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
97.6
99
100
99
99
98
February
95.6
95
97
100
80
98
March
96.4
98
99
98
91
99
April
93.4
98
99
99
96
100
May
99.5
99
100
99
100
June
94.1
100
99
97
81
July
95.2
99
98
99
75
August
98.6
98
97
98
100
September
98.2
100
100
99
98
October
98.5
99
99
99
98
November
99.0
99
99
100
99
December
97.0
94
96
99
100
Average
96.9
97.5
98.5
98.6
96.5
95.3
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
13.6
14
14
14
14
14
February
16.1
17
15
15
14
15
March
20.4
20
20
20
20
20
April
24.6
25
26
27
25
26
May
30.5
30
33
31
32
June
34.1
35
35
35
29
July
34.0
38
35
33
28
August
34.0
36
32
32
36
September
30.7
33
30
31
30
October
24.6
26
22
26
27
November
18.8
19
16
21
21
December
14.1
15
14
17
13
Average
24.0
18.7
25.5
24.7
24.8
24.2
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
-1.1
0
0
-3
-2
0
February
1.8
3
0
-1
2
2
March
5.0
6
4
3
4
7
April
8.0
7
7
9
8
9
May
12.6
11
13
12
14
June
17.1
17
18
18
14
July
18.7
17
19
19
16
August
19.2
19
18
19
20
September
15.3
17
14
14
14
October
9.5
10
9
9
8
November
3.1
4
0
3
5
December
-1.7
-1
1
2
-3
Average
8.5
3.8
8.7
8.6
8.9
8.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.5
3
3
0
0
4
February
2.2
2
3
2
4
3
March
1.4
1
2
3
2
4
April
0.5
1
0
0
3
0
May
0.1
0
0
1
0
June
1.2
0
2
4
0
July
0.7
0
1
1
0
August
1.5
3
4
3
0
September
0.9
2
0
2
1
October
1.4
0
2
0
2
November
1.1
2
0
1
0
December
1.7
4
5
2
1
Average
1.2
1.5
1.4
1.5
1.8
1.0
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
6.2
7
7
5
6
6
February
7.4
8
8
7
6
7
March
8.1
9
9
8
9
8
April
8.1
8
8
9
8
8
May
8.0
7
9
9
7
June
6.9
8
6
6
7
July
5.9
6
6
6
5
August
5.5
6
5
6
5
September
5.3
5
5
5
5
October
6.2
6
5
7
5
November
5.3
5
6
4
6
December
5.7
6
6
7
6
Average
6.7
7.8
6.8
6.4
6.6
6.2
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
216°
208°
243°
254°
277°
February
240°
215°
205°
220°
221°
March
225°
222°
222°
216°
198°
April
228°
243°
216°
222°
224°
May
210°
218°
209°
228°
June
223°
227°
207°
208°
July
193°
149°
184°
240°
August
202°
145°
187°
222°
September
207°
197°
214°
270°
October
201°
257°
227°
210°
November
220°
200°
243°
211°
December
282°
219°
199°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.