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
91.5
90
91
86
94
94
February
90.0
90
91
93
92
79
March
92.7
89
93
95
95
94
April
90.7
91
89
91
96
94
May
88.8
93
85
93
88
91
June
88.0
91
88
84
86
91
July
88.1
79
89
94
94
87
August
87.0
92
88
93
89
87
September
88.2
92
82
89
93
October
85.7
79
88
79
90
November
89.5
91
91
90
90
December
93.3
97
94
94
94
Average
89.5
89.3
89.4
90.2
90.4
90.2
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
28.6
29
27
28
30
28
February
28.2
30
28
28
28
27
March
28.4
29
29
29
29
27
April
25.9
29
25
26
24
25
May
24.1
27
24
23
24
23
June
23.3
26
23
22
22
24
July
23.3
23
23
25
22
24
August
23.7
26
26
23
24
23
September
26.8
30
22
28
29
October
26.3
27
27
24
28
November
26.4
29
25
26
27
December
28.0
30
27
26
28
Average
26.1
27.1
26.7
25.3
25.5
26.0
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
19.1
19
19
19
20
19
February
18.9
19
20
19
19
19
March
18.7
20
19
20
19
17
April
16.6
18
16
17
16
15
May
14.3
16
15
13
14
11
June
13.0
13
12
13
13
14
July
11.6
13
13
13
9
13
August
12.4
11
14
13
13
12
September
15.1
17
13
16
16
October
16.9
18
17
16
17
November
16.6
19
15
16
16
December
18.2
19
18
17
19
Average
15.9
16.2
16.5
15.6
15.5
15.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
8
11
15
5
7
February
9.0
6
8
5
8
19
March
5.2
11
3
5
3
5
April
4.7
1
9
3
4
1
May
4.1
4
5
4
3
2
June
4.3
2
7
1
5
7
July
2.7
9
2
1
2
1
August
6.8
4
5
4
5
8
September
5.9
3
14
3
5
October
8.9
7
6
16
9
November
7.6
7
7
9
7
December
7.2
2
14
9
7
Average
6.3
5.8
5.8
6.4
6.0
6.5
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
6.1
7
6
6
6
6
February
6.0
6
7
6
6
6
March
5.9
6
6
6
6
6
April
6.0
6
6
7
6
6
May
6.2
7
5
7
6
7
June
6.0
6
6
6
6
7
July
6.1
5
7
7
6
7
August
6.6
7
7
8
7
6
September
6.5
7
7
7
7
October
6.4
7
7
7
7
November
6.7
7
7
7
6
December
6.2
7
6
6
7
Average
6.2
6.1
6.5
6.6
6.4
6.4
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°
352°
001°
021°
324°
February
083°
321°
093°
062°
061°
March
106°
053°
012°
020°
103°
April
058°
078°
091°
119°
100°
May
360°
081°
002°
023°
347°
June
025°
023°
056°
082°
014°
July
080°
055°
042°
067°
030°
August
065°
063°
077°
092°
084°
September
055°
109°
105°
083°
October
061°
083°
101°
120°
November
018°
120°
120°
132°
December
114°
072°
125°
007°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.