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
87.0
86
90
68
91
88
February
85.5
84
93
81
86
86
March
94.3
97
96
90
95
93
April
95.1
96
95
98
96
May
92.9
91
96
91
96
June
92.9
90
91
96
93
July
94.0
93
98
87
92
August
92.9
94
95
94
97
September
91.9
96
94
97
70
October
85.2
82
79
91
79
November
86.6
90
82
84
92
December
83.0
75
77
84
89
Average
90.4
89.0
90.6
88.0
91.3
89.5
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
8.7
8
9
8
9
10
February
8.2
10
8
9
8
10
March
11.8
12
11
12
12
11
April
15.0
13
13
18
16
May
20.1
22
16
19
21
June
22.8
23
21
26
22
July
26.7
27
27
27
25
August
26.9
27
28
26
26
September
22.4
22
24
22
24
October
16.0
17
19
15
16
November
10.7
10
9
11
11
December
8.0
10
5
5
10
Average
15.7
9.9
16.7
16.2
16.4
16.7
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
3.7
3
4
3
5
5
February
2.8
5
2
3
3
4
March
4.4
5
3
5
4
4
April
6.6
6
5
7
7
May
10.1
11
8
9
11
June
12.3
11
12
14
12
July
14.3
14
14
14
14
August
15.1
16
15
14
15
September
12.9
12
13
12
12
October
8.6
8
10
9
10
November
5.4
5
3
6
6
December
3.5
5
1
2
4
Average
7.8
4.2
8.2
7.9
8.1
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.1
30
19
18
20
36
February
20.3
24
13
17
24
12
March
14.1
13
10
17
12
14
April
13.8
20
13
5
6
May
8.4
5
18
6
13
June
7.4
7
13
7
10
July
2.3
0
2
1
5
August
1.9
5
1
1
3
September
6.0
8
3
9
6
October
11.0
12
9
15
4
November
17.9
6
23
26
20
December
22.0
27
24
27
18
Average
12.7
22.0
10.6
12.4
11.6
11.4
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
7.1
7
7
6
6
9
February
8.1
7
9
7
9
8
March
7.6
7
8
7
7
8
April
8.0
8
8
7
7
May
6.6
6
7
7
7
June
6.8
7
7
7
7
July
6.3
6
6
6
7
August
6.4
6
7
7
6
September
6.7
7
7
7
7
October
6.9
6
6
8
7
November
7.3
6
7
8
8
December
7.0
6
6
9
7
Average
7.0
7.0
6.8
6.8
7.3
7.2
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
145°
133°
187°
162°
181°
February
167°
190°
203°
192°
205°
March
211°
204°
216°
206°
219°
April
206°
215°
249°
229°
May
265°
215°
246°
234°
June
250°
248°
252°
222°
July
250°
261°
258°
246°
August
294°
255°
244°
267°
September
231°
326°
231°
285°
October
102°
226°
182°
217°
November
195°
046°
188°
195°
December
158°
068°
188°
182°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.