Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
85.0
83
83
92
89
81
February
87.2
97
98
90
86
79
March
93.9
93
97
97
97
92
April
95.5
94
96
95
95
97
May
95.4
98
97
98
90
June
96.7
98
99
96
98
July
95.2
98
95
92
93
August
94.6
95
97
95
91
September
94.2
95
93
95
92
October
92.0
93
98
94
84
November
93.8
97
94
97
97
December
89.2
97
69
88
94
Average
93.0
91.8
95.4
93.9
93.7
91.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
7.6
5
11
6
7
9
February
11.1
15
12
10
4
10
March
15.7
18
15
17
18
17
April
21.1
22
23
20
21
20
May
26.0
26
26
24
24
June
30.0
30
31
30
30
July
31.3
31
32
31
32
August
30.2
29
30
31
30
September
29.0
28
29
28
28
October
22.5
22
24
25
21
November
15.4
16
16
15
18
December
11.5
12
11
16
10
Average
20.4
14.9
21.5
21.2
20.9
20.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-1.4
-2
2
-4
0
1
February
1.1
3
3
-1
-4
0
March
4.6
6
5
5
4
6
April
9.2
11
9
9
7
8
May
15.0
16
17
11
11
June
17.2
18
19
14
13
July
17.0
21
22
8
6
August
15.7
19
20
6
7
September
12.7
15
15
6
5
October
8.8
10
9
8
5
November
3.5
3
5
2
5
December
1.8
2
3
5
0
Average
8.5
4.3
10.3
10.1
5.6
5.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.4
13
8
9
10
19
February
11.0
3
5
12
13
17
March
6.9
3
9
5
5
11
April
8.4
8
6
12
8
9
May
6.9
3
2
7
11
June
5.1
6
3
6
6
July
4.3
4
6
4
4
August
4.3
5
2
3
7
September
3.5
2
2
4
4
October
7.5
7
2
8
8
November
5.7
3
5
6
5
December
6.5
5
10
6
5
Average
6.7
6.5
5.0
5.6
6.5
8.5
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
7.1
7
8
8
7
6
February
7.5
8
8
7
7
7
March
8.3
8
9
9
8
8
April
7.7
9
8
8
8
7
May
6.5
6
8
6
7
June
5.2
5
5
6
6
July
3.9
4
4
4
3
August
4.0
5
4
4
3
September
4.5
4
5
4
4
October
5.2
6
6
4
5
November
6.2
6
6
5
7
December
7.0
7
6
8
7
Average
6.2
8.0
6.1
6.2
5.7
5.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
261°
257°
311°
277°
249°
February
273°
242°
248°
339°
299°
March
245°
243°
248°
183°
269°
April
242°
250°
229°
259°
285°
May
054°
215°
195°
253°
June
312°
258°
218°
221°
July
241°
252°
245°
229°
August
266°
239°
223°
292°
September
189°
346°
234°
198°
October
257°
324°
241°
250°
November
256°
250°
241°
247°
December
229°
247°
228°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.