Fishcreek Rd Observing Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fishcreek Rd Observing Site clear sky chart from 2005-11-06 to 2024-01-31.

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
32%
23467
14%
75131
9%
23416
38%
23416
17%
54042

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
10%
758
9%
2459
2%
757
17%
757
8%
2002
January11th to 20thNight
12%
760
7%
2470
4%
760
16%
760
6%
2071
January21st to endNight
14%
835
8%
2711
4%
835
19%
835
7%
2245
February1st to 10thNight
14%
720
7%
2340
3%
720
19%
720
9%
1901
February11th to 20thNight
16%
702
9%
2227
4%
700
22%
700
9%
1776
February21st to endNight
13%
592
11%
1776
2%
592
22%
592
11%
1398
March1st to 10thNight
20%
720
15%
2023
7%
720
27%
720
16%
1499
March11th to 20thNight
26%
720
17%
1980
9%
720
33%
720
19%
1418
March21st to endNight
26%
792
15%
2178
9%
792
31%
792
17%
1616
April1st to 10thNight
24%
720
12%
1940
5%
720
29%
720
19%
1416
April11th to 20thNight
27%
587
17%
1651
7%
587
35%
587
21%
1173
April21st to endNight
29%
540
17%
1620
7%
540
37%
540
21%
1112
May1st to 10thNight
33%
540
12%
1620
7%
540
37%
540
18%
1178
May11th to 20thNight
41%
531
16%
1593
11%
531
46%
531
22%
1089
May21st to endNight
52%
542
15%
1705
12%
542
57%
542
30%
1039
June1st to 10thNight
45%
360
15%
1440
16%
360
53%
360
22%
864
June11th to 20thNight
49%
360
17%
1440
18%
360
58%
360
22%
852
June21st to endNight
49%
360
17%
1440
18%
360
57%
360
23%
832
July1st to 10thNight
63%
524
14%
1574
14%
524
65%
524
31%
980
July11th to 20thNight
61%
522
18%
1566
16%
522
64%
522
34%
939
July21st to endNight
60%
591
17%
1672
14%
558
63%
558
30%
1045
August1st to 10thNight
64%
537
18%
1600
15%
534
65%
534
33%
961
August11th to 20thNight
62%
534
20%
1598
16%
534
64%
534
30%
997
August21st to endNight
59%
620
22%
1808
16%
620
62%
620
33%
1102
September1st to 10thNight
55%
720
21%
1884
13%
720
58%
720
31%
1230
September11th to 20thNight
60%
720
26%
1980
19%
720
64%
720
37%
1185
September21st to endNight
45%
720
21%
1980
17%
720
49%
720
27%
1319
October1st to 10thNight
43%
720
19%
2104
16%
720
48%
720
28%
1348
October11th to 20thNight
30%
720
16%
2160
11%
720
38%
720
19%
1516
October21st to endNight
25%
792
16%
2376
10%
792
33%
792
16%
1742
November1st to 10thNight
33%
740
19%
2396
14%
740
42%
740
21%
1571
November11th to 20thNight
20%
760
15%
2499
9%
760
28%
760
13%
1840
November21st to endNight
18%
760
11%
2660
8%
760
24%
760
11%
2022
December1st to 10thNight
15%
760
6%
2660
4%
760
18%
760
8%
2146
December11th to 20thNight
15%
759
7%
3269
3%
759
21%
759
6%
2546
December21st to endNight
12%
829
4%
4732
2%
817
18%
817
4%
4072

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
16%10%48%6%35%5%5%7%30%
74754
Night
16%11%47%6%3445%6%31%
75367
TransparencyDay
53%6%12%18%10%1
74475
Night
53%6%12%18%11%1
75165
SeeingDay
21%16%28%20%11%4
13534
Night
21%13%28%26%11%1
23480

