Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
70.1
79
80
60
74
64
February
82.4
73
87
84
89
81
March
89.5
90
91
95
96
85
April
93.0
89
95
97
93
May
93.5
95
95
93
96
June
93.3
97
96
88
94
July
94.4
93
99
90
94
August
93.9
92
95
90
95
September
91.9
94
95
92
92
October
84.7
88
84
86
88
November
80.3
89
82
80
82
December
68.5
73
67
61
74
Average
87.2
81.6
89.7
89.7
87.5
88.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.