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
79.0
70
85
94
81
43
February
77.8
89
38
82
75
88
March
91.9
92
87
97
94
90
April
95.0
98
93
95
97
May
85.6
96
91
96
89
June
83.1
91
99
96
98
July
82.2
94
94
93
98
August
82.3
91
94
97
98
September
81.4
93
92
98
94
October
78.7
92
90
90
93
November
80.5
95
94
97
97
December
76.5
87
87
80
99
Average
83.3
83.9
88.3
92.6
91.7
91.1
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
4.6
2
8
4
5
3
February
8.3
15
5
7
3
7
March
14.1
18
13
16
16
15
April
19.7
22
19
20
19
May
23.3
27
26
24
23
June
26.6
31
32
31
31
July
27.3
32
33
31
32
August
26.0
30
31
32
30
September
24.2
28
27
30
27
October
18.1
21
21
23
19
November
11.7
15
14
15
16
December
8.0
10
8
14
9
Average
16.9
11.5
20.1
20.0
20.3
19.2
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
-4.6
-5
0
-7
-2
-1
February
-3.8
0
-1
-5
-5
-2
March
3.1
4
2
3
5
5
April
7.5
7
7
8
7
May
12.8
14
15
13
12
June
16.1
16
19
19
20
July
18.1
20
22
21
22
August
16.6
20
20
21
19
September
13.2
15
15
16
15
October
7.7
9
7
13
7
November
1.6
1
2
2
5
December
-1.6
2
0
2
-2
Average
6.7
-1.7
8.7
8.3
9.4
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
13
7
5
14
3
February
5.0
4
1
10
4
8
March
7.4
5
10
8
7
8
April
5.6
0
10
8
5
May
4.1
1
8
5
4
June
2.0
3
2
1
4
July
2.7
2
8
3
3
August
1.6
5
1
0
1
September
1.4
1
4
3
1
October
5.9
8
6
10
6
November
4.3
2
4
1
7
December
5.1
12
4
6
4
Average
4.6
7.1
4.1
5.9
5.0
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
2020
January
8.1
8
9
9
8
4
February
7.7
9
4
9
6
8
March
9.7
10
10
10
10
9
April
10.0
11
11
9
10
May
7.5
8
10
8
7
June
5.8
7
6
7
7
July
4.7
6
5
5
5
August
4.6
6
5
5
5
September
5.2
5
6
7
6
October
7.2
9
8
9
8
November
6.9
7
9
8
9
December
7.0
8
8
8
7
Average
7.2
9.0
7.2
7.9
7.4
7.1
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
276°
270°
306°
290°
292°
February
281°
238°
310°
351°
351°
March
241°
273°
240°
132°
247°
April
236°
231°
246°
275°
May
076°
162°
158°
317°
June
025°
229°
205°
193°
July
245°
140°
345°
095°
August
326°
184°
158°
048°
September
148°
001°
202°
231°
October
270°
271°
238°
295°
November
250°
237°
241°
206°
December
233°
213°
214°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.