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
81.3
81
73
84
77
85
February
75.8
93
76
83
65
75
March
86.8
89
88
90
85
75
April
88.5
90
88
95
90
May
90.9
95
89
90
91
June
90.4
90
96
87
91
July
94.0
97
93
90
96
August
92.2
95
90
92
91
September
93.7
98
91
93
91
October
87.0
97
91
83
86
November
88.5
93
99
85
December
79.4
76
80
72
86
Average
87.9
87.7
89.4
89.3
86.1
87.5
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
10.0
9
12
9
9
11
February
14.0
15
16
13
11
11
March
16.9
18
17
18
18
18
April
17.0
21
20
20
19
May
20.0
24
26
23
23
June
23.8
27
16
27
27
July
28.1
30
22
28
30
August
28.8
30
28
29
29
September
26.8
27
26
25
25
October
21.6
22
22
21
22
November
15.3
16
15
18
December
11.7
12
7
15
10
Average
19.0
13.9
21.1
19.4
20.2
20.4
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
1.9
0
5
0
2
4
February
4.7
5
7
3
2
4
March
7.1
9
7
8
9
10
April
6.3
11
8
9
9
May
11.1
15
16
14
13
June
14.4
18
10
19
18
July
19.4
20
15
20
21
August
20.0
21
20
20
20
September
17.3
18
16
17
17
October
11.9
12
11
13
13
November
5.5
8
5
9
December
3.7
4
-1
8
2
Average
9.7
4.7
12.1
10.3
11.5
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
11.2
11
14
8
9
16
February
14.2
5
15
11
16
26
March
9.7
12
11
6
13
17
April
5.6
11
4
5
7
May
3.6
2
4
6
5
June
5.1
2
3
8
6
July
4.4
2
6
11
5
August
6.4
2
5
10
9
September
5.3
1
6
7
9
October
7.0
1
1
14
5
November
6.0
5
1
5
December
11.0
14
6
9
9
Average
7.4
9.3
6.2
5.4
8.9
9.0
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
6.8
9
5
6
6
7
February
6.2
7
5
7
7
5
March
7.0
9
6
7
6
5
April
6.4
6
6
6
7
May
5.2
8
4
5
6
June
4.3
6
4
4
4
July
3.3
5
3
3
3
August
3.4
5
3
3
3
September
4.5
5
5
4
5
October
5.6
7
5
4
5
November
6.0
8
5
7
December
6.1
7
6
4
6
Average
5.6
8.1
6.0
4.9
4.6
5.0
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
259°
336°
344°
344°
333°
February
227°
318°
308°
333°
337°
March
292°
335°
305°
205°
267°
April
265°
283°
345°
349°
May
127°
243°
289°
296°
June
301°
072°
212°
331°
July
294°
341°
339°
350°
August
289°
214°
184°
326°
September
132°
036°
006°
163°
October
211°
004°
341°
189°
November
141°
349°
328°
December
199°
324°
266°
341°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.