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
83.1
86
95
90
46
88
February
85.0
84
77
90
84
91
March
91.0
92
89
90
92
91
April
95.2
98
95
94
95
May
93.4
98
86
93
92
June
0
0
0
0
July
82.9
61
94
90
75
August
92.9
93
95
93
98
September
95.0
94
90
95
100
October
92.3
95
93
90
82
November
87.6
92
86
95
97
December
0
0
0
0
Average
91.7
89.1
92.1
91.5
91.6
92.9
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.