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
91.6
91
91
89
90
92
February
87.1
92
87
83
81
88
March
89.2
88
85
78
89
94
April
94.1
94
93
95
94
94
May
94.3
90
94
97
97
June
93.5
92
95
95
93
July
95.5
97
93
94
98
August
94.7
94
94
94
98
September
94.1
96
91
91
89
October
93.1
91
92
97
89
November
86.9
83
79
92
86
December
87.2
89
90
81
94
Average
92.0
91.1
90.9
89.5
91.7
92.9
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
20.2
20
22
19
19
21
February
24.0
22
26
23
23
23
March
25.4
25
26
26
25
28
April
27.5
27
28
27
26
27
May
30.4
29
31
30
29
June
31.9
32
34
31
31
July
32.3
33
33
31
32
August
32.4
34
33
32
32
September
31.2
32
30
30
30
October
28.4
28
28
28
29
November
23.6
23
24
22
25
December
21.4
21
23
24
19
Average
27.0
23.5
27.8
27.6
26.8
27.1
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
7.5
8
8
7
7
9
February
10.8
8
12
9
9
10
March
11.9
13
13
13
12
14
April
14.5
13
16
15
13
15
May
17.8
18
18
15
17
June
21.8
21
22
21
21
July
22.7
23
23
23
23
August
23.0
23
23
24
23
September
20.3
21
21
17
22
October
17.3
16
14
17
19
November
12.2
12
14
10
15
December
9.8
11
11
12
5
Average
15.2
10.8
16.2
16.0
15.1
16.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.0
4
4
1
2
3
February
6.2
9
7
7
9
5
March
4.6
8
3
10
7
0
April
3.1
3
2
2
3
6
May
3.6
2
2
1
5
June
5.8
4
3
3
11
July
4.9
2
4
7
4
August
6.3
5
2
6
6
September
4.7
2
7
5
9
October
3.5
2
1
2
7
November
6.2
11
11
3
11
December
6.2
7
4
1
7
Average
4.9
6.0
3.9
4.4
4.0
6.2
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
7.0
7
6
7
7
7
February
7.0
7
8
7
7
8
March
7.2
7
7
7
7
7
April
7.2
7
8
7
6
8
May
6.4
6
6
7
7
June
5.9
7
6
6
5
July
5.0
5
5
5
6
August
5.1
6
5
5
5
September
5.8
6
6
4
6
October
6.4
6
5
5
7
November
6.6
6
8
6
8
December
6.3
7
5
6
6
Average
6.3
6.8
6.5
6.0
6.0
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
269°
242°
323°
250°
059°
February
255°
243°
078°
260°
246°
March
174°
241°
207°
044°
210°
April
204°
087°
128°
242°
241°
May
020°
184°
091°
044°
June
250°
099°
174°
091°
July
250°
205°
185°
224°
August
197°
134°
158°
199°
September
055°
030°
087°
056°
October
025°
025°
031°
050°
November
019°
029°
012°
048°
December
351°
049°
239°
310°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.