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
86.9
85
82
85
95
0
February
85.9
89
87
84
79
100
March
94.8
93
98
97
95
April
95.1
93
95
99
May
95.3
93
97
95
100
June
96.5
95
100
97
100
July
95.5
93
93
98
100
August
95.0
95
97
90
100
September
93.9
98
96
91
50
October
93.6
98
95
94
100
November
92.4
97
93
94
0
December
87.1
92
73
89
50
Average
92.0
89.3
93.4
93.2
93.3
88.2
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
9.3
7
13
8
10
16
February
13.9
16
16
13
8
12
March
17.2
19
17
19
19
April
21.6
22
21
21
May
26.9
26
27
25
24
June
29.9
30
32
30
23
July
31.8
32
34
31
27
August
30.6
30
32
31
25
September
28.6
29
29
27
21
October
22.3
23
21
23
14
November
14.9
17
16
15
8
December
12.3
13
12
17
4
Average
20.2
13.9
22.2
22.2
21.4
17.5
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
0.2
-2
3
-3
1
16
February
3.0
4
5
1
-1
12
March
5.8
7
5
6
8
April
9.2
9
9
9
May
15.6
14
16
13
24
June
19.0
17
19
20
22
July
21.6
21
22
21
27
August
20.2
20
19
20
25
September
16.8
16
15
14
21
October
11.3
12
8
14
14
November
3.6
5
4
2
8
December
3.3
3
4
6
4
Average
10.6
3.1
10.6
10.4
10.6
17.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
15
8
5
0
0
February
2.7
8
7
5
0
0
March
1.2
4
3
2
0
April
1.3
6
3
0
May
1.0
5
1
0
0
June
0.6
3
1
0
0
July
1.1
6
2
0
0
August
1.1
6
2
0
0
September
0.7
2
1
1
0
October
0.5
2
1
1
0
November
0.9
2
3
1
0
December
2.3
6
12
1
0
Average
1.9
8.6
4.5
2.4
0.2
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
6.7
6
8
6
7
0
February
7.2
9
8
8
6
6
March
7.4
8
8
8
7
April
7.0
8
7
6
May
5.9
6
7
5
9
June
5.6
5
6
6
8
July
4.9
5
5
5
7
August
4.9
7
5
4
5
September
4.5
4
6
4
0
October
5.4
6
6
5
9
November
5.2
5
5
5
0
December
6.7
6
13
6
9
Average
6.2
7.6
6.2
6.5
5.5
6.5
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
269°
237°
301°
278°
360°
February
331°
230°
251°
307°
239°
March
219°
229°
230°
180°
April
229°
215°
242°
May
324°
216°
222°
200°
June
283°
270°
221°
160°
July
255°
246°
248°
270°
August
276°
234°
283°
326°
September
343°
340°
279°
360°
October
255°
222°
239°
324°
November
269°
266°
233°
360°
December
236°
084°
216°
348°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.