Astroclimatology of Paranal

Monthly Statistics (99-03) Fwhm vs. Hbar Annual Statistics ( 1999-2004 2006 2005 2004 2003 2002 2001 2000 1999 )

Fwhm at Paranal: Annual Statistics under photometric conditions

Yearly statistics 1999-2006 (10mn averages, 1190000 samples)

Photometric Nighttime (23h-10hUT)	median (")	5 percentile
1999	0.78	0.44
2000	0.75	0.43
2001	0.80	0.46
2002	0.92	0.57
2003	0.72	0.42
2004	0.71	0.45
2005	0.78	0.50
2006	0.87	0.55
1999-2006	0.83	0.47

Seeing statistics 1999-2004 (10mn averages, 562422 samples)

Photometric Nighttime (23h-10hUT)	median (")	fwhm < 0.5" (%)
January	0.86	09
February	0.84	10
March	0.75	09
April	0.70	09
May	0.79	09
June	0.80	09
July	0.79	09
August	0.84	09
September	0.84	09
October	0.81	09
November	0.77	09
December	0.83	09
Year	0.80	09

Relation of fwhm to the turbulence characteristic altitude (m above the site) for the period 1999-2003 (one curve per year, Median hbar=3270m)

Statistics 1999-2004 (10mn averages)

Statistics 2006 (10mn averages)

Statistics 2005 (10mn averages)

Statistics 2004 (10mn averages)

Statistics 2003 (10mn averages)

Statistics 2002 (10mn averages)

Statistics 2001 (10mn averages)

Statistics 2000 (10mn averages)

Statistics 1999 (10mn averages)