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
85.9
83
85
83
89
90
February
84.8
96
93
87
65
79
March
90.0
86
90
94
97
92
April
94.2
98
92
95
93
May
89.9
89
91
92
89
June
92.7
87
95
91
94
July
92.1
94
86
94
93
August
90.5
91
84
91
94
September
89.0
86
92
89
95
October
90.6
91
93
94
87
November
90.6
96
87
97
90
December
89.6
92
92
95
89
Average
89.9
87.8
91.0
89.3
90.9
90.6
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
7.2
6
10
4
5
10
February
11.3
14
15
11
4
9
March
15.0
18
15
17
17
17
April
20.0
21
19
19
18
May
24.4
23
26
23
22
June
27.9
26
29
28
28
July
30.0
30
29
29
32
August
28.9
29
29
30
29
September
26.5
27
25
26
25
October
21.0
22
19
22
20
November
13.6
15
15
13
17
December
9.9
12
10
14
8
Average
18.8
12.5
20.5
19.6
19.3
19.5
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
-2.9
-1
2
-4
-1
1
February
1.1
2
3
-1
-3
1
March
3.4
6
1
4
4
7
April
7.6
8
8
7
7
May
13.5
12
14
11
12
June
17.0
15
17
18
17
July
19.2
19
21
16
20
August
19.0
19
19
20
19
September
16.0
15
15
16
15
October
9.4
10
6
12
8
November
2.7
3
4
2
5
December
1.0
3
2
4
-1
Average
8.2
2.1
9.1
8.9
8.9
9.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.4
23
15
21
15
13
February
13.9
6
8
14
18
20
March
10.7
10
14
9
6
12
April
9.4
4
14
9
10
May
10.3
12
13
7
13
June
5.8
6
4
9
5
July
4.8
3
12
4
2
August
5.4
5
5
11
4
September
7.2
3
8
10
4
October
8.6
10
5
9
7
November
9.0
6
13
5
9
December
12.1
11
12
7
14
Average
9.6
12.8
7.9
10.5
9.0
9.0
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
5.8
6
6
6
5
6
February
6.3
6
7
7
6
6
March
6.5
6
7
7
6
7
April
6.2
6
6
6
6
May
5.3
5
5
5
5
June
5.0
5
5
5
5
July
4.3
5
5
4
4
August
4.0
4
4
4
4
September
4.2
4
4
5
5
October
4.8
5
5
5
4
November
5.4
5
6
5
5
December
5.2
5
5
6
5
Average
5.3
6.0
5.2
5.4
5.0
5.1
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
242°
233°
263°
260°
243°
February
232°
229°
240°
302°
241°
March
263°
252°
246°
274°
241°
April
246°
244°
252°
260°
May
277°
215°
271°
246°
June
253°
235°
211°
229°
July
224°
215°
249°
222°
August
236°
233°
214°
259°
September
349°
289°
219°
181°
October
246°
244°
209°
225°
November
233°
234°
238°
244°
December
220°
246°
211°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.