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
82.9
77
84
92
84
85
February
88.3
97
97
89
90
79
March
91.0
91
88
98
94
89
April
95.8
96
96
94
99
95
May
94.8
97
96
94
96
June
95.8
94
100
93
98
July
95.6
97
93
91
98
August
95.9
96
95
98
96
September
94.9
97
94
94
92
October
93.5
93
98
92
86
November
92.7
97
92
93
96
December
88.3
88
75
88
97
Average
92.5
90.6
93.7
93.9
92.6
92.2
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
3.6
2
6
2
3
6
February
7.2
11
11
5
-1
5
March
12.0
15
12
14
14
13
April
17.6
19
19
17
17
17
May
23.2
25
25
21
21
June
27.4
27
29
27
29
July
28.8
29
30
28
30
August
27.8
27
28
29
27
September
25.9
26
25
26
25
October
19.0
20
19
21
18
November
10.9
13
12
10
14
December
6.9
9
6
11
5
Average
16.8
11.8
18.7
18.0
17.2
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
-4.5
-4
0
-7
-2
-1
February
-2.2
-1
-1
-4
-6
-2
March
1.9
4
1
2
3
3
April
6.7
9
5
6
7
6
May
13.1
12
14
12
12
June
17.7
15
16
19
19
July
19.3
18
20
19
19
August
17.7
17
18
19
17
September
14.4
13
13
15
13
October
8.0
8
5
11
7
November
1.0
1
1
-1
4
December
-1.0
1
0
1
-2
Average
7.1
1.7
7.3
7.2
8.1
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.8
16
11
7
13
19
February
11.5
3
4
14
14
21
March
8.8
4
9
6
5
10
April
7.1
7
4
5
7
8
May
5.8
2
2
11
6
June
3.5
3
3
7
1
July
3.9
1
5
9
4
August
3.3
1
3
2
5
September
2.7
0
2
6
1
October
5.8
4
4
2
4
November
6.5
3
6
3
8
December
7.1
8
5
5
8
Average
6.8
6.8
3.8
5.0
6.6
7.5
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
8
8
7
February
8.6
8
10
9
8
9
March
9.4
10
10
10
7
10
April
8.9
9
8
10
8
9
May
7.4
7
9
6
7
June
6.4
7
6
6
7
July
4.9
6
5
4
4
August
4.7
5
5
5
4
September
5.3
5
6
6
5
October
7.1
7
9
6
7
November
7.3
7
8
7
8
December
7.7
8
8
8
8
Average
7.2
8.8
7.1
7.5
6.4
6.8
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
237°
241°
274°
241°
224°
February
254°
231°
226°
358°
298°
March
232°
238°
233°
193°
247°
April
233°
227°
213°
248°
259°
May
041°
195°
220°
221°
June
360°
249°
210°
210°
July
235°
234°
291°
239°
August
252°
231°
204°
245°
September
270°
271°
226°
222°
October
248°
231°
224°
218°
November
226°
222°
226°
240°
December
216°
218°
210°
213°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.