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
82.4
79
84
85
78
February
80.2
89
86
78
75
March
90.1
78
97
95
82
April
91.7
90
88
96
91
May
86.0
47
92
95
June
89.1
66
92
93
July
89.2
95
94
95
August
95.7
99
96
September
93.9
96
98
89
October
91.5
95
94
85
November
87.2
87
85
91
December
83.6
91
83
87
Average
88.3
82.9
87.6
90.0
90.7
88.7
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
13.9
12
16
13
15
February
17.3
19
19
12
16
March
21.5
20
22
22
23
April
23.6
23
24
23
23
May
28.2
28
26
28
June
31.4
32
31
31
July
32.8
33
32
33
August
33.6
36
33
September
31.3
32
30
30
October
25.3
27
26
24
November
18.6
19
18
21
December
15.0
17
17
15
Average
23.2
17.0
25.2
22.5
22.7
24.2
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
1
7
4
6
February
6.4
8
8
1
4
March
9.6
10
10
10
13
April
11.6
12
14
11
12
May
17.1
17
16
16
June
19.9
19
21
20
July
21.6
21
22
23
August
22.0
24
21
September
18.8
19
14
19
October
12.8
14
11
13
November
6.5
8
5
9
December
4.3
5
4
4
Average
11.6
5.9
13.5
9.5
12.1
13.3
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
11
6
4
10
February
7.6
6
7
7
11
March
5.0
5
1
5
11
April
3.7
6
4
3
4
May
3.5
1
6
3
June
3.4
1
3
7
July
2.9
3
2
5
August
2.5
1
3
September
3.6
3
0
9
October
4.1
5
0
7
November
4.8
6
5
3
December
6.5
3
6
6
Average
4.6
7.0
3.3
2.6
4.1
6.4
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
4.8
5
6
5
4
February
5.0
5
6
4
5
March
4.9
4
5
5
5
April
4.6
4
5
4
4
May
3.9
3
4
4
June
3.5
3
3
4
July
3.2
3
3
3
August
3.3
4
3
September
2.7
3
2
3
October
3.7
4
4
3
November
3.5
3
3
3
December
4.2
4
5
5
Average
4.0
4.7
3.7
3.8
4.1
4.0
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
298°
236°
265°
230°
February
221°
213°
051°
230°
March
153°
184°
162°
178°
April
003°
179°
177°
320°
May
203°
130°
180°
June
222°
166°
202°
July
244°
225°
214°
August
315°
243°
September
039°
006°
016°
October
238°
218°
343°
November
242°
051°
031°
December
253°
234°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.