Monthly mean values at the tropopause for: 
temp. (deg C), potential temp. (deg.K), press. (hPa), alt. (km) and ozone (ppb)
and the number of soundings per month
-75.87 -78.50 -79.58 -79.96 -77.69 -76.86 -75.45 -75.30 -75.84 -77.77 -78.15 -78.37
373.87 377.98 375.04 371.99 375.20 373.14 373.40 374.53 372.27 375.25 374.37 375.72
114.39  99.01  99.63 101.71 102.91 106.73 109.17 108.30 109.43 102.64 102.88 101.20
16.10 16.65 16.57 16.47 16.46 16.25 16.08 16.12 16.06 16.44 16.40 16.53
132.96 133.44 133.80 105.02  99.83 131.56 136.15 134.53 133.24 127.65 150.35 153.99
23 18 19 23 16 14 29 23 32 30 26 19