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
92
91
89
94
91
February
88.6
97
91
86
76
90
March
92.7
92
93
88
90
94
April
95.7
91
97
99
96
May
96.1
93
97
97
97
June
96.0
94
97
97
96
July
96.0
92
94
95
99
August
97.0
96
96
97
99
September
95.5
93
94
97
92
October
94.9
93
92
96
94
November
88.6
82
89
89
91
December
88.5
90
94
88
96
Average
93.7
93.2
91.7
92.9
93.4
94.7
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
19.4
19
22
18
19
21
February
22.8
21
26
22
21
22
March
24.3
24
25
25
24
28
April
26.6
27
26
25
27
May
29.7
29
30
29
30
June
31.6
32
32
31
31
July
32.6
34
33
31
33
August
32.4
34
32
32
32
September
30.7
30
30
30
30
October
27.6
27
27
27
28
November
22.8
22
24
21
24
December
20.5
19
22
23
18
Average
26.1
21.3
27.3
26.8
26.0
27.0
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
7.4
7
8
6
7
10
February
10.6
8
12
9
9
10
March
11.7
13
12
12
12
15
April
14.5
16
14
13
16
May
18.2
18
19
16
18
June
22.0
22
22
22
22
July
23.1
24
23
23
23
August
23.4
24
23
23
23
September
21.7
21
21
21
22
October
17.7
16
14
17
20
November
12.1
11
14
9
16
December
9.6
10
11
12
6
Average
15.2
9.4
16.2
15.8
15.3
16.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.5
4
1
3
3
3
February
6.5
10
3
10
8
8
March
4.7
6
4
10
7
1
April
3.9
10
0
4
5
May
2.9
5
1
2
3
June
4.4
4
2
5
6
July
3.5
4
4
4
4
August
3.2
3
3
5
3
September
5.2
3
7
4
7
October
3.9
2
1
3
7
November
5.2
11
5
7
6
December
6.9
10
4
3
2
Average
4.6
6.5
4.9
4.0
4.5
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
8.0
8
7
8
8
9
February
8.1
8
9
8
8
9
March
8.5
8
9
9
9
8
April
8.6
9
9
8
8
May
7.7
8
7
9
8
June
6.9
8
7
7
6
July
6.2
7
6
7
7
August
6.0
7
6
6
6
September
7.4
7
7
6
8
October
7.6
8
6
6
8
November
7.6
8
9
7
9
December
7.2
8
6
6
7
Average
7.5
7.9
7.7
7.2
7.2
7.5
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
280°
249°
307°
259°
351°
February
340°
249°
059°
313°
273°
March
050°
245°
206°
053°
203°
April
081°
110°
197°
223°
May
046°
130°
089°
082°
June
243°
079°
155°
067°
July
240°
193°
181°
179°
August
139°
114°
143°
145°
September
048°
031°
070°
058°
October
016°
022°
042°
039°
November
021°
026°
005°
041°
December
341°
031°
258°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.