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
85.0
89
91
80
84
84
February
96.6
98
91
97
98
98
March
95.6
96
95
100
93
98
April
97.3
97
95
98
95
99
May
96.4
93
96
98
98
100
June
97.6
98
99
98
97
98
July
97.4
97
99
99
96
97
August
96.5
97
93
96
95
98
September
96.3
96
96
95
98
97
October
96.0
96
95
98
94
99
November
91.7
96
95
84
95
December
87.7
90
80
93
91
Average
95.3
95.8
95.1
95.6
94.3
96.6
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
6.0
6
7
6
5
8
February
9.1
11
9
10
9
10
March
12.2
13
11
14
12
12
April
15.6
16
14
15
12
19
May
20.0
21
20
22
17
20
June
24.5
22
27
25
25
23
July
25.1
24
25
26
23
24
August
25.3
26
24
28
22
27
September
21.2
21
24
20
22
22
October
16.3
16
17
18
16
15
November
10.2
10
12
9
12
December
7.2
8
3
8
7
Average
16.3
17.6
16.4
17.0
14.9
16.5
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
1.1
0
3
2
1
3
February
2.0
6
2
3
1
3
March
3.1
6
4
2
2
3
April
4.6
7
5
5
1
5
May
8.3
11
8
9
7
6
June
12.8
12
13
12
14
12
July
13.6
14
14
13
14
12
August
13.9
15
14
14
13
16
September
10.4
11
13
11
11
10
October
8.6
9
10
10
7
9
November
4.2
5
6
3
5
December
2.6
4
-2
3
4
Average
7.3
9.0
7.8
7.2
6.3
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.2
21
26
24
35
15
February
18.4
23
13
28
15
30
March
17.9
18
30
6
14
15
April
14.3
21
17
14
20
3
May
13.8
18
11
9
26
6
June
9.7
11
7
13
9
14
July
12.1
13
19
6
17
14
August
11.8
7
18
3
21
10
September
13.1
17
6
21
7
9
October
15.5
11
19
10
14
24
November
18.5
31
9
23
7
December
26.0
27
15
19
33
Average
15.2
15.4
17.4
12.2
17.7
13.8
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
8.2
8
9
8
7
8
February
9.2
9
9
12
8
13
March
8.7
8
9
7
8
9
April
7.7
9
8
8
7
7
May
6.7
6
6
7
9
7
June
6.4
7
6
6
6
6
July
6.5
6
8
7
6
7
August
6.2
6
7
6
6
7
September
6.3
7
6
7
5
6
October
7.5
7
7
7
8
8
November
7.5
10
8
6
7
December
8.0
10
5
7
8
Average
7.2
7.0
7.7
7.0
7.0
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
230°
222°
258°
231°
191°
February
202°
277°
237°
133°
230°
March
186°
227°
114°
261°
218°
April
232°
342°
294°
309°
094°
May
225°
005°
273°
230°
337°
June
264°
023°
263°
283°
238°
July
248°
242°
314°
237°
272°
August
230°
254°
345°
279°
219°
September
186°
162°
237°
185°
184°
October
160°
191°
165°
181°
195°
November
216°
171°
221°
166°
December
225°
125°
178°
159°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.