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
86.2
83
81
89
86
87
February
83.9
95
87
88
69
85
March
89.3
83
91
88
91
79
April
91.9
86
95
95
91
May
90.9
89
93
94
93
June
82.8
89
97
89
96
July
92.6
95
92
88
96
August
91.3
96
83
91
90
September
90.9
95
92
88
83
October
89.8
93
92
85
88
November
87.6
94
88
98
87
December
82.1
88
69
80
88
Average
88.2
86.7
90.5
89.7
88.2
88.9
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
13.3
12
16
12
12
14
February
17.1
17
19
17
13
14
March
19.4
20
20
20
21
21
April
23.0
23
23
23
22
May
26.9
25
28
26
26
June
30.0
29
32
30
29
July
31.6
32
32
31
32
August
30.8
32
30
31
31
September
28.5
28
28
28
27
October
23.9
23
23
24
24
November
17.7
18
18
18
20
December
14.4
15
14
18
13
Average
21.7
16.2
23.3
23.4
22.7
22.9
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
2.3
1
4
0
2
4
February
5.5
4
7
3
3
4
March
7.2
8
7
6
8
11
April
9.5
10
9
9
9
May
14.6
15
15
13
13
June
18.6
17
19
19
18
July
20.5
21
21
20
21
August
20.5
21
21
21
21
September
17.2
17
16
17
18
October
11.8
11
8
13
13
November
5.5
6
7
3
8
December
4.0
3
6
6
1
Average
10.1
3.9
11.4
11.2
11.2
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
6
8
10
12
12
February
7.5
5
8
9
7
18
March
7.1
12
8
5
6
13
April
4.5
7
3
3
4
May
4.3
5
1
3
3
June
3.8
3
1
6
3
July
2.4
2
2
4
2
August
5.0
4
2
6
5
September
3.6
2
2
5
9
October
4.7
5
2
9
2
November
6.1
10
6
1
4
December
10.4
7
13
8
7
Average
5.9
8.0
5.5
3.9
5.6
6.1
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
5.7
6
6
6
6
6
February
6.0
7
7
6
6
6
March
6.3
6
6
7
7
7
April
5.6
6
6
6
6
May
5.4
6
6
6
6
June
4.6
5
5
5
5
July
3.7
4
4
4
4
August
4.0
4
4
5
4
September
4.6
4
5
4
6
October
5.2
5
5
5
6
November
5.2
6
6
5
6
December
5.4
6
5
5
6
Average
5.3
6.4
5.3
5.5
5.2
5.5
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
271°
246°
274°
266°
031°
February
204°
232°
229°
037°
248°
March
022°
227°
219°
127°
220°
April
157°
210°
250°
276°
May
076°
209°
184°
214°
June
269°
090°
175°
226°
July
265°
231°
230°
233°
August
257°
168°
137°
193°
September
068°
064°
086°
072°
October
041°
350°
199°
093°
November
070°
052°
333°
063°
December
207°
114°
221°
281°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.