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
85.8
89
83
87
82
86
February
83.9
95
86
90
68
79
March
90.1
92
93
85
88
87
April
91.9
95
97
98
94
May
94.1
92
96
95
95
June
92.6
96
97
96
94
July
95.4
94
93
96
95
August
93.4
97
92
95
93
September
92.8
94
94
95
92
October
90.4
92
92
92
92
November
85.6
89
89
96
86
December
83.4
89
93
88
85
Average
90.4
92.0
92.0
92.1
91.3
90.1
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
16.2
17
18
15
15
18
February
18.9
18
21
18
15
17
March
20.9
23
21
22
21
22
April
23.9
24
24
24
24
May
27.3
25
28
27
26
June
29.9
29
31
29
29
July
31.6
32
32
31
32
August
31.0
32
31
31
31
September
29.4
30
29
29
29
October
25.8
26
24
26
26
November
20.4
21
21
19
23
December
17.6
19
18
20
16
Average
23.7
19.4
24.9
24.4
23.9
24.5
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
6.3
6
8
4
7
9
February
9.0
7
10
9
7
8
March
10.9
12
12
12
11
13
April
14.0
15
13
13
14
May
18.8
17
20
16
18
June
22.3
21
23
23
22
July
24.0
23
25
24
25
August
23.7
23
24
24
23
September
21.5
19
21
21
22
October
16.4
14
14
16
18
November
10.4
10
13
7
14
December
8.1
8
9
10
6
Average
14.5
8.0
14.9
15.6
14.9
15.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
3
6
5
6
5
February
5.2
6
7
4
10
9
March
3.6
2
5
6
4
5
April
2.6
4
1
1
4
May
2.4
6
2
1
1
June
3.6
3
2
4
4
July
2.5
3
2
4
4
August
4.4
4
6
3
5
September
10.4
2
6
5
4
October
2.6
5
1
4
2
November
5.2
7
4
5
8
December
4.4
6
3
5
2
Average
4.1
3.7
4.6
3.3
3.9
4.2
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
6.6
8
7
8
7
1
February
7.5
8
8
8
8
8
March
8.5
9
8
9
9
8
April
8.1
8
8
8
8
May
7.9
9
8
8
8
June
6.9
7
7
8
7
July
6.2
6
7
6
6
August
5.8
6
5
5
5
September
7.0
7
8
6
7
October
6.9
7
7
6
7
November
7.0
7
8
7
7
December
6.0
7
7
6
6
Average
7.2
8.2
7.2
7.4
7.0
6.5
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
293°
253°
324°
258°
332°
February
316°
242°
091°
321°
254°
March
214°
241°
209°
064°
185°
April
141°
168°
212°
228°
May
057°
189°
145°
172°
June
204°
125°
151°
221°
July
210°
207°
167°
178°
August
180°
180°
114°
179°
September
044°
036°
096°
043°
October
017°
023°
354°
034°
November
014°
023°
353°
027°
December
360°
013°
247°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.