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
79.4
73
72
81
83
84
February
82.8
95
95
83
75
71
March
88.2
92
87
90
91
91
April
92.1
88
97
89
92
92
May
91.6
94
91
89
92
June
91.2
85
94
94
95
July
92.0
90
93
92
94
August
92.4
95
94
93
96
September
90.9
89
87
92
97
October
89.5
86
94
86
88
November
88.8
90
85
92
93
December
83.7
88
88
86
81
Average
88.8
86.6
89.6
89.5
89.3
90.2
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
3.0
3
6
1
2
6
February
7.0
9
10
6
2
6
March
10.1
13
9
12
13
12
April
16.0
16
19
15
16
13
May
21.5
21
23
20
19
June
25.4
24
27
27
27
July
27.9
28
28
27
30
August
26.8
26
27
28
28
September
23.5
23
23
23
24
October
17.6
17
16
19
17
November
10.1
11
12
9
14
December
5.7
8
5
9
4
Average
15.5
9.7
17.0
16.5
16.4
16.6
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
-5.5
-3
0
-9
-3
-2
February
-3.3
-1
-2
-5
-6
-2
March
-1.9
3
-1
0
0
3
April
5.0
8
4
4
5
3
May
10.5
8
11
9
9
June
14.8
13
15
16
15
July
17.8
18
18
18
18
August
16.9
17
17
18
18
September
13.7
13
13
14
12
October
8.0
8
5
11
7
November
0.6
0
2
-1
3
December
-2.5
1
-1
1
-2
Average
5.9
1.6
6.8
6.1
6.7
6.8
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
7.7
9
8
8
8
7
February
8.1
7
10
8
7
8
March
8.1
8
9
9
8
8
April
7.5
8
7
7
8
8
May
6.4
5
7
5
8
June
5.8
6
6
5
6
July
5.0
5
6
5
5
August
4.7
5
5
4
6
September
5.1
4
5
7
5
October
6.2
5
6
6
6
November
7.2
7
7
7
7
December
7.1
7
7
7
8
Average
6.7
8.0
6.3
6.6
6.3
6.7
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
260°
261°
271°
270°
269°
February
264°
258°
260°
270°
268°
March
260°
271°
266°
265°
246°
April
261°
254°
266°
281°
285°
May
255°
192°
285°
226°
June
261°
276°
242°
263°
July
256°
251°
265°
263°
August
275°
259°
247°
250°
September
288°
263°
242°
218°
October
258°
244°
244°
246°
November
260°
246°
265°
259°
December
259°
245°
251°
259°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.