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
86.8
86
90
55
85
88
February
87.8
92
90
96
72
83
March
88.4
85
89
88
83
91
April
91.9
88
94
93
96
92
May
87.8
97
80
95
88
June
91.3
90
94
91
91
July
95.2
97
94
97
96
August
91.6
94
96
88
86
September
86.3
88
94
94
86
October
87.7
94
88
92
79
November
92.1
96
92
100
93
December
84.9
79
79
93
92
Average
89.5
87.6
91.6
90.4
91.6
88.9
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
8.7
9
11
18
7
10
February
12.5
12
14
14
6
12
March
15.0
17
15
17
18
18
April
20.1
21
23
15
21
19
May
24.1
22
24
24
22
June
28.0
27
28
29
28
July
31.1
31
31
31
33
August
29.6
29
30
30
29
September
26.3
26
26
27
24
October
21.1
22
19
23
21
November
14.5
15
16
14
18
December
10.2
12
9
14
10
Average
19.7
14.6
20.5
21.5
21.1
20.3
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
-1.3
-1
2
9
-2
1
February
1.4
1
3
1
-1
1
March
3.5
4
3
4
7
6
April
7.8
9
9
6
7
6
May
13.0
11
14
11
12
June
16.9
15
17
18
18
July
20.1
21
20
20
21
August
19.2
19
19
20
20
September
16.0
16
15
16
15
October
10.2
9
8
12
10
November
2.9
2
5
2
5
December
0.4
1
0
3
0
Average
8.8
3.4
9.2
10.5
9.9
9.7
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
4.2
4
4
4
4
5
February
4.6
4
4
6
4
5
March
5.0
5
2
6
5
6
April
4.3
4
0
5
5
5
May
3.5
0
4
4
4
June
3.1
1
3
4
3
July
2.9
2
3
3
3
August
2.8
3
3
3
3
September
3.0
2
3
4
3
October
3.5
3
3
4
4
November
3.8
3
3
4
4
December
3.7
2
3
4
5
Average
3.7
4.1
2.1
3.8
4.0
4.1
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
251°
256°
223°
288°
260°
February
255°
234°
228°
288°
239°
March
269°
303°
233°
226°
234°
April
238°
360°
276°
263°
259°
May
360°
251°
258°
255°
June
099°
242°
221°
239°
July
232°
222°
228°
235°
August
247°
223°
230°
225°
September
341°
263°
241°
276°
October
258°
282°
246°
246°
November
254°
254°
265°
232°
December
247°
257°
224°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.