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
92.2
93
84
99
98
93
February
91.3
86
98
99
77
97
March
94.2
95
86
97
96
95
April
94.8
91
94
98
94
May
88.8
82
90
86
92
June
89.8
86
94
98
89
July
96.0
96
97
99
90
August
96.8
98
98
99
99
September
95.8
93
95
96
98
October
95.5
95
89
92
99
November
96.3
96
96
94
97
December
94.6
93
93
90
98
Average
93.6
91.5
91.4
95.0
93.8
94.8
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
18.6
18
16
20
20
20
February
18.6
17
17
21
20
21
March
20.0
18
17
23
20
18
April
24.0
24
25
24
22
May
24.3
22
26
25
28
June
29.2
25
32
31
28
July
33.4
34
32
33
33
August
33.8
34
35
33
35
September
31.4
28
33
32
35
October
27.9
29
27
26
30
November
23.6
24
20
26
24
December
18.9
21
16
17
20
Average
24.5
17.6
24.0
26.1
25.5
26.1
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
5.1
5
5
6
5
4
February
5.0
7
3
4
5
5
March
6.9
7
6
7
6
7
April
9.5
8
10
9
11
May
11.4
11
11
11
13
June
14.0
13
15
14
14
July
17.6
17
17
19
16
August
18.3
18
20
18
19
September
16.4
16
19
16
16
October
12.0
13
13
11
13
November
7.5
8
6
8
7
December
5.0
6
4
5
4
Average
10.2
6.3
10.3
11.1
10.5
10.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.4
6
14
0
0
0
February
2.5
14
4
3
0
0
March
3.7
10
15
2
5
0
April
0.2
0
0
1
0
May
0.3
2
0
0
0
June
0.0
0
0
0
0
July
0.1
0
0
1
0
August
0.2
2
0
0
0
September
0.3
0
2
0
0
October
0.4
1
0
3
0
November
0.6
1
4
0
0
December
2.4
1
7
11
0
Average
1.9
9.7
3.2
1.1
1.6
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
3.5
3
4
3
3
3
February
4.1
4
5
5
3
4
March
4.5
5
5
5
4
4
April
5.0
4
5
5
4
May
5.3
5
5
5
5
June
5.0
5
5
5
5
July
5.1
5
5
5
5
August
5.1
5
5
5
5
September
4.3
4
5
5
1
October
4.0
4
4
5
1
November
3.7
4
4
4
2
December
3.1
3
3
3
2
Average
4.4
4.0
4.4
4.7
4.4
3.4
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
227°
229°
012°
319°
292°
February
210°
212°
309°
235°
245°
March
204°
206°
213°
205°
215°
April
205°
211°
208°
211°
May
205°
208°
206°
206°
June
205°
209°
204°
209°
July
205°
205°
206°
207°
August
210°
205°
204°
208°
September
208°
206°
207°
206°
October
216°
203°
208°
234°
November
241°
218°
213°
214°
December
312°
208°
208°
137°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.