Brandy Creek Boat Ramp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Brandy Creek Boat Ramp clear sky chart from 2005-11-06 to 2024-01-13.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
54%
23213
28%
74740
21%
23157
64%
23157
38%
39680

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
43%
760
17%
2646
13%
756
51%
756
23%
1646
January11th to 20thNight
39%
732
21%
2408
14%
732
50%
732
25%
1494
January21st to endNight
42%
792
26%
2574
18%
792
54%
792
26%
1563
February1st to 10thNight
45%
720
26%
2340
20%
720
56%
720
30%
1359
February11th to 20thNight
40%
701
24%
2270
15%
700
54%
700
28%
1322
February21st to endNight
39%
592
25%
1776
15%
592
51%
592
30%
1048
March1st to 10thNight
36%
720
16%
2026
9%
720
44%
720
22%
1404
March11th to 20thNight
43%
720
22%
1980
13%
720
52%
720
30%
1273
March21st to endNight
38%
792
20%
2151
9%
792
47%
792
29%
1361
April1st to 10thNight
38%
720
22%
1800
8%
720
46%
720
32%
1170
April11th to 20thNight
42%
711
27%
1779
8%
711
52%
711
39%
1059
April21st to endNight
49%
692
28%
1772
11%
692
57%
692
51%
947
May1st to 10thNight
47%
540
29%
1620
14%
540
59%
540
46%
791
May11th to 20thNight
53%
372
27%
1434
23%
372
63%
372
39%
651
May21st to endNight
49%
388
25%
1552
20%
388
62%
388
35%
714
June1st to 10thNight
53%
360
22%
1440
20%
360
66%
360
35%
667
June11th to 20thNight
53%
360
33%
1440
29%
360
74%
360
57%
501
June21st to endNight
68%
360
34%
1440
39%
360
80%
360
64%
487
July1st to 10thNight
79%
350
35%
1400
44%
350
86%
350
72%
440
July11th to 20thNight
81%
352
37%
1396
46%
352
86%
352
68%
460
July21st to endNight
88%
591
40%
1674
34%
558
92%
558
82%
632
August1st to 10thNight
85%
537
39%
1602
32%
534
88%
534
75%
637
August11th to 20thNight
83%
556
42%
1624
29%
556
87%
556
77%
644
August21st to endNight
85%
792
44%
1980
27%
792
88%
792
86%
854
September1st to 10thNight
79%
720
46%
1800
26%
720
85%
720
84%
786
September11th to 20thNight
78%
720
44%
1800
30%
720
83%
720
72%
862
September21st to endNight
68%
720
39%
2060
32%
720
78%
720
65%
918
October1st to 10thNight
62%
720
32%
2160
26%
720
74%
720
54%
986
October11th to 20thNight
62%
720
38%
2160
30%
720
78%
720
54%
1010
October21st to endNight
57%
792
37%
2376
28%
792
71%
792
48%
1179
November1st to 10thNight
57%
740
28%
2328
24%
740
66%
740
35%
1292
November11th to 20thNight
51%
760
22%
2579
16%
760
61%
760
32%
1435
November21st to endNight
49%
760
25%
2660
18%
760
60%
760
33%
1396
December1st to 10thNight
46%
760
23%
2660
17%
760
57%
760
27%
1540
December11th to 20thNight
39%
760
19%
3223
14%
759
50%
759
17%
2190
December21st to endNight
37%
831
14%
4810
14%
817
49%
817
13%
2962

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
11%313323346%62%
74719
Night
13%413323346%58%
75039
TransparencyDay
25%28%20%24%20%
74434
Night
29%29%20%23%16%
74845
SeeingDay
13%10%25%31%18%5%
13954
Night
14%6%21%34%22%2
23222

