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
92.2
96
86
95
93
95
February
91.5
97
92
94
89
91
March
94.5
89
99
97
94
86
April
96.7
94
96
99
99
May
97.4
98
97
98
99
June
97.3
96
99
98
99
July
96.5
100
98
94
97
August
97.1
98
95
97
96
September
97.8
100
97
98
98
October
96.8
99
99
95
97
November
93.8
97
95
97
94
December
89.8
75
89
95
Average
95.1
93.2
96.5
95.7
95.2
95.7
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
11.7
8
14
10
11
13
February
15.9
18
18
15
13
13
March
18.9
20
18
20
19
20
April
21.7
22
23
17
21
May
22.3
26
5
25
26
June
29.9
29
32
30
30
July
32.1
32
33
31
33
August
31.3
32
31
31
31
September
29.2
29
28
27
27
October
23.6
24
23
23
24
November
17.3
21
18
16
20
December
13.8
13
18
14
Average
21.5
16.5
24.4
21.2
21.8
22.6
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
1.9
-2
4
2
2
4
February
4.6
4
7
2
2
4
March
6.7
8
6
6
5
10
April
7.2
10
9
-6
9
May
11.6
14
1
13
13
June
18.8
18
19
19
19
July
21.2
21
22
21
22
August
20.9
21
21
21
21
September
17.5
17
16
17
17
October
11.4
11
8
13
11
November
4.8
5
6
3
7
December
3.6
6
6
0
Average
10.0
4.2
12.8
10.2
9.6
11.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
7
11
12
9
12
February
9.4
1
9
5
10
20
March
7.3
7
10
3
12
14
April
7.1
12
4
5
6
May
4.1
3
5
4
4
June
5.6
6
3
7
6
July
3.9
4
3
7
3
August
5.2
6
4
8
8
September
5.1
3
5
9
6
October
4.9
3
1
7
4
November
4.0
4
6
1
3
December
12.0
18
9
7
Average
6.2
4.5
6.0
4.6
7.3
7.2
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
5.0
6
4
5
5
5
February
5.1
5
5
5
6
5
March
5.6
5
6
6
5
5
April
5.2
5
5
5
6
May
4.2
4
4
4
4
June
3.6
4
3
4
4
July
3.0
3
3
3
3
August
3.0
3
3
3
3
September
3.3
3
4
3
4
October
3.8
4
4
3
3
November
4.2
3
4
4
5
December
4.2
4
4
4
Average
4.3
5.4
3.9
4.2
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
333°
274°
316°
306°
304°
February
243°
247°
277°
333°
286°
March
287°
336°
241°
028°
240°
April
278°
235°
284°
318°
May
003°
222°
277°
264°
June
300°
336°
205°
244°
July
305°
237°
262°
270°
August
341°
209°
156°
263°
September
035°
006°
344°
065°
October
290°
335°
274°
231°
November
349°
353°
342°
006°
December
238°
210°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.