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
94.3
99
92
94
97
February
94.7
100
99
91
92
97
March
92.9
98
92
84
93
93
April
94.3
98
96
96
97
May
86.8
89
93
91
98
June
84.2
82
82
81
July
84.8
81
89
91
August
90.6
90
92
93
September
87.7
93
77
92
October
92.0
92
94
95
November
94.9
97
98
96
December
97.2
100
100
98
Average
92.4
98.1
95.5
90.8
91.6
93.9
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.