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
88.9
88
80
88
93
93
February
90.4
79
92
100
96
93
March
91.9
94
83
92
99
96
April
95.0
86
99
98
95
May
96.6
91
97
99
96
June
92.2
98
88
90
96
July
94.2
86
93
96
96
August
94.8
91
96
94
94
September
94.8
95
97
98
86
October
93.8
89
95
96
87
November
92.0
99
95
78
91
December
91.6
93
91
76
98
Average
92.5
87.4
90.2
94.2
93.0
93.5
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
19.5
19
18
20
20
19
February
19.4
19
19
22
20
21
March
20.3
20
19
22
20
19
April
22.6
21
24
22
21
May
22.0
20
23
22
24
June
24.6
22
26
24
25
July
28.1
29
27
27
27
August
28.9
29
30
28
29
September
28.2
26
31
27
30
October
26.5
27
25
25
27
November
22.8
21
22
23
23
December
19.9
22
18
17
21
Average
23.1
19.1
22.7
24.3
22.9
23.8
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
9.4
10
9
9
9
8
February
9.5
12
9
9
10
10
March
11.2
12
11
11
10
11
April
13.4
13
13
13
13
May
14.8
14
15
15
16
June
16.4
16
17
15
17
July
18.7
17
19
19
18
August
19.5
19
20
18
20
September
19.0
19
21
18
18
October
16.2
17
18
14
17
November
11.9
10
11
13
11
December
9.5
12
10
9
9
Average
13.8
11.2
13.7
14.5
13.4
13.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.0
7
14
1
3
0
February
7.6
23
11
0
0
2
March
6.3
12
14
3
4
5
April
1.1
0
1
0
7
May
1.0
1
0
1
1
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.7
4
0
1
0
September
0.2
0
1
0
0
October
0.8
0
0
3
1
November
2.3
1
4
0
5
December
4.2
3
6
11
2
Average
3.5
13.7
3.8
1.1
1.7
1.8
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
4.4
4
6
4
5
4
February
5.2
5
6
5
6
5
March
5.8
6
6
6
6
6
April
6.1
6
7
6
6
May
6.0
6
6
6
6
June
5.5
5
6
6
6
July
5.4
5
5
6
5
August
5.4
5
5
5
6
September
5.3
5
6
5
5
October
4.9
5
5
5
4
November
4.5
4
5
4
4
December
4.0
4
4
4
4
Average
5.2
5.3
5.2
5.4
5.3
5.0
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
246°
195°
227°
216°
228°
February
169°
211°
266°
266°
207°
March
205°
217°
223°
233°
214°
April
222°
235°
214°
195°
May
201°
205°
203°
213°
June
208°
204°
204°
207°
July
200°
198°
213°
216°
August
248°
232°
219°
223°
September
211°
219°
243°
239°
October
238°
210°
248°
219°
November
236°
225°
234°
260°
December
193°
252°
229°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.