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
90.7
94
83
94
82
97
February
86.6
98
84
90
68
89
March
90.6
84
92
88
91
88
April
93.2
93
88
96
100
96
May
90.8
90
87
97
87
June
92.7
91
94
93
91
July
94.1
94
86
95
97
August
90.6
93
87
89
93
September
89.4
89
89
97
84
October
91.4
94
90
92
86
November
89.7
91
92
97
92
December
89.7
91
94
92
89
Average
91.0
91.9
90.2
90.3
91.5
90.6
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
13.8
15
17
12
12
16
February
17.4
16
19
17
13
17
March
19.1
21
20
21
20
21
April
23.8
24
24
24
24
23
May
27.4
25
28
28
25
June
30.0
29
31
30
28
July
32.0
32
32
31
33
August
31.3
32
31
31
31
September
28.7
28
29
29
28
October
24.4
24
23
25
25
November
18.2
18
20
18
21
December
15.4
16
15
19
14
Average
22.9
18.8
23.6
23.7
23.2
23.4
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
2.2
2
5
0
2
5
February
5.0
4
7
4
3
5
March
6.5
8
7
7
8
10
April
10.5
11
11
10
10
9
May
15.6
13
18
13
14
June
19.3
18
19
20
20
July
21.5
22
23
20
22
August
21.7
22
21
22
23
September
17.9
18
18
18
19
October
13.0
11
12
13
14
November
6.3
6
9
4
9
December
3.8
4
4
6
2
Average
11.3
6.1
11.8
12.1
11.6
12.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.7
7
7
7
15
3
February
10.3
6
11
9
20
9
March
7.3
13
7
7
8
8
April
5.6
5
12
3
1
5
May
4.8
8
3
5
6
June
4.5
4
3
6
6
July
4.1
4
6
6
3
August
4.6
3
7
6
5
September
5.7
5
6
4
10
October
4.1
3
4
3
5
November
5.8
5
8
3
5
December
10.9
10
6
7
8
Average
6.3
7.8
6.4
5.4
6.5
5.9
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
6.6
7
6
7
6
8
February
7.3
8
7
8
8
8
March
7.7
7
7
8
8
8
April
7.8
8
7
8
7
8
May
7.2
8
8
7
7
June
6.2
6
6
7
7
July
6.0
5
6
6
6
August
5.4
6
5
5
5
September
5.7
5
6
5
6
October
5.8
5
6
6
6
November
5.9
6
7
6
6
December
6.1
6
6
6
6
Average
6.6
7.4
6.2
6.6
6.3
6.6
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
222°
231°
311°
294°
252°
February
268°
236°
189°
336°
234°
March
240°
243°
211°
015°
229°
April
222°
172°
221°
244°
232°
May
038°
206°
213°
130°
June
203°
116°
185°
196°
July
196°
211°
199°
207°
August
208°
178°
182°
197°
September
009°
050°
102°
028°
October
359°
022°
236°
047°
November
023°
054°
344°
084°
December
083°
025°
240°
238°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.