By Month

Percentage Cloud Cover SE (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
18%16%8%11%8%6%5%5%3416%
1706
11th to 20thDay
18%19%9%12%8%45%34413%
1710
21st to endDay
18%18%9%14%9%345%3411%
1872
February1st to 10thDay
18%17%8%11%9%45%33418%
1620
11th to 20thDay
16%13%8%13%9%5%5%5%45%18%
1618
21st to endDay
18%15%5%12%7%3435%5%22%
1480
March1st to 10thDay
19%11%6%8%7%24347%27%
1935
11th to 20thDay
17%15%6%9%5%345%46%28%
1980
21st to endDay
23%12%5%8%5%34445%26%
2178
April1st to 10thDay
15%13%46%6%45%45%7%31%
2020
11th to 20thDay
18%11%47%6%35%45%6%32%
2272
21st to endDay
21%10%46%6%3435%6%32%
2340
May1st to 10thDay
17%10%36%7%46%5%6%7%29%
2340
11th to 20thDay
19%9%36%5%45%5%6%6%32%
2301
21st to endDay
11%5%36%6%45%6%7%9%38%
2567
June1st to 10thDay
15%5%36%6%35%5%6%8%37%
2520
11th to 20thDay
13%7%36%6%46%5%6%8%37%
2520
21st to endDay
12%425%6%35%6%7%10%39%
2515
July1st to 10thDay
10%7%36%5%35%6%6%8%40%
2340
11th to 20thDay
12%5%25%7%46%6%7%10%38%
2340
21st to endDay
11%5%35%6%37%6%7%9%37%
2547
August1st to 10thDay
10%6%26%7%46%6%7%9%38%
2327
11th to 20thDay
11%6%26%7%47%7%8%9%33%
2303
21st to endDay
10%6%26%7%46%6%7%11%36%
2529
September1st to 10thDay
14%6%25%6%4445%7%41%
2072
11th to 20thDay
11%6%26%6%35%6%5%9%41%
1980
21st to endDay
19%8%36%434447%38%
1980
October1st to 10thDay
16%7%36%6%35%5%5%8%37%
1854
11th to 20thDay
21%9%37%5%35%46%5%32%
1800
21st to endDay
23%10%48%5%35%446%26%
1980
November1st to 10thDay
12%10%47%6%345%5%7%38%
1677
11th to 20thDay
19%15%48%6%2445%6%29%
1677
21st to endDay
20%14%8%9%5%36%5%5%6%20%
1520
December1st to 10thDay
18%20%7%12%7%3444417%
1520
11th to 20thDay
18%17%8%15%6%34446%15%
1910
21st to endDay
27%23%8%10%7%3333410%
2904
January1st to 10thNight
19%15%7%13%8%3444419%
2459
11th to 20thNight
20%19%6%12%8%4433417%
2470
21st to endNight
18%18%7%12%8%35%43418%
2711
February1st to 10thNight
21%15%7%10%8%4445%419%
2340
11th to 20thNight
17%14%5%11%8%36%5%45%21%
2225
21st to endNight
22%12%5%9%7%35%34425%
1776
March1st to 10thNight
17%11%5%8%6%34446%31%
2023
11th to 20thNight
18%9%46%5%35%46%7%33%
1980
21st to endNight
19%11%47%6%34445%31%
2178
April1st to 10thNight
16%11%5%7%6%35%5%5%7%31%
1940
11th to 20thNight
16%10%36%5%345%6%7%34%
1651
21st to endNight
15%9%37%5%45%5%6%7%36%
1620
May1st to 10thNight
17%9%46%7%36%5%5%6%32%
1620
11th to 20thNight
15%9%36%4346%6%8%36%
1592
21st to endNight
10%5%24435%5%8%12%41%
1704
June1st to 10thNight
10%6%35%6%36%6%5%7%43%
1440
11th to 20thNight
11%6%16%5%35%6%7%8%42%
1440
21st to endNight
12%5%25%5%45%5%9%10%41%
1440
July1st to 10thNight
8%6%26%5%445%5%7%48%
1619
11th to 20thNight
9%325%5%35%6%6%10%47%
1620
21st to endNight
9%5%35%5%45%5%7%9%43%
1771
August1st to 10thNight
8%5%246%35%5%6%8%47%
1611
11th to 20thNight
10%7%36%5%346%5%8%45%
1598
21st to endNight
9%5%25%5%345%6%7%47%
1808
September1st to 10thNight
12%6%25%5%35%45%8%45%
1884
11th to 20thNight
10%5%25%5%2345%8%51%
1980
21st to endNight
14%7%36%6%2445%7%41%
1980
October1st to 10thNight
14%6%25%5%246%6%7%43%
2104
11th to 20thNight
19%7%37%6%35%45%7%34%
2160
21st to endNight
24%10%36%5%245%46%30%
2376
November1st to 10thNight
15%9%35%4446%5%6%39%
2396
11th to 20thNight
17%14%5%7%5%35%447%28%
2499
21st to endNight
20%15%5%7%5%45%45%6%23%
2660
December1st to 10thNight
21%18%7%10%6%34335%19%
2660
11th to 20thNight
17%19%7%10%6%34345%21%
3285
21st to endNight
27%21%8%9%6%34445%11%
4747

