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
84.8
82
78
85
87
88
February
87.4
97
98
91
87
76
March
93.2
92
92
99
98
89
April
95.6
97
96
97
94
May
95.6
97
93
97
96
June
95.2
89
99
95
98
July
96.0
94
93
96
99
August
96.3
98
94
96
98
September
96.3
97
97
97
97
October
93.7
92
99
94
89
November
91.6
92
88
94
95
December
87.4
83
88
91
82
Average
92.9
90.4
92.4
93.9
94.4
92.3
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
3.9
3
7
1
3
7
February
7.6
11
12
6
1
5
March
11.9
14
12
14
15
13
April
17.4
18
16
18
15
May
23.4
23
24
22
21
June
27.8
26
29
29
29
July
29.6
29
29
29
32
August
28.3
28
28
30
29
September
25.9
26
24
26
25
October
19.4
19
19
21
18
November
11.0
13
13
11
14
December
6.9
9
6
10
5
Average
16.7
9.2
18.4
17.7
17.9
17.6
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
-4.9
-3
0
-7
-2
-1
February
-2.2
-1
0
-4
-6
-2
March
1.6
4
1
2
2
4
April
6.4
6
6
7
5
May
12.7
12
14
11
11
June
17.4
15
17
18
18
July
19.9
20
20
20
21
August
18.7
18
19
20
19
September
15.6
15
15
16
14
October
9.6
10
7
13
8
November
1.9
2
3
1
4
December
-1.6
2
0
2
-2
Average
7.2
0.1
8.4
8.0
8.4
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.6
27
27
25
23
21
February
16.5
6
8
20
23
23
March
12.8
10
15
12
5
15
April
10.0
7
12
8
13
May
9.2
10
10
7
15
June
5.4
7
2
7
4
July
4.6
3
9
4
4
August
4.1
5
3
4
4
September
5.3
3
6
5
3
October
7.9
8
2
8
10
November
10.8
9
13
9
13
December
14.1
14
11
9
20
Average
10.4
13.8
9.3
9.8
8.6
11.2
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
8.3
9
8
8
8
8
February
9.0
8
10
9
9
9
March
9.7
10
10
10
10
9
April
9.1
9
10
9
9
May
7.9
7
8
7
9
June
7.4
7
7
8
7
July
6.4
6
7
7
6
August
6.3
7
7
6
6
September
6.4
6
7
7
7
October
7.5
7
9
7
7
November
8.1
8
8
8
9
December
7.7
7
7
8
8
Average
7.9
9.1
7.6
7.9
7.6
7.6
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
245°
237°
254°
261°
237°
February
258°
236°
238°
306°
270°
March
251°
261°
246°
254°
252°
April
241°
238°
252°
278°
May
012°
171°
297°
234°
June
347°
256°
219°
252°
July
238°
245°
265°
255°
August
270°
239°
227°
251°
September
044°
291°
246°
179°
October
265°
245°
210°
231°
November
234°
231°
232°
241°
December
221°
241°
209°
242°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.