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
87.2
87
82
91
81
92
February
87.8
98
85
86
76
89
March
90.1
80
92
88
92
88
April
95.0
90
94
99
98
May
94.0
89
95
99
92
June
94.7
90
96
95
95
July
94.4
92
92
96
96
August
92.3
91
87
90
91
September
93.5
92
92
95
93
October
93.3
96
94
95
93
November
90.6
91
89
99
93
December
86.1
91
88
84
85
Average
91.4
87.4
90.0
91.1
92.0
92.2
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
14.7
14
17
13
13
16
February
18.4
17
20
19
15
17
March
20.9
21
21
22
22
22
April
24.8
24
25
25
25
May
28.6
26
30
29
27
June
31.5
30
34
31
31
July
33.1
33
33
32
34
August
32.3
33
32
32
32
September
30.4
29
30
30
29
October
25.6
25
24
26
26
November
19.0
19
20
19
22
December
15.8
16
15
19
14
Average
23.8
17.6
24.3
24.9
24.3
24.4
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
4.1
4
6
2
4
7
February
7.0
5
8
6
5
7
March
8.7
9
9
9
8
12
April
11.8
12
12
10
12
May
16.5
15
18
15
15
June
21.0
19
22
21
20
July
23.2
23
24
23
23
August
22.8
23
23
23
23
September
19.4
19
19
19
20
October
14.4
12
12
15
16
November
7.4
7
9
5
11
December
5.3
5
6
8
3
Average
12.6
5.9
13.2
13.7
13.0
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
7.3
8
10
9
8
5
February
6.3
4
5
6
14
11
March
6.2
11
6
8
2
9
April
3.9
9
5
1
3
May
4.2
11
3
3
3
June
3.3
4
5
5
2
July
2.5
5
4
3
3
August
3.8
8
6
5
2
September
5.1
5
8
5
6
October
3.3
3
2
3
3
November
5.6
8
7
1
5
December
9.1
10
11
7
6
Average
5.2
8.1
6.8
5.8
4.3
4.6
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
4.8
6
5
5
4
5
February
5.0
5
5
5
5
5
March
5.3
4
5
6
5
5
April
5.4
5
5
5
6
May
4.7
5
5
5
4
June
4.3
5
4
4
5
July
4.0
4
5
4
4
August
3.6
4
3
3
3
September
3.6
3
4
3
4
October
3.6
4
3
4
3
November
3.7
4
4
4
4
December
4.0
4
3
4
4
Average
4.4
4.9
4.2
4.4
4.1
4.3
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
240°
238°
258°
257°
253°
February
232°
237°
213°
258°
242°
March
262°
231°
234°
211°
232°
April
230°
229°
253°
246°
May
261°
221°
237°
264°
June
233°
251°
208°
234°
July
224°
212°
219°
206°
August
217°
205°
192°
192°
September
256°
309°
221°
335°
October
263°
239°
240°
221°
November
264°
229°
265°
248°
December
253°
261°
223°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.