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
93.1
93
96
94
90
0
February
94.1
93
95
95
94
March
92.1
94
92
88
93
April
93.8
96
94
93
95
May
96.4
96
96
96
June
94.7
94
95
94
July
96.6
98
97
97
August
97.0
97
97
98
September
98.8
99
99
100
October
98.0
99
96
100
November
93.3
96
93
93
0
December
94.6
97
96
92
93
Average
94.7
94.0
96.1
95.0
95.0
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.