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
86.4
85
84
92
80
91
February
84.2
93
87
88
69
87
March
89.9
85
89
90
88
91
April
93.1
88
98
99
95
May
91.8
88
93
98
82
June
94.0
93
97
90
90
July
95.5
97
92
95
98
August
94.4
93
98
94
92
September
92.3
92
94
97
86
October
90.2
94
94
92
82
November
90.5
98
92
98
89
December
86.7
87
84
92
81
Average
90.7
87.4
90.8
93.2
91.6
88.9
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
11.8
13
15
10
10
13
February
15.7
16
18
16
11
14
March
17.9
20
18
20
19
20
April
22.8
24
23
23
22
May
26.4
25
27
26
24
June
30.0
30
32
30
29
July
32.6
33
33
31
33
August
31.4
33
32
32
31
September
28.4
29
29
28
26
October
23.4
24
22
24
24
November
16.9
18
19
16
20
December
13.7
16
12
18
12
Average
21.8
16.2
23.4
23.2
22.4
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
1.9
3
5
-1
1
4
February
4.6
5
7
3
1
5
March
6.3
8
7
8
4
10
April
10.6
11
11
9
10
May
15.5
14
17
13
14
June
19.4
18
20
20
20
July
22.0
23
23
21
22
August
21.3
22
21
22
22
September
18.1
18
17
18
17
October
12.4
12
10
14
13
November
5.4
5
8
4
8
December
3.4
5
4
6
2
Average
11.0
5.2
12.3
12.1
11.1
12.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
13
13
10
13
8
February
12.3
7
13
10
19
12
March
8.6
11
9
8
8
7
April
7.3
13
3
2
6
May
6.8
10
4
5
15
June
4.9
9
1
6
8
July
3.0
4
4
6
2
August
3.6
4
2
5
4
September
5.8
9
5
3
9
October
5.6
7
2
4
8
November
7.4
4
5
4
6
December
10.2
11
11
5
12
Average
7.3
10.3
8.6
4.8
6.3
7.8
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
6.4
7
6
7
5
7
February
7.0
7
7
7
7
7
March
7.4
7
7
8
7
8
April
7.4
7
7
7
8
May
6.9
8
7
6
7
June
6.1
6
6
6
7
July
5.9
6
6
6
6
August
5.3
5
5
5
5
September
6.0
5
6
6
6
October
5.5
5
5
6
5
November
5.6
5
6
6
5
December
5.6
5
5
6
6
Average
6.4
7.0
6.1
6.3
6.0
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
233°
236°
276°
274°
262°
February
245°
233°
217°
337°
239°
March
262°
243°
233°
255°
227°
April
219°
241°
254°
244°
May
026°
239°
242°
229°
June
238°
215°
223°
222°
July
227°
222°
222°
226°
August
229°
197°
195°
207°
September
021°
055°
194°
048°
October
287°
330°
260°
078°
November
030°
105°
300°
203°
December
229°
339°
226°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.