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
25%5%14335%46%8%36%
1519
11th to 20thDay
22%6%24323346%48%
1609
21st to endDay
18%7%25%434346%46%
1782
February1st to 10thDay
19%5%234345%5%6%45%
1620
11th to 20thDay
15%6%1332335%7%52%
1578
21st to endDay
18%6%24325%45%7%45%
1480
March1st to 10thDay
22%8%35%6%34447%35%
1930
11th to 20thDay
21%6%2332336%9%42%
1980
21st to endDay
22%5%2442336%7%41%
2204
April1st to 10thDay
19%5%25%33446%7%44%
2160
11th to 20thDay
14%42442335%6%53%
2129
21st to endDay
6%32442445%7%61%
2186
May1st to 10thDay
7%5%23323446%63%
2340
11th to 20thDay
7%42342335%8%60%
2457
21st to endDay
9%32332435%8%59%
2723
June1st to 10thDay
7%312324448%61%
2520
11th to 20thDay
3211222346%76%
2520
21st to endDay
5%11121322480%
2520
July1st to 10thDay
1111232484%
2520
11th to 20thDay
111111222385%
2512
21st to endDay
111111123484%
2546
August1st to 10thDay
212112235%82%
2328
11th to 20thDay
11111112288%
2275
21st to endDay
11111112388%
2376
September1st to 10thDay
1111112488%
2160
11th to 20thDay
421223346%74%
2160
21st to endDay
3211212235%77%
1896
October1st to 10thDay
6%212212235%74%
1800
11th to 20thDay
8%312212447%67%
1800
21st to endDay
13%224212345%61%
1980
November1st to 10thDay
14%5%23434446%51%
1751
11th to 20thDay
15%5%1432346%8%49%
1596
21st to endDay
12%32343435%7%55%
1520
December1st to 10thDay
22%6%12323337%48%
1520
11th to 20thDay
34%5%25%32345%6%31%
1928
21st to endDay
28%6%2342445%6%37%
2794
January1st to 10thNight
24%5%2342345%8%39%
2646
11th to 20thNight
22%5%24423436%45%
2408
21st to endNight
19%6%23333446%46%
2574
February1st to 10thNight
20%414323447%48%
2340
11th to 20thNight
18%5%13324447%48%
2268
21st to endNight
15%5%23434446%49%
1776
March1st to 10thNight
23%8%34324347%38%
2026
11th to 20thNight
19%6%243345%5%9%40%
1980
21st to endNight
20%5%243235%5%6%46%
2151
April1st to 10thNight
16%5%3443435%7%46%
1800
11th to 20thNight
9%423324446%56%
1779
21st to endNight
8%41331245%7%63%
1772
May1st to 10thNight
7%312223348%64%
1620
11th to 20thNight
7%31332445%9%59%
1434
21st to endNight
8%32342335%7%60%
1552
June1st to 10thNight
6%42342346%7%60%
1440
11th to 20thNight
421112245%77%
1440
21st to endNight
32121223381%
1440
July1st to 10thNight
111121122385%
1440
11th to 20thNight
211122232482%
1444
21st to endNight
11111112387%
1773
August1st to 10thNight
211111123384%
1611
11th to 20thNight
11121223385%
1624
21st to endNight
11111122389%
1980
September1st to 10thNight
11111112389%
1800
11th to 20thNight
311212336%77%
1800
21st to endNight
3211212345%76%
2060
October1st to 10thNight
6%21231333473%
2160
11th to 20thNight
7%31221323472%
2160
21st to endNight
11%212222346%65%
2376
November1st to 10thNight
13%42332446%8%51%
2328
11th to 20thNight
14%3233245%6%9%48%
2579
21st to endNight
13%413423447%54%
2660
December1st to 10thNight
23%5%23213347%47%
2660
11th to 20thNight
33%5%2432335%7%34%
3276
21st to endNight
27%7%24423346%37%
4862

