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
86.7
79
87
94
87
86
February
90.1
98
98
94
97
76
March
92.7
90
89
99
100
92
April
96.4
97
95
97
97
May
94.6
98
94
96
94
June
95.2
97
98
94
97
July
96.7
96
98
96
98
August
95.0
96
95
94
95
September
93.8
96
92
94
95
October
91.4
94
98
84
88
November
92.1
95
95
93
95
December
91.8
92
84
91
96
Average
92.9
89.1
94.8
95.2
93.5
93.1
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
4.6
4
8
3
3
7
February
8.6
12
13
7
2
6
March
12.4
15
13
15
13
14
April
17.9
19
16
18
17
May
23.5
23
25
22
21
June
27.6
27
28
28
28
July
29.5
30
30
28
31
August
28.5
28
29
30
28
September
26.3
27
25
27
26
October
19.6
20
19
21
18
November
11.4
14
13
11
15
December
7.8
10
7
12
6
Average
17.2
10.1
19.1
18.3
18.1
18.3
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
-3.1
-4
1
-6
-2
-1
February
-2.3
-1
-1
-4
-6
-1
March
1.1
3
1
2
-1
4
April
5.7
5
5
6
5
May
11.7
10
12
9
11
June
16.0
14
15
17
16
July
18.8
19
20
19
20
August
17.5
18
18
19
17
September
14.1
13
14
15
13
October
7.8
7
4
12
7
November
0.9
1
1
0
3
December
-1.0
0
0
1
-2
Average
6.5
-1.4
7.2
7.0
7.8
7.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
5.3
5
5
6
5
5
February
6.0
6
7
6
6
6
March
6.6
7
7
7
6
7
April
6.1
6
6
6
6
May
5.2
5
5
5
5
June
4.5
5
4
5
5
July
3.8
4
4
4
4
August
3.9
4
4
4
4
September
4.1
4
4
5
5
October
4.6
4
6
5
5
November
4.8
5
5
5
6
December
4.5
4
4
5
5
Average
5.0
5.9
4.8
5.1
4.8
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
251°
247°
261°
288°
240°
February
260°
238°
243°
339°
277°
March
253°
250°
238°
256°
265°
April
242°
227°
243°
260°
May
046°
198°
254°
250°
June
357°
251°
215°
233°
July
242°
244°
286°
256°
August
289°
253°
204°
280°
September
040°
285°
244°
200°
October
258°
244°
226°
222°
November
234°
230°
230°
233°
December
232°
240°
229°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.