Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
90.2
90
86
93
91
80
February
90.1
97
90
92
88
83
March
94.4
92
97
97
94
86
April
96.9
94
99
99
96
May
95.5
95
96
98
92
June
93.9
83
97
97
92
July
88.6
63
95
86
90
August
93.6
96
90
88
94
September
89.8
77
91
85
93
October
92.1
97
99
82
90
November
94.2
95
93
96
94
December
87.3
88
74
86
89
Average
92.4
92.7
88.1
93.8
90.9
90.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi 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
11.5
10
14
10
11
13
February
15.7
17
18
15
13
14
March
18.8
20
19
20
20
20
April
22.6
22
23
22
22
May
26.8
26
28
25
25
June
29.6
27
32
29
29
July
30.2
22
33
31
32
August
31.1
32
30
31
31
September
28.5
24
28
28
28
October
23.7
24
23
24
24
November
17.0
19
18
16
19
December
13.7
14
14
18
12
Average
21.6
15.4
21.7
23.1
22.3
22.3
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
1.8
0
5
-1
3
5
February
4.7
4
7
2
1
4
March
7.2
8
7
7
8
11
April
9.7
10
10
9
9
May
15.4
15
17
14
14
June
18.9
16
20
20
19
July
20.5
13
23
21
22
August
20.9
21
21
22
22
September
17.1
13
16
18
17
October
11.7
11
7
14
13
November
4.8
6
6
3
7
December
3.8
3
7
7
1
Average
10.5
3.7
10.5
11.4
11.5
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.3
12
8
8
5
11
February
10.4
5
9
7
12
17
March
6.8
12
6
3
6
13
April
6.0
9
3
2
8
May
4.0
5
4
1
7
June
3.8
2
1
6
3
July
2.4
0
2
5
2
August
3.5
0
6
6
4
September
3.6
1
5
4
4
October
5.4
5
1
6
7
November
4.8
5
5
2
7
December
8.8
7
18
4
6
Average
5.9
9.9
4.3
4.5
4.6
7.0
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
5
4
5
5
4
February
5.0
5
5
6
5
5
March
5.6
5
6
6
5
5
April
5.3
5
6
5
5
May
4.1
4
5
4
4
June
3.7
3
4
4
4
July
2.7
0
4
3
3
August
2.7
0
3
3
3
September
3.3
1
4
3
4
October
3.1
0
4
3
3
November
3.7
2
4
4
4
December
4.2
4
4
4
4
Average
4.1
4.9
2.7
4.4
4.0
4.0
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
299°
251°
309°
297°
243°
February
242°
237°
247°
325°
294°
March
274°
281°
239°
353°
253°
April
274°
236°
280°
299°
May
332°
233°
291°
267°
June
303°
015°
215°
271°
July
360°
222°
232°
270°
August
360°
247°
203°
307°
September
021°
023°
018°
017°
October
360°
345°
266°
010°
November
302°
350°
004°
345°
December
296°
248°
239°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.