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
90.0
86
91
98
88
98
February
85.9
80
93
96
83
98
March
92.1
88
94
96
95
90
April
96.4
100
96
99
100
96
May
97.3
96
94
97
95
99
June
99.7
100
100
100
100
100
July
99.6
99
100
100
100
100
August
99.3
100
100
100
100
99
September
98.9
100
98
100
100
96
October
96.8
94
99
98
96
99
November
92.8
100
95
90
94
December
86.0
90
61
96
84
Average
95.4
94.9
96.6
96.6
95.8
96.3
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.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
8.2
9
7
10
8
9
February
10.0
11
9
13
11
11
March
13.5
13
17
10
11
15
April
19.5
23
20
22
22
16
May
24.6
22
24
23
26
25
June
30.8
31
29
30
32
32
July
32.8
31
32
33
33
33
August
32.2
32
34
33
35
29
September
26.8
27
26
29
26
27
October
20.4
20
22
21
17
21
November
14.1
18
16
14
13
December
9.4
12
6
11
7
Average
20.5
21.7
20.7
20.8
20.5
19.8
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
-1.9
1
-1
0
0
0
February
1.5
3
1
3
2
1
March
4.6
5
7
2
3
6
April
9.2
12
10
10
11
8
May
14.1
13
14
13
15
14
June
19.6
20
19
20
20
20
July
21.0
21
21
22
22
22
August
20.2
21
22
20
23
19
September
17.1
17
17
18
17
18
October
11.6
11
13
13
10
12
November
5.9
7
7
5
6
December
2.4
4
2
1
1
Average
10.8
12.3
11.1
10.9
10.8
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.4
9
4
0
4
3
February
6.4
5
3
0
9
2
March
4.8
8
3
4
8
5
April
3.8
2
3
2
1
9
May
2.7
5
4
2
2
3
June
1.2
0
1
2
0
1
July
0.6
2
0
0
0
1
August
0.8
0
0
1
0
3
September
1.2
0
2
0
1
3
October
3.3
2
3
4
6
1
November
2.7
1
2
1
2
December
3.1
3
13
0
5
Average
2.7
3.2
2.2
1.9
2.4
3.1
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
6.5
7
5
8
6
6
February
6.9
6
7
8
8
8
March
7.9
7
7
10
8
8
April
8.0
7
8
9
8
8
May
7.9
8
8
9
8
9
June
8.2
8
7
8
9
9
July
8.6
7
9
10
8
9
August
8.1
7
8
9
8
8
September
7.3
7
7
7
8
7
October
6.3
6
7
7
6
6
November
6.0
8
6
5
6
December
5.6
7
4
7
4
Average
7.4
7.0
7.4
8.2
7.6
7.5
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
295°
325°
290°
291°
297°
February
339°
307°
302°
299°
301°
March
352°
333°
010°
301°
349°
April
005°
338°
329°
323°
343°
May
009°
330°
332°
345°
315°
June
350°
001°
359°
041°
003°
July
033°
342°
031°
015°
036°
August
021°
030°
066°
051°
029°
September
060°
041°
349°
338°
060°
October
319°
306°
308°
313°
060°
November
293°
299°
302°
314°
December
291°
310°
293°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.