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
82.1
80
93
80
87
February
87.6
99
95
86
93
76
March
90.9
93
91
97
95
84
April
95.3
96
93
96
96
May
93.7
99
92
94
97
June
95.4
93
99
96
95
July
95.6
96
95
95
97
August
94.5
94
92
100
96
September
94.5
97
96
93
October
92.3
94
96
84
November
93.4
92
94
94
93
December
89.1
88
77
89
97
Average
92.7
94.9
93.4
93.6
93.0
91.9
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
3.7
7
2
2
4
February
6.8
11
11
4
0
4
March
11.1
13
11
14
14
12
April
17.0
19
17
17
15
May
22.0
24
25
21
20
June
27.5
29
30
27
28
July
28.0
29
30
27
29
August
27.3
28
28
24
27
September
26.3
27
25
24
October
18.9
20
19
17
November
11.6
14
13
11
14
December
7.2
9
6
11
5
Average
16.4
12.0
18.8
18.6
14.8
16.8
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
-4.9
1
-7
-3
0
February
-1.0
3
1
-4
-7
-1
March
2.3
6
3
3
3
4
April
6.2
8
7
6
5
May
10.6
13
15
8
10
June
13.6
18
18
12
13
July
15.4
20
21
14
13
August
13.4
18
18
10
10
September
12.9
15
15
9
October
8.2
9
7
6
November
2.1
3
3
1
3
December
-1.6
2
1
2
-3
Average
6.3
4.5
9.0
8.8
4.0
6.0
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
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
October
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
7.0
7
7
6
7
February
7.3
7
8
6
6
7
March
8.2
9
8
8
7
8
April
7.7
7
8
8
7
May
6.7
6
7
6
7
June
6.0
6
5
6
6
July
4.9
5
5
4
3
August
4.4
5
5
4
2
September
4.8
4
5
4
October
6.2
5
7
5
November
6.7
6
7
6
7
December
6.6
6
6
7
6
Average
6.6
8.6
5.8
6.4
6.1
5.7
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
260°
278°
225°
239°
February
233°
237°
243°
357°
275°
March
229°
151°
237°
180°
255°
April
232°
220°
256°
273°
May
069°
181°
220°
242°
June
064°
251°
217°
241°
July
244°
243°
238°
265°
August
228°
230°
033°
355°
September
123°
297°
204°
October
249°
237°
231°
November
241°
223°
238°
234°
December
221°
206°
217°
244°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.