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
46%413%24%8%4
1519
11th to 20thDay
40%39%20%16%12%
1609
21st to endDay
42%38%16%23%9%
1782
February1st to 10thDay
40%311%20%18%9%
1620
11th to 20thDay
34%210%23%25%6%
1587
21st to endDay
38%310%22%20%7%
1480
March1st to 10thDay
50%5%10%16%15%5%
1930
11th to 20thDay
40%39%24%19%6%
1980
21st to endDay
41%413%21%17%5%
2204
April1st to 10thDay
39%314%20%19%5%
2160
11th to 20thDay
31%212%24%20%10%
2132
21st to endDay
23%312%28%26%9%
2186
May1st to 10thDay
23%29%23%29%14%
2340
11th to 20thDay
24%29%26%27%13%
2460
21st to endDay
23%211%29%25%9%
2724
June1st to 10thDay
23%39%24%27%14%
2520
11th to 20thDay
11%19%20%34%24%
2520
21st to endDay
12%1314%32%38%
2520
July1st to 10thDay
7%2314%28%46%
2451
11th to 20thDay
7%15%12%28%47%
2437
21st to endDay
7%1111%28%52%
2405
August1st to 10thDay
9%1217%33%38%
2312
11th to 20thDay
6%1211%33%47%
2275
21st to endDay
6%1214%36%41%
2376
September1st to 10thDay
5%1211%24%57%
2160
11th to 20thDay
13%25%21%35%23%
2160
21st to endDay
12%16%19%32%29%
1896
October1st to 10thDay
16%26%21%28%28%
1800
11th to 20thDay
19%38%20%27%23%
1800
21st to endDay
26%19%21%21%21%
1980
November1st to 10thDay
34%29%25%18%12%
1751
11th to 20thDay
33%415%23%16%9%
1596
21st to endDay
31%210%21%24%11%
1520
December1st to 10thDay
39%28%19%22%10%
1520
11th to 20thDay
56%28%17%14%4
1928
21st to endDay
50%311%21%13%3
2794
January1st to 10thNight
43%416%21%11%5%
2646
11th to 20thNight
42%410%18%15%12%
2408
21st to endNight
41%38%16%24%8%
2574
February1st to 10thNight
38%29%23%20%9%
2340
11th to 20thNight
37%39%21%24%7%
2270
21st to endNight
36%311%21%23%7%
1776
March1st to 10thNight
49%410%16%17%5%
2026
11th to 20thNight
41%310%22%18%6%
1980
21st to endNight
39%313%25%16%4
2151
April1st to 10thNight
39%315%20%17%7%
1800
11th to 20thNight
29%313%24%20%10%
1779
21st to endNight
21%313%32%25%6%
1772
May1st to 10thNight
21%210%24%33%10%
1620
11th to 20thNight
23%313%26%25%10%
1434
21st to endNight
24%412%33%20%7%
1552
June1st to 10thNight
25%412%23%28%9%
1440
11th to 20thNight
11%18%24%35%21%
1440
21st to endNight
11%15%16%37%30%
1440
July1st to 10thNight
7%1316%33%40%
1400
11th to 20thNight
9%2410%30%45%
1396
21st to endNight
6%1211%30%50%
1674
August1st to 10thNight
8%2220%38%30%
1602
11th to 20thNight
7%1215%33%40%
1624
21st to endNight
5%1217%34%40%
1980
September1st to 10thNight
5%1211%27%55%
1800
11th to 20thNight
10%25%22%37%23%
1800
21st to endNight
13%26%21%26%33%
2060
October1st to 10thNight
17%26%18%29%28%
2160
11th to 20thNight
18%26%23%25%25%
2160
21st to endNight
23%28%21%24%21%
2376
November1st to 10thNight
32%312%23%19%12%
2328
11th to 20thNight
32%5%14%23%17%9%
2579
21st to endNight
31%210%23%22%12%
2660
December1st to 10thNight
39%39%19%22%9%
2660
11th to 20thNight
53%27%16%19%3
3276
21st to endNight
50%212%19%14%3
4862

