What is METAR and how is it read?
METAR is a Meteorological Aerodrome Report which is for a specific place, at a specific time.

The first line is a report from Sao Paulo at 22:00 on the 17th.

You can use a service such as this one to decode METAR reports.

The rest of the lines are more reports for different time and days.

The groups are:

 SBSP       Reporting station ICAO code
 172220Z    Day of the month (17) and current time in UTC (2220) (Z for Zulu time)
 35008KT    Wind from 350 degrees true at 8 knots
 7000       Horizontal visibility on the ground in metres
 -RA        Current weather (RA = rain), the minus indicates light, plus indicates heavy
 BKN008     Broken clouds at 800 feet
 OVC070     Overcast clouds at 7000 feet
 15/14      Temperature 15C, dew-point 14C
 Q1018      regional atmospheric pressure 1018hPa / US systems use inHG / others use millibars