Monthly median 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
-73.5 -76.5 -77.0 -77.0 -76.0 -77.0 -76.0 -75.0 -77.0 -77.5 -79.0 -78.0
384.05 381.70 382.60 385.60 375.10 378.55 375.75 381.70 373.75 376.85 382.80 379.70
104.5 101.5  97.0  95.0 105.0 101.5 106.0 103.0 106.5 101.5  96.1 100.0
16.18 16.31 16.61 16.79 16.34 16.57 16.37 16.54 16.36 16.52 16.73 16.47
111.03 108.03  90.49 136.84 128.00 124.37 113.65 150.00  86.55  84.08  97.09  95.76
12 10 11 15 17 12 14 11 16 18 15 18