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
0
0
0
0
0
February
94.3
90
95
98
100
99
March
94.0
97
95
94
91
April
94.7
84
98
92
98
May
0
0
0
0
June
0
0
0
0
July
0
0
0
0
August
97.1
90
100
99
99
September
96.5
97
94
99
99
October
98.1
98
100
98
95
November
0
0
0
0
December
0
0
0
0
Average
95.0
90.0
93.5
96.4
96.0
96.2
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.