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
86.1
83
82
90
91
84
February
79.3
75
85
82
75
86
March
87.9
64
97
95
92
83
April
94.4
89
96
98
95
May
81.0
13
91
94
95
June
91.5
91
96
86
95
July
82.8
89
100
48
90
August
92.2
91
91
85
94
September
89.5
95
82
83
90
October
90.9
96
96
89
87
November
92.6
97
92
95
93
December
82.0
72
78
83
87
Average
86.3
73.7
82.1
90.6
84.5
90.3
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
10.1
8
13
9
11
13
February
14.5
17
17
14
10
13
March
18.2
19
18
19
20
20
April
21.4
21
22
22
21
May
26.5
26
27
25
25
June
29.7
29
31
30
30
July
31.3
31
33
30
32
August
30.6
31
31
28
31
September
28.4
29
24
27
27
October
23.1
24
22
24
23
November
16.5
18
17
16
19
December
13.5
14
13
18
13
Average
21.1
14.5
22.4
20.6
20.9
22.2
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
-1.7
-3
2
-2
0
3
February
2.8
3
5
-1
-1
3
March
5.7
6
5
5
6
10
April
8.1
8
8
7
8
May
14.4
14
15
12
13
June
18.2
17
18
19
18
July
20.7
20
22
21
21
August
19.9
20
21
18
20
September
15.9
15
11
16
16
October
10.0
9
5
13
11
November
2.9
3
4
1
4
December
2.2
1
4
6
-1
Average
9.1
1.9
9.9
7.5
9.1
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
5.8
6
5
6
6
5
February
6.3
6
7
7
6
7
March
6.5
6
7
7
6
6
April
6.1
6
7
6
6
May
4.7
5
5
5
5
June
4.1
4
4
4
4
July
3.2
3
3
3
3
August
3.4
4
4
3
3
September
3.5
3
4
3
4
October
4.7
5
6
4
4
November
4.9
5
5
5
5
December
5.1
5
5
6
5
Average
4.9
6.1
4.8
5.4
4.8
4.6
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
258°
235°
327°
270°
211°
February
222°
206°
209°
321°
268°
March
203°
234°
201°
141°
219°
April
243°
204°
239°
289°
May
210°
201°
177°
199°
June
268°
248°
189°
209°
July
260°
251°
198°
222°
August
314°
175°
334°
254°
September
135°
007°
158°
185°
October
239°
213°
210°
262°
November
263°
313°
216°
210°
December
215°
196°
200°
236°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.