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
91.0
92
85
91
88
95
February
88.4
96
91
91
71
91
March
93.0
84
95
93
93
92
April
96.2
91
97
100
97
May
96.7
92
99
99
95
June
97.0
97
98
97
97
July
96.1
98
93
95
98
August
95.8
94
94
98
97
September
95.7
98
94
98
91
October
94.2
96
92
94
90
November
89.3
90
91
96
90
December
87.7
89
89
91
91
Average
93.4
90.1
93.1
93.8
93.6
94.0
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
17.6
17
19
16
17
19
February
20.8
20
23
20
18
20
March
23.0
23
23
23
23
25
April
25.8
26
26
25
26
May
29.3
27
30
29
29
June
31.6
30
32
31
31
July
33.0
34
33
31
34
August
32.5
33
32
31
33
September
30.5
30
29
30
30
October
26.8
26
25
26
28
November
21.0
21
22
19
24
December
18.6
18
20
22
18
Average
25.2
19.9
25.9
25.7
25.1
26.4
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
6.3
6
8
4
7
9
February
9.5
7
12
8
8
9
March
11.0
12
12
11
11
14
April
13.8
15
13
12
15
May
18.4
17
19
16
18
June
22.0
21
22
21
22
July
22.9
24
24
23
25
August
23.4
24
23
24
24
September
21.1
20
20
20
22
October
16.4
15
13
16
19
November
10.2
10
12
7
15
December
8.2
8
10
11
6
Average
14.5
8.4
15.5
15.0
14.6
16.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.2
2
7
4
9
6
February
6.3
7
10
4
11
7
March
4.3
5
6
8
6
4
April
2.8
4
1
2
5
May
2.9
6
1
1
2
June
3.7
3
4
5
3
July
3.5
4
6
4
2
August
4.6
6
7
6
3
September
4.3
5
5
6
6
October
3.7
4
1
5
2
November
7.3
10
10
6
7
December
6.9
10
5
4
3
Average
4.5
4.7
5.9
4.6
5.1
3.8
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
8.2
10
7
9
8
9
February
8.3
8
9
8
8
9
March
8.8
8
9
10
8
8
April
9.0
8
9
9
9
May
8.1
9
8
9
8
June
7.2
8
7
8
8
July
6.5
6
7
7
7
August
6.3
7
6
6
6
September
7.2
7
7
6
7
October
7.2
7
6
6
7
November
7.2
7
8
7
8
December
7.3
8
7
7
7
Average
7.7
8.6
7.6
7.7
7.3
7.7
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
262°
257°
298°
266°
303°
February
252°
247°
187°
306°
259°
March
249°
231°
212°
076°
214°
April
154°
180°
233°
241°
May
049°
176°
164°
176°
June
236°
117°
174°
241°
July
235°
215°
193°
200°
August
178°
144°
163°
195°
September
035°
031°
057°
041°
October
012°
028°
333°
048°
November
006°
019°
348°
030°
December
332°
009°
249°
281°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.