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
82.2
76
77
90
92
78
February
87.0
98
95
89
88
77
March
92.3
93
92
97
96
94
April
94.1
96
96
90
95
May
91.7
95
97
97
91
June
96.3
96
98
97
97
July
95.1
96
93
95
93
August
94.3
93
94
94
93
September
93.6
94
90
96
94
October
92.2
93
98
96
84
November
90.9
92
93
97
93
December
88.0
91
74
90
94
Average
91.5
89.0
92.7
93.3
94.0
90.5
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
6.0
4
9
4
6
8
February
10.1
14
13
8
3
9
March
14.1
17
14
15
17
16
April
19.4
21
19
20
18
May
24.2
25
26
23
23
June
29.2
29
30
29
29
July
30.4
31
31
30
31
August
29.5
30
30
31
29
September
28.3
28
28
28
27
October
21.2
21
21
23
20
November
13.0
15
14
13
16
December
9.7
11
8
14
8
Average
18.6
11.6
20.5
19.8
19.7
19.3
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
-2.2
-3
1
-5
-1
0
February
-1.9
1
2
-3
-5
-1
March
3.6
5
3
3
5
6
April
7.9
8
8
8
7
May
14.4
14
16
12
13
June
18.2
16
18
19
18
July
20.1
20
21
20
21
August
18.8
19
18
19
19
September
15.5
15
14
15
15
October
9.5
10
7
13
8
November
2.2
3
3
0
5
December
0.5
1
1
3
-1
Average
8.1
0.9
9.2
8.6
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
13.9
20
9
14
9
21
February
12.5
4
5
17
18
16
March
7.5
2
6
9
5
9
April
8.7
6
11
8
10
May
6.0
4
3
7
9
June
4.4
3
4
7
7
July
3.1
4
8
3
2
August
3.6
3
3
2
5
September
4.3
3
3
5
2
October
7.0
8
4
7
8
November
6.0
4
6
5
5
December
9.4
10
10
9
10
Average
7.0
8.7
5.1
7.1
6.5
8.2
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
8.2
8
9
8
8
7
February
8.5
9
9
8
8
9
March
9.4
10
10
10
9
9
April
8.9
9
9
9
8
May
7.6
7
9
7
8
June
6.0
6
6
6
6
July
4.4
5
4
4
4
August
4.5
5
4
4
4
September
5.5
5
6
6
6
October
7.5
8
9
8
7
November
7.9
7
8
8
9
December
8.0
8
7
9
8
Average
7.3
9.0
7.1
7.2
7.0
6.8
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
255°
256°
289°
255°
241°
February
245°
229°
252°
330°
276°
March
220°
237°
235°
173°
235°
April
225°
222°
239°
271°
May
065°
198°
187°
233°
June
351°
252°
201°
205°
July
231°
242°
227°
231°
August
244°
253°
214°
337°
September
164°
333°
219°
238°
October
242°
224°
229°
233°
November
242°
234°
230°
228°
December
226°
210°
219°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.