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
89.6
92
88
91
93
92
February
89.2
98
98
92
90
88
March
94.8
97
97
98
98
94
April
97.0
97
98
98
97
97
May
96.2
97
97
97
94
June
97.2
96
99
97
99
July
96.0
97
96
95
94
August
97.3
97
99
97
97
September
95.7
97
96
96
97
October
92.9
96
95
95
88
November
93.4
97
93
94
96
December
92.5
96
84
95
93
Average
94.8
96.0
96.2
95.5
95.3
94.2
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
6.4
5
10
5
6
9
February
10.2
15
13
9
4
9
March
15.0
17
15
16
18
16
April
20.1
22
21
19
20
18
May
24.8
25
26
24
23
June
29.3
29
30
30
30
July
30.7
30
32
30
32
August
29.7
29
30
31
29
September
28.0
28
27
28
26
October
21.3
22
21
23
20
November
13.6
16
15
13
17
December
10.4
11
9
15
9
Average
19.6
14.4
20.9
20.3
20.1
19.9
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
-2.1
-2
2
-5
-1
1
February
-1.8
1
3
-2
-4
1
March
4.2
6
4
4
5
6
April
8.6
11
8
9
8
7
May
14.4
13
16
12
13
June
18.2
16
18
19
18
July
20.4
21
22
20
21
August
19.2
19
20
20
19
September
15.8
15
15
17
15
October
10.0
10
8
14
9
November
2.8
4
3
2
5
December
1.3
2
2
4
-1
Average
9.1
4.1
9.8
9.3
9.7
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
6.4
6
7
7
6
6
February
6.6
7
8
7
5
7
March
7.7
8
8
8
8
8
April
7.0
8
7
7
7
6
May
5.8
5
6
5
6
June
5.0
5
5
5
5
July
3.9
4
4
4
3
August
4.0
4
4
4
4
September
4.4
4
5
5
5
October
5.5
5
6
6
5
November
6.1
6
6
6
6
December
6.3
6
6
7
6
Average
5.8
7.3
5.6
5.7
5.5
5.4
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
227°
224°
274°
228°
220°
February
220°
205°
215°
305°
241°
March
217°
209°
219°
184°
233°
April
210°
213°
200°
221°
247°
May
039°
171°
165°
206°
June
019°
209°
189°
181°
July
203°
207°
208°
202°
August
210°
202°
182°
027°
September
128°
017°
197°
143°
October
222°
203°
197°
190°
November
214°
215°
211°
215°
December
206°
197°
200°
221°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.