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
81.1
73
83
94
75
74
February
87.4
93
95
82
89
86
March
89.9
92
88
96
90
91
April
93.6
98
95
92
96
May
93.7
97
93
93
91
June
97.0
95
98
95
99
July
95.0
96
93
94
94
August
95.5
89
95
99
96
September
94.7
97
89
96
91
October
88.5
86
89
84
85
November
92.9
96
95
94
96
December
89.6
88
79
89
97
Average
91.3
86.3
92.5
92.1
91.1
91.4
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
5.5
3
9
5
5
7
February
9.7
15
12
9
2
9
March
14.6
18
13
16
16
16
April
20.2
21
20
20
19
May
25.2
26
25
23
23
June
30.3
30
31
30
31
July
32.0
32
33
30
32
August
30.2
30
30
32
30
September
28.2
28
27
29
26
October
20.8
21
21
22
19
November
13.6
15
14
15
17
December
9.9
11
7
14
9
Average
19.0
11.7
20.6
20.2
19.9
19.6
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
-4.4
-5
-1
-7
-2
-1
February
-3.6
0
-1
-6
-8
-2
March
3.1
4
2
3
5
6
April
7.5
6
8
7
7
May
13.8
12
15
12
13
June
18.2
16
18
18
19
July
20.9
20
21
20
22
August
19.4
20
19
20
19
September
15.7
15
13
16
14
October
8.5
9
6
11
7
November
1.5
1
2
1
4
December
-1.1
2
-1
1
-3
Average
7.4
-1.4
8.2
7.8
8.5
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
13
8
5
15
10
February
9.0
3
6
17
13
13
March
9.2
5
12
12
9
9
April
8.1
2
12
10
7
May
5.2
2
7
6
5
June
2.7
1
3
3
5
July
3.8
3
8
4
5
August
2.7
5
3
1
1
September
2.0
1
4
3
2
October
7.1
7
6
9
10
November
4.4
3
1
0
5
December
7.0
11
3
5
4
Average
5.9
6.8
4.7
6.7
6.3
6.0
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
7.3
6
8
8
7
6
February
7.4
8
8
8
8
7
March
8.2
9
8
9
8
7
April
8.0
8
9
7
7
May
6.4
6
7
6
6
June
5.5
6
5
5
6
July
5.0
5
5
5
5
August
4.9
5
5
5
4
September
4.7
4
5
6
5
October
6.7
7
7
7
7
November
6.7
6
8
7
7
December
6.9
7
7
7
6
Average
6.5
7.6
6.4
6.7
6.2
6.1
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
268°
267°
297°
273°
265°
February
294°
247°
274°
331°
307°
March
247°
275°
253°
160°
268°
April
244°
240°
256°
292°
May
025°
195°
249°
300°
June
352°
230°
222°
209°
July
246°
252°
291°
222°
August
274°
249°
208°
303°
September
266°
309°
220°
277°
October
278°
266°
259°
301°
November
252°
242°
256°
232°
December
248°
228°
248°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.