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
97.4
100
97
95
99
92
February
95.3
91
96
94
97
96
March
92.4
88
89
96
93
92
April
93.2
97
88
95
89
May
94.9
95
94
94
94
June
91.3
93
93
98
86
July
92.1
99
93
87
90
August
96.8
97
98
95
99
September
93.6
94
93
91
92
October
91.8
93
95
94
92
November
96.5
98
96
95
99
December
98.9
98
99
100
99
Average
94.3
92.7
95.5
94.4
94.8
93.2
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.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
9.7
11
9
9
10
10
February
10.8
11
11
9
13
12
March
14.3
13
16
14
17
14
April
18.3
20
18
19
17
May
22.5
22
22
22
22
June
25.5
26
26
26
26
July
29.2
32
30
29
27
August
31.1
33
31
30
33
September
27.2
30
28
25
28
October
21.4
23
21
21
21
November
17.5
18
18
18
18
December
12.0
13
12
12
12
Average
19.0
11.8
21.1
20.0
20.1
19.9
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
5.7
7
6
5
5
7
February
6.7
7
7
5
8
8
March
10.4
9
12
10
13
10
April
14.9
16
15
15
13
May
19.4
19
19
20
19
June
22.6
23
23
23
23
July
26.4
29
27
26
24
August
28.0
30
28
28
29
September
24.4
27
25
23
25
October
18.5
20
18
18
18
November
14.0
15
15
14
14
December
8.1
9
8
8
8
Average
15.5
7.7
17.7
16.6
16.7
16.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.9
4
7
8
9
16
February
9.2
22
8
8
4
5
March
16.0
20
20
7
14
18
April
12.3
10
21
11
16
May
14.9
19
20
20
16
June
16.7
18
10
16
23
July
16.6
4
23
17
36
August
10.9
10
11
20
1
September
15.5
11
16
20
18
October
17.9
9
17
16
25
November
8.3
10
11
5
5
December
6.6
3
9
7
8
Average
12.9
15.3
10.6
13.4
13.3
15.6
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
6.8
7
6
7
6
6
February
7.4
8
8
7
7
7
March
7.7
8
7
7
8
9
April
9.1
10
8
9
10
May
8.7
9
8
9
8
June
8.2
8
9
8
8
July
8.8
10
9
8
9
August
8.9
10
9
9
9
September
7.8
9
8
7
8
October
7.2
6
7
8
6
November
6.1
6
6
6
6
December
5.7
5
6
6
5
Average
7.7
7.9
7.7
7.6
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
333°
351°
329°
349°
350°
February
351°
347°
343°
259°
348°
March
309°
113°
115°
146°
318°
April
166°
125°
146°
131°
May
152°
145°
164°
160°
June
160°
143°
138°
148°
July
170°
166°
141°
180°
August
158°
161°
163°
148°
September
144°
084°
065°
105°
October
017°
039°
036°
030°
November
238°
026°
026°
023°
December
331°
019°
343°
020°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.