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
90.4
95
84
88
91
94
February
88.7
94
87
91
75
87
March
93.6
91
95
87
96
92
April
96.8
95
98
100
98
May
97.1
96
96
99
96
June
97.2
98
98
97
97
July
96.6
94
94
97
98
August
96.6
96
95
95
98
September
95.0
95
94
98
93
October
93.8
88
93
95
93
November
90.6
92
88
98
96
December
88.3
93
93
91
89
Average
94.0
93.3
92.9
93.1
94.8
94.3
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
16.6
17
19
15
16
18
February
19.8
19
23
19
16
18
March
21.8
23
22
23
22
23
April
24.9
26
24
25
25
May
28.4
27
29
28
27
June
30.6
30
32
30
30
July
32.3
34
32
31
33
August
31.6
33
31
31
32
September
29.8
30
29
29
29
October
25.9
26
24
26
27
November
20.4
21
22
19
23
December
17.7
18
18
21
16
Average
24.4
19.8
25.6
24.9
24.3
25.0
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
5.9
6
8
3
6
8
February
8.7
7
11
8
6
8
March
10.5
13
12
11
10
13
April
13.6
15
13
13
13
May
18.3
17
19
16
18
June
21.7
21
22
22
22
July
23.7
24
24
23
24
August
23.5
24
23
23
24
September
20.9
20
20
20
21
October
16.1
15
13
16
18
November
9.6
10
12
6
13
December
7.6
8
9
10
5
Average
14.3
8.6
15.3
15.1
14.3
15.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.4
3
8
5
8
10
February
7.5
10
7
5
14
13
March
5.9
9
7
8
5
7
April
3.9
5
3
2
5
May
4.2
7
4
2
4
June
5.1
4
3
7
4
July
3.6
4
4
5
3
August
5.6
8
7
5
6
September
6.3
6
8
7
7
October
4.5
6
1
5
4
November
7.8
10
9
5
9
December
8.8
10
4
6
5
Average
5.8
7.2
6.6
5.0
5.7
6.1
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
8.4
10
7
9
8
9
February
8.6
9
8
9
9
9
March
9.3
9
9
10
9
9
April
9.2
9
9
9
10
May
8.7
9
9
9
8
June
7.6
8
7
8
8
July
6.9
7
8
7
6
August
6.5
7
6
6
6
September
7.7
7
8
7
8
October
7.4
7
7
7
8
November
7.8
8
9
8
8
December
7.6
8
7
7
7
Average
8.1
9.0
7.7
8.1
7.8
8.0
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
255°
244°
321°
272°
297°
February
286°
245°
180°
303°
254°
March
251°
238°
199°
093°
209°
April
167°
185°
242°
246°
May
044°
196°
193°
194°
June
208°
128°
177°
243°
July
217°
209°
206°
198°
August
195°
198°
178°
196°
September
024°
026°
073°
042°
October
360°
010°
337°
055°
November
008°
022°
346°
053°
December
337°
005°
253°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.