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
79.4
72
79
86
79
82
February
84.2
95
97
85
85
74
March
88.9
87
85
98
94
85
April
93.5
93
93
95
93
May
92.3
94
93
93
93
June
94.0
84
97
95
97
July
95.4
95
95
95
95
August
95.0
96
91
97
96
September
94.9
96
95
96
95
October
90.8
91
97
85
85
November
88.2
93
88
91
92
December
87.6
86
78
90
92
Average
90.1
84.7
90.9
92.2
91.7
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
5.0
3
8
3
4
8
February
8.8
12
12
8
2
6
March
13.2
15
13
15
16
15
April
18.1
19
16
18
17
May
23.7
23
25
22
22
June
28.0
27
29
28
29
July
29.9
29
30
29
31
August
28.7
29
29
30
28
September
26.4
27
25
26
25
October
19.8
19
19
21
18
November
11.7
14
13
11
15
December
8.3
10
7
12
7
Average
17.5
10.0
19.0
18.6
18.4
18.4
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
-3.5
-3
1
-6
-2
0
February
-1.4
1
1
-2
-5
-2
March
2.7
4
2
4
4
5
April
7.3
7
7
7
7
May
13.4
12
14
11
12
June
17.6
16
18
19
18
July
20.3
20
21
20
21
August
19.2
19
19
20
19
September
16.2
16
15
16
15
October
9.8
10
7
13
9
November
2.4
3
4
1
5
December
0.1
2
1
3
-1
Average
7.9
0.5
9.0
8.8
9.0
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.0
28
15
16
14
18
February
14.6
5
5
22
16
27
March
11.6
10
15
8
5
11
April
9.5
6
13
11
11
May
8.6
8
8
7
12
June
4.4
5
1
8
2
July
4.5
3
10
5
4
August
4.7
3
7
6
4
September
5.6
3
4
8
3
October
7.7
7
4
9
10
November
9.8
8
11
8
9
December
11.3
12
12
9
8
Average
9.5
14.1
7.3
9.0
8.5
9.3
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
8.7
9
8
9
8
8
February
9.3
9
10
9
9
9
March
10.1
10
11
11
9
10
April
9.4
9
10
9
10
May
8.0
8
8
7
8
June
7.5
8
7
7
8
July
6.5
7
7
6
6
August
6.4
7
7
6
6
September
6.8
6
7
7
7
October
7.9
8
9
8
7
November
8.3
8
8
8
9
December
8.3
8
8
9
8
Average
8.2
9.6
8.1
8.3
7.7
7.9
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
237°
236°
277°
254°
229°
February
248°
230°
235°
329°
265°
March
240°
248°
239°
222°
248°
April
241°
222°
240°
264°
May
040°
186°
244°
254°
June
324°
260°
210°
236°
July
244°
243°
268°
259°
August
276°
251°
203°
282°
September
023°
296°
240°
168°
October
255°
232°
215°
212°
November
227°
222°
227°
226°
December
223°
208°
208°
238°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.