National average climate information from ClimGen

Climate information for West Brazil

Climate observations

How to cite: Osborn et al. (2016)

Climate observations - cloud cover

Although this resource deals mostly with national average climates, it is important to take into consideration the geographical variations in climate that occur across countries. A national average may not be very appropriate when considering countries that include different climate regimes, strong contrasts in orography, etc. Maps are included here to show the geographic variations.

The maps on this page show the 1961-1990 average annual and seasonal cloud cover across this country or region from the CRU TS observations (New et al., 1999). For the seasons, DJF = December to February, MAM = March to May, JJA = June to August, and SON = September to November averages.

The gridded data, including timeseries of monthly values for each 0.5° grid cell, and the underlying station data, are available in scientific formats from here and via a convenient Google Earth interface here.

National average 1961-1990 cloud cover normals for each month of the year are shown in the table and figure below. Seasonal and annual values are also given.


Click for larger image

1961-1990JanFebMarAprMayJunJulAugSepOctNovDec
Cloud cover 90.5 92.7 91.8 86.7 79.3 66.3 59.6 65.5 71.3 77.2 82.4 90.6%
1961-1990MAMJJASONDJFAnnual
Cloud cover 85.9 63.8 77.0 91.3 79.5%

Data files

National-average 1961-1990 CRU TS observed normals can be downloaded: