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
91.8
93
93
90
February
87.6
94
89
92
100
88
March
91.2
87
93
89
100
86
April
94.3
88
97
95
96
May
94.7
96
95
96
95
June
95.6
94
97
92
96
July
94.0
94
97
93
93
August
95.2
99
97
100
93
September
93.6
96
95
100
88
October
93.5
94
93
0
93
November
86.2
85
86
97
87
December
84.2
93
82
70
90
Average
91.9
89.7
92.5
92.8
90.4
91.7
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
17.3
20
16
16
February
21.3
21
23
20
17
19
March
23.3
23
24
24
27
26
April
25.5
26
26
24
26
May
29.5
28
30
29
29
June
32.2
32
34
31
31
July
32.4
33
32
32
33
August
32.6
35
32
27
33
September
30.7
31
30
30
29
October
26.8
27
27
23
28
November
21.5
21
23
19
24
December
18.4
17
21
22
17
Average
25.7
21.6
26.3
26.3
25.1
26.9
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
8
4
7
February
10.5
8
11
7
13
9
March
11.5
12
12
11
27
14
April
13.4
15
14
13
14
May
17.7
17
19
16
16
June
22.1
21
23
22
22
July
22.8
23
23
23
23
August
22.8
23
23
26
23
September
21.0
20
20
30
21
October
15.2
14
12
23
17
November
9.9
9
12
6
12
December
8.4
7
11
11
4
Average
14.9
10.2
14.8
14.9
15.0
16.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
3
6
10
February
5.6
6
7
4
0
6
March
3.6
7
2
6
0
2
April
3.2
6
1
6
3
May
2.4
1
4
1
3
June
2.8
0
1
5
6
July
3.7
2
5
5
4
August
4.4
2
5
0
6
September
3.9
3
3
0
10
October
2.0
2
1
0
2
November
5.9
9
4
5
4
December
4.5
6
0
4
6
Average
4.1
6.4
3.7
3.1
4.7
4.5
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
6.5
7
7
7
February
7.5
7
8
7
10
8
March
7.1
7
8
7
6
7
April
6.8
7
7
6
7
May
5.7
5
6
7
6
June
5.3
6
5
6
6
July
4.4
4
4
4
5
August
4.7
5
4
9
5
September
6.0
5
6
5
7
October
6.2
6
6
7
7
November
7.2
7
8
6
8
December
6.2
7
6
6
6
Average
6.1
6.7
6.2
6.0
5.8
6.4
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
254°
356°
305°
February
233°
241°
135°
198°
002°
March
056°
237°
203°
233°
225°
April
107°
174°
243°
312°
May
074°
203°
155°
136°
June
102°
059°
180°
155°
July
279°
231°
221°
232°
August
338°
129°
091°
211°
September
087°
062°
021°
089°
October
064°
049°
099°
087°
November
056°
061°
041°
065°
December
069°
083°
219°
013°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.