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
January
84.9
84
79
93
February
88.2
97
81
85
March
85.8
81
90
88
85
April
92.6
88
93
97
May
95.8
94
97
98
June
92.5
92
98
88
July
93.1
98
89
93
August
92.0
91
94
91
September
93.7
96
94
92
October
90.9
97
89
87
November
91.8
94
82
98
December
80.9
86
73
81
Average
89.9
86.9
90.7
90.8
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
January
12.6
12
14
12
February
16.6
16
18
15
March
19.8
20
19
20
21
April
23.0
23
23
23
May
26.1
25
28
26
June
29.8
28
32
30
July
31.6
32
32
31
August
31.1
32
31
31
September
28.2
29
28
28
October
23.2
24
22
24
November
17.4
18
17
17
December
14.9
15
12
17
Average
21.8
16.0
23.0
23.3
24.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
2.3
1
5
2
February
4.3
4
7
2
March
7.5
7
7
7
10
April
9.3
10
9
9
May
14.5
14
16
14
June
18.5
17
19
19
July
21.2
21
22
21
August
20.8
21
21
21
September
16.6
17
17
16
October
10.7
10
9
13
November
5.4
5
8
3
December
4.7
3
4
7
Average
10.1
3.9
11.4
11.9
13.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
9.3
12
6
11
February
6.5
7
7
5
March
9.1
10
9
10
8
April
5.4
12
2
3
May
3.5
6
1
4
June
3.3
6
1
4
July
2.5
1
3
3
August
3.0
5
1
3
September
5.0
1
7
7
October
3.1
2
3
5
November
5.7
6
9
3
December
10.8
13
15
7
Average
6.1
9.4
5.8
4.8
4.3
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
January
5.1
6
5
5
February
5.5
6
5
6
March
5.6
5
5
6
6
April
5.2
5
5
5
May
5.1
6
5
5
June
4.2
5
4
4
July
3.4
3
4
3
August
3.6
4
4
3
September
4.2
4
5
4
October
4.1
5
4
4
November
4.6
4
5
4
December
4.1
4
3
4
Average
4.7
5.6
4.6
4.6
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
January
263°
246°
262°
February
260°
243°
266°
March
316°
272°
253°
071°
April
254°
245°
266°
May
009°
259°
273°
June
305°
335°
220°
July
251°
227°
235°
August
275°
204°
107°
September
024°
030°
013°
October
306°
356°
264°
November
018°
006°
332°
December
262°
336°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.