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
93.0
91
93
98
85
93
February
96.8
99
100
100
97
89
March
97.5
95
98
95
99
100
April
99.4
100
100
100
99
99
May
99.8
100
99
100
100
100
June
99.8
99
100
100
100
100
July
99.8
100
100
100
100
100
August
99.9
100
100
100
100
September
99.6
99
100
100
99
October
98.3
97
99
99
97
November
95.0
84
98
99
93
December
88.8
92
80
92
87
Average
97.8
97.8
97.4
98.3
97.7
97.0
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
11.0
12
11
13
8
11
February
14.3
15
14
16
15
16
March
16.3
16
19
14
17
16
April
19.9
21
25
18
18
19
May
25.4
25
25
28
25
26
June
30.4
29
30
32
30
30
July
35.2
36
36
38
34
37
August
34.3
36
35
35
33
September
27.8
26
28
27
28
October
22.4
23
24
23
19
November
14.9
16
16
14
15
December
11.8
11
12
13
11
Average
22.1
22.0
22.5
23.2
21.4
21.6
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
0.2
3
1
-2
-2
2
February
2.1
4
-1
2
5
3
March
4.8
5
5
6
4
6
April
7.3
6
8
6
8
9
May
11.2
10
11
12
11
12
June
16.1
15
17
17
16
15
July
19.3
20
20
21
18
20
August
19.0
20
20
19
18
September
14.8
15
15
15
14
October
10.1
12
12
9
8
November
5.5
7
7
3
6
December
2.5
1
6
3
3
Average
9.4
9.0
9.7
10.4
8.9
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
8
1
1
10
5
February
4.6
4
1
6
4
0
March
8.0
10
1
18
1
10
April
7.1
1
2
10
12
9
May
2.4
0
5
1
2
5
June
2.1
5
7
0
2
0
July
0.4
0
0
0
1
0
August
0.4
0
0
0
2
September
2.9
7
3
3
1
October
5.1
6
7
5
4
November
6.8
7
9
1
14
December
5.8
1
30
7
2
Average
3.9
3.8
3.1
5.6
3.7
4.1
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
4.8
3
6
3
6
5
February
5.4
7
4
4
6
4
March
6.8
8
7
6
5
7
April
5.9
5
6
7
5
5
May
5.8
6
6
6
6
5
June
6.1
6
5
7
6
6
July
6.0
6
7
6
6
5
August
5.6
6
6
6
6
September
4.9
4
6
5
5
October
4.9
6
4
4
6
November
6.0
7
6
5
3
December
5.0
4
4
5
7
Average
5.7
6.0
5.7
5.4
5.4
5.3
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
233°
290°
328°
245°
280°
February
269°
012°
316°
219°
239°
March
219°
230°
094°
027°
269°
April
230°
261°
236°
205°
202°
May
244°
017°
249°
246°
208°
June
227°
210°
220°
212°
243°
July
221°
231°
206°
243°
226°
August
241°
201°
231°
238°
September
205°
225°
211°
233°
October
218°
216°
233°
268°
November
232°
227°
317°
066°
December
275°
203°
255°
259°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.