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
40%8%22%20%8%2
180
11th to 20thDay
30%7%24%23%11%4
315
21st to endDay
22%10%21%28%14%4
374
February1st to 10thDay
21%12%22%25%18%2
340
11th to 20thDay
23%13%32%23%9%1
337
21st to endDay
21%11%30%27%9%1
346
March1st to 10thDay
30%16%27%19%6%1
420
11th to 20thDay
28%11%25%23%12%2
420
21st to endDay
25%15%25%24%10%1
462
April1st to 10thDay
25%16%23%26%10%1
420
11th to 20thDay
20%17%28%22%10%3
412
21st to endDay
9%19%30%25%13%5%
420
May1st to 10thDay
11%18%32%24%13%3
423
11th to 20thDay
12%13%27%28%14%5%
448
21st to endDay
9%14%24%33%16%4
485
June1st to 10thDay
8%13%23%31%21%4
450
11th to 20thDay
7%17%29%31%14%2
450
21st to endDay
47%26%34%24%5%
450
July1st to 10thDay
15%27%42%20%5%
446
11th to 20thDay
320%44%25%8%
444
21st to endDay
216%46%27%8%
487
August1st to 10thDay
2222%38%26%10%
447
11th to 20thDay
25%18%37%28%11%
437
21st to endDay
2420%39%27%7%
495
September1st to 10thDay
2322%39%28%6%
450
11th to 20thDay
46%21%40%21%7%
450
21st to endDay
48%28%35%21%4
450
October1st to 10thDay
6%12%25%29%22%6%
450
11th to 20thDay
8%6%26%32%22%6%
450
21st to endDay
16%8%24%27%20%5%
495
November1st to 10thDay
18%7%23%27%21%4
347
11th to 20thDay
16%427%27%19%6%
216
21st to endDay
14%9%28%31%16%3
180
December1st to 10thDay
26%10%24%18%16%5%
180
11th to 20thDay
28%5%25%25%12%6%
180
21st to endDay
21%10%27%26%14%3
198
January1st to 10thNight
26%5%22%28%16%3
760
11th to 20thNight
23%8%23%31%12%3
732
21st to endNight
22%5%23%30%17%3
792
February1st to 10thNight
21%6%22%34%16%2
720
11th to 20thNight
21%8%24%30%13%3
704
21st to endNight
19%8%27%34%10%1
592
March1st to 10thNight
28%8%22%27%13%2
720
11th to 20thNight
23%5%22%31%17%1
720
21st to endNight
21%11%24%31%12%1
792
April1st to 10thNight
18%11%28%28%14%2
720
11th to 20thNight
14%10%29%32%14%2
711
21st to endNight
9%9%30%33%18%1
692
May1st to 10thNight
10%10%29%33%17%1
540
11th to 20thNight
9%7%25%35%23%1
372
21st to endNight
9%8%26%35%21%1
389
June1st to 10thNight
8%8%27%38%20%1
360
11th to 20thNight
6%9%31%38%17%1
360
21st to endNight
4222%48%24%1
360
July1st to 10thNight
1116%46%35%2
350
11th to 20thNight
1114%41%39%3
352
21st to endNight
18%41%46%5%
591
August1st to 10thNight
229%36%45%5%
537
11th to 20thNight
2113%40%41%4
556
21st to endNight
2110%40%44%3
792
September1st to 10thNight
1216%41%37%3
720
11th to 20thNight
4313%38%39%4
720
21st to endNight
46%19%36%32%4
720
October1st to 10thNight
6%8%20%36%27%3
720
11th to 20thNight
8%422%35%27%4
720
21st to endNight
13%5%22%33%22%4
792
November1st to 10thNight
13%6%18%36%24%3
740
11th to 20thNight
16%423%38%18%1
760
21st to endNight
15%6%24%35%18%2
760
December1st to 10thNight
26%421%33%13%3
760
11th to 20thNight
28%5%22%30%14%2
760
21st to endNight
25%6%26%31%12%1
836
Page generated at 2024-01-10 16:35:20. Version ac07

Copyright 2024 Attilla Danko


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