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
91.1
94
87
84
88
100
February
88.8
86
94
93
87
85
March
90.2
92
92
89
87
84
April
93.9
93
99
99
92
May
90.8
91
91
83
96
June
97.4
96
93
100
99
July
96.4
95
99
98
99
August
93.6
99
77
100
97
September
85.9
98
30
99
99
October
82.9
99
25
97
94
November
89.3
94
71
99
99
December
95.1
92
100
100
93
Average
91.7
90.8
94.2
81.8
94.6
94.6
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
5.3
4
2
3
6
6
February
6.5
9
7
5
4
4
March
11.1
11
10
10
10
12
April
15.5
15
17
16
15
May
19.7
20
22
18
22
June
26.3
22
26
27
28
July
28.7
29
30
29
29
August
27.8
28
28
30
30
September
25.4
25
26
26
26
October
16.5
18
17
18
18
November
10.5
13
9
8
13
December
5.8
8
6
-1
7
Average
15.5
7.9
16.4
16.8
15.8
17.1
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
-7.0
-9
-8
-7
-7
-6
February
-8.9
-4
-7
-10
-10
-8
March
-4.9
-3
-6
-4
-3
-2
April
0.3
-1
1
1
0
May
5.6
7
5
5
6
June
10.8
10
11
12
11
July
13.6
14
14
14
14
August
12.7
13
13
14
14
September
10.1
10
10
11
11
October
1.6
2
3
3
1
November
-3.1
-2
-6
-1
-2
December
-7.4
-5
-8
-8
-6
Average
1.4
-6.9
2.3
2.3
2.6
2.4
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
12
11
6
0
February
7.8
11
5
5
9
12
March
5.9
5
4
13
8
4
April
4.3
4
1
1
7
May
5.1
4
7
10
1
June
2.4
6
2
3
3
July
2.7
3
4
2
3
August
1.7
1
3
1
2
September
2.2
4
2
1
1
October
4.1
2
2
1
4
November
4.2
8
7
0
1
December
3.7
7
1
1
4
Average
4.6
7.6
4.6
4.7
3.5
3.5
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
8
8
9
8
9
February
9.0
8
10
8
9
9
March
10.2
10
10
11
10
10
April
10.4
10
13
11
9
May
10.1
10
12
10
10
June
8.7
8
10
8
8
July
7.6
8
8
7
8
August
7.4
8
7
8
8
September
8.1
7
8
8
8
October
8.4
8
8
9
9
November
8.2
8
10
8
9
December
8.9
9
9
10
10
Average
8.8
8.7
8.4
9.6
8.7
8.8
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
346°
334°
313°
309°
274°
February
256°
298°
160°
246°
344°
March
299°
197°
345°
329°
219°
April
261°
230°
346°
304°
May
072°
205°
137°
144°
June
142°
181°
094°
192°
July
027°
026°
076°
360°
August
105°
093°
173°
117°
September
160°
154°
064°
015°
October
192°
322°
191°
191°
November
321°
093°
297°
214°
December
338°
228°
228°
345°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.