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
87.9
96
87
99
85
96
February
83.4
88
81
86
67
95
March
86.9
87
86
90
92
85
April
91.2
95
79
95
99
97
May
96.1
100
94
98
92
96
June
99.5
99
100
100
99
100
July
99.9
100
100
100
100
100
August
99.9
100
100
100
100
100
September
99.3
100
97
99
100
October
97.4
97
97
96
99
November
91.3
97
92
86
95
December
81.6
77
74
88
82
Average
93.8
96.1
92.2
95.4
93.1
95.9
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
5.7
6
6
7
6
7
February
6.2
8
5
8
5
8
March
9.2
9
11
7
9
11
April
15.3
19
15
16
16
13
May
21.7
20
23
21
22
21
June
28.2
31
27
28
28
28
July
30.6
31
30
30
30
32
August
29.6
30
32
30
32
28
September
24.6
25
25
22
25
October
18.5
19
19
15
20
November
11.9
15
13
12
11
December
7.7
9
7
9
6
Average
17.5
19.0
18.0
17.8
17.2
17.5
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
-1.5
-2
0
-2
1
1
February
-1.6
1
-3
1
-1
0
March
2.9
4
4
0
2
3
April
6.6
9
8
6
8
4
May
11.9
11
14
10
12
11
June
18.0
20
18
18
19
17
July
21.1
22
21
21
21
21
August
20.7
21
22
21
22
19
September
16.2
17
17
16
17
October
10.6
11
12
9
12
November
5.2
7
6
4
6
December
2.6
2
4
2
2
Average
9.6
10.8
10.2
9.6
9.5
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.0
1
14
5
9
8
February
13.0
13
13
5
13
6
March
9.1
16
0
14
11
4
April
3.5
1
3
0
2
7
May
4.4
5
6
6
4
6
June
2.4
3
4
2
1
0
July
1.5
1
1
2
1
1
August
1.8
1
1
1
1
4
September
4.8
5
7
12
1
October
7.6
4
14
15
0
November
13.8
2
7
7
23
December
17.6
20
25
8
26
Average
6.6
4.6
5.2
6.2
6.2
6.3
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
9.9
11
11
11
9
9
February
10.4
10
10
10
10
12
March
10.7
9
10
11
11
11
April
10.2
10
9
10
11
10
May
9.9
9
10
10
11
11
June
9.7
10
9
9
11
10
July
10.3
9
10
10
9
11
August
10.7
10
10
13
10
10
September
11.0
11
10
10
12
October
10.6
11
10
10
13
November
10.5
10
10
11
12
December
10.2
11
12
9
9
Average
10.3
9.8
10.3
10.5
10.1
10.9
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
332°
154°
337°
096°
346°
February
150°
344°
151°
355°
353°
March
138°
100°
350°
065°
141°
April
143°
122°
125°
041°
110°
May
067°
322°
355°
141°
358°
June
348°
094°
046°
087°
112°
July
118°
116°
076°
102°
122°
August
133°
125°
140°
120°
091°
September
149°
091°
012°
137°
October
348°
026°
133°
146°
November
318°
330°
255°
046°
December
204°
155°
340°
135°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.