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
82.2
81
76
92
78
81
February
83.0
96
81
73
71
86
March
90.1
92
88
90
89
April
92.8
87
95
98
98
May
91.7
93
93
97
81
June
94.7
90
99
95
92
July
95.1
95
87
98
98
August
93.6
90
94
97
93
September
93.4
97
92
93
88
October
90.2
98
88
93
86
November
89.2
94
87
99
86
December
84.0
83
74
87
87
Average
90.1
88.3
89.9
89.4
91.9
89.0
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
12.0
12
14
11
11
13
February
16.1
16
18
16
12
15
March
18.4
19
20
20
20
April
23.1
23
23
23
23
May
26.7
25
28
27
24
June
30.1
29
32
30
29
July
32.5
33
33
32
33
August
31.4
32
31
32
31
September
28.7
28
28
28
27
October
24.0
24
22
25
24
November
17.2
18
18
17
20
December
13.9
15
12
18
13
Average
21.8
13.7
23.0
23.1
23.0
22.6
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
2.3
2
5
0
1
4
February
5.2
5
7
4
2
5
March
7.2
8
8
8
10
April
11.0
11
11
10
10
May
16.0
15
17
14
14
June
19.8
18
20
20
20
July
22.1
22
23
22
23
August
21.4
22
21
22
22
September
18.3
18
17
17
18
October
12.6
12
10
14
13
November
5.8
6
8
4
8
December
3.9
4
4
7
2
Average
11.1
3.4
12.4
12.1
11.8
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.3
17
10
9
9
13
February
10.4
9
9
10
13
14
March
8.2
8
10
8
9
April
7.4
17
4
4
5
May
5.4
8
3
3
10
June
3.8
8
1
3
4
July
2.1
1
3
3
2
August
4.5
8
3
4
6
September
5.2
2
8
5
9
October
5.1
2
3
5
7
November
6.5
6
9
3
4
December
10.8
15
9
5
6
Average
7.2
13.3
7.6
5.7
5.1
7.1
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
6.5
7
7
7
6
7
February
7.2
7
7
7
7
7
March
7.6
8
8
7
7
April
7.4
7
7
7
8
May
6.9
8
7
7
7
June
5.9
6
6
6
6
July
5.5
5
6
6
5
August
5.1
5
5
5
5
September
5.9
5
7
5
7
October
5.8
6
6
6
5
November
5.7
5
7
6
5
December
5.9
6
5
7
6
Average
6.4
7.4
6.2
6.5
6.2
6.3
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
270°
238°
324°
305°
295°
February
236°
221°
225°
352°
225°
March
244°
221°
030°
216°
April
224°
227°
261°
252°
May
010°
189°
270°
322°
June
309°
316°
197°
236°
July
264°
208°
222°
220°
August
289°
254°
157°
201°
September
022°
017°
003°
029°
October
291°
351°
281°
024°
November
031°
042°
329°
109°
December
273°
013°
216°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.