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
84.1
80
82
85
93
83
February
83.6
94
88
86
73
75
March
93.1
90
95
99
94
87
April
93.8
95
93
99
97
May
94.7
96
95
96
95
June
95.2
88
99
95
98
July
95.2
97
97
93
95
August
93.9
93
94
91
94
September
93.9
97
96
95
94
October
90.5
95
99
93
83
November
91.7
97
94
92
97
December
84.0
87
72
86
88
Average
91.3
87.9
92.5
93.5
91.7
91.2
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
8.5
6
11
7
8
10
February
12.5
15
15
11
6
11
March
16.6
18
16
17
18
17
April
20.4
22
19
20
19
May
25.5
25
26
25
23
June
29.1
28
31
29
29
July
30.8
30
33
30
32
August
29.5
29
29
30
29
September
27.5
27
27
26
26
October
21.6
22
21
23
21
November
14.4
16
15
13
17
December
11.4
12
11
16
10
Average
19.9
12.7
21.2
20.4
20.3
20.5
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
-1.9
-2
3
-4
0
3
February
2.3
4
5
0
-2
2
March
6.0
7
5
6
7
8
April
9.1
9
9
8
8
May
15.3
14
16
14
14
June
18.0
13
19
19
18
July
21.0
21
22
21
22
August
19.6
20
20
21
19
September
16.5
16
15
16
16
October
10.5
11
8
14
11
November
3.7
5
5
2
6
December
2.3
3
3
6
0
Average
9.6
2.7
10.4
9.4
10.3
10.6
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
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
7.2
7
7
7
7
7
February
7.8
8
8
8
6
8
March
8.1
8
8
8
8
8
April
7.2
8
8
7
6
May
5.9
5
7
5
6
June
5.4
5
6
6
6
July
4.3
5
5
4
4
August
4.1
4
4
4
4
September
4.5
4
5
4
5
October
5.8
6
7
6
5
November
6.5
7
6
7
7
December
6.8
7
6
8
7
Average
6.2
7.7
6.0
6.4
5.9
5.9
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
223°
218°
282°
243°
205°
February
203°
212°
212°
273°
228°
March
208°
222°
216°
170°
210°
April
206°
208°
222°
242°
May
076°
193°
133°
205°
June
288°
227°
197°
190°
July
214°
212°
200°
227°
August
247°
245°
162°
229°
September
098°
026°
196°
114°
October
228°
202°
198°
202°
November
218°
220°
207°
201°
December
205°
194°
200°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.