La Manzanilla. Short answer: only one parameter for one of the months set a new record. I record and/or calculate four parameters per day. Here are the definitions (more explanations to follow in the 2015 temperature & humidity report, coming soon): Tmax: average of the daily highest afternoon temperatures for the month RHmin: average of the daily lowest afternoon relative humidity readings (presumed to occur at the same time as Tmax.) HImax: average of the daily highest afternoon heat indices for the month (also presumed to occur at the same time as Tmax. Calculated using Tmax and RHmin.) DP: average of the daily dew points for the month (doesn't change much during the day. Calculated using Tmax and RHmin. More about this parameter in the next report.) November 2015: Tmax avg was 87.5°F / 30.8°C. This was the 3rd highest Tmax avg for Nov in our records (2004-2015), after 2006 (87.9°F / 31.1°C) and 2004 (87.7°F / 31.1°C.) The average (or "normal") Tmax for Nov is 85.6°F / 29.8°C. RHmin avg was 67.2%. This was the 4th worst RHmin avg for Nov in our records, after 2007, 2010, 2011. Normal for Nov is 66.6%. RH isn't the most useful parameter, since it see-saws up and down throughout the day, inversely with the temperature. See heat index (below) for a better parameter that tries to measure how hot it "feels". HImax avg was 97.4°F / 36.3°C. This was a 1st place record by far. This probably explains a lot of the comlaints regarding the heat back in Nov. Normal for Nov is 92.7°F / 33.7°C. December 2015: Tmax avg = 84.0°F / 28.9°C. This was the 3rd highest in our records for Dec, after 2004 (86.7°F / 30.4°C) and 2006 (86.0°F / 30.0°C.) Normal = 82.6°F / 28.1°C. RHmin avg = 69.0% This was 6th worst after 2010, 2011, 2012, 2013, 2014. Normal for Dec = 66.0%. HImax avg = 90.2°F / 32.3°C. This was a close 2nd place after 2004 (90.4°F / 32.4°C.) Pretty sweaty for Dec, just not a record. Sorry! Normal = 86.4°F / 30.2°C.
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