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
85.4
84
85
81
88
94
February
86.6
95
96
89
65
82
March
91.1
91
94
92
95
91
April
94.1
98
95
95
92
May
90.3
90
91
91
90
June
90.9
88
95
94
95
July
91.8
91
86
93
93
August
89.3
89
89
87
92
September
88.7
83
87
88
93
October
88.9
91
92
96
84
November
90.7
93
86
98
91
December
90.4
93
93
95
88
Average
89.9
89.9
90.6
89.8
90.6
90.5
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
7.4
6
11
5
5
10
February
11.5
13
14
11
5
10
March
14.8
17
14
16
17
17
April
20.1
22
19
19
17
May
24.5
23
26
23
22
June
27.7
26
29
28
28
July
30.0
30
29
30
32
August
29.1
28
29
30
30
September
26.6
26
24
26
25
October
20.9
20
19
22
20
November
13.8
15
15
13
17
December
10.0
12
9
14
8
Average
18.8
12.1
20.0
19.5
19.4
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
-2.6
-2
1
-5
-1
1
February
0.7
1
2
-2
-3
0
March
3.1
5
2
3
3
6
April
7.2
7
7
6
6
May
12.9
11
13
10
11
June
16.3
14
16
16
17
July
19.5
19
20
19
21
August
18.6
18
19
20
19
September
15.5
15
14
15
15
October
9.0
9
5
12
9
November
2.2
2
3
1
5
December
0.7
2
2
3
-1
Average
7.8
1.3
8.6
8.3
8.4
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.7
37
25
26
25
23
February
19.7
13
10
22
29
34
March
15.7
16
21
14
7
16
April
11.6
4
13
12
17
May
10.1
10
12
10
15
June
6.5
9
3
8
8
July
4.3
3
9
5
3
August
4.6
6
2
10
3
September
7.2
4
8
9
6
October
9.6
9
8
6
10
November
11.3
8
14
8
9
December
16.9
13
10
8
26
Average
12.6
21.7
9.5
11.0
10.9
13.2
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
5.5
6
5
5
5
5
February
5.7
5
6
6
6
6
March
6.2
6
6
7
6
6
April
5.9
6
6
5
6
May
4.9
4
5
4
5
June
4.4
5
4
4
5
July
4.0
4
4
4
4
August
3.6
4
4
3
4
September
3.7
3
4
4
4
October
4.1
4
4
4
4
November
4.9
5
5
5
5
December
4.7
4
4
5
5
Average
4.9
5.4
4.6
4.6
4.6
4.8
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
243°
237°
257°
264°
241°
February
246°
237°
244°
284°
253°
March
255°
255°
252°
254°
246°
April
257°
255°
269°
260°
May
258°
218°
267°
252°
June
277°
254°
219°
235°
July
236°
222°
248°
232°
August
246°
241°
205°
248°
September
054°
269°
230°
191°
October
233°
253°
228°
245°
November
237°
242°
241°
243°
December
220°
243°
221°
242°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.