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
73%410%10%3
1707
11th to 20thDay
75%5%11%8%2
1710
21st to endDay
76%5%8%8%3
1872
February1st to 10thDay
71%49%12%5%
1620
11th to 20thDay
68%5%8%12%6%
1627
21st to endDay
64%5%11%13%6%1
1480
March1st to 10thDay
58%5%11%20%6%
1935
11th to 20thDay
57%5%10%16%9%1
1980
21st to endDay
59%5%8%17%9%1
2178
April1st to 10thDay
52%6%12%18%12%1
2020
11th to 20thDay
52%6%12%16%12%2
2272
21st to endDay
53%5%11%20%10%2
2340
May1st to 10thDay
53%6%11%18%9%1
2340
11th to 20thDay
50%7%11%16%14%2
2305
21st to endDay
41%8%15%23%12%2
2567
June1st to 10thDay
44%7%13%23%13%1
2520
11th to 20thDay
43%7%15%20%14%1
2520
21st to endDay
38%8%13%23%16%2
2515
July1st to 10thDay
41%7%11%24%15%2
2275
11th to 20thDay
40%7%14%24%14%2
2271
21st to endDay
39%9%14%22%14%2
2405
August1st to 10thDay
40%8%13%25%12%1
2314
11th to 20thDay
43%8%16%22%10%2
2303
21st to endDay
40%9%13%21%13%3
2529
September1st to 10thDay
42%6%15%20%15%3
2072
11th to 20thDay
39%8%14%23%15%1
1980
21st to endDay
45%6%10%23%15%1
1980
October1st to 10thDay
44%6%12%22%14%1
1854
11th to 20thDay
52%6%12%20%9%1
1800
21st to endDay
59%413%13%10%1
1980
November1st to 10thDay
46%6%11%22%14%1
1677
11th to 20thDay
57%5%10%18%7%3
1677
21st to endDay
65%6%10%13%6%
1520
December1st to 10thDay
73%410%11%3
1520
11th to 20thDay
71%5%8%13%3
1906
21st to endDay
80%49%6%1
2904
January1st to 10thNight
68%5%9%12%6%
2459
11th to 20thNight
72%5%9%11%2
2470
21st to endNight
71%49%12%31
2711
February1st to 10thNight
68%410%13%4
2340
11th to 20thNight
65%5%9%14%6%
2227
21st to endNight
64%49%14%7%1
1776
March1st to 10thNight
55%5%10%21%8%
2023
11th to 20thNight
50%6%12%19%11%2
1980
21st to endNight
56%48%18%12%2
2178
April1st to 10thNight
51%7%11%17%13%1
1940
11th to 20thNight
48%7%11%17%15%3
1651
21st to endNight
46%6%12%18%14%3
1620
May1st to 10thNight
52%6%10%16%13%3
1620
11th to 20thNight
45%7%11%18%14%4
1593
21st to endNight
34%9%17%24%15%2
1705
June1st to 10thNight
40%7%11%25%15%3
1440
11th to 20thNight
38%7%14%20%18%2
1440
21st to endNight
35%9%13%24%16%2
1440
July1st to 10thNight
35%7%12%23%19%4
1574
11th to 20thNight
31%8%14%26%19%2
1566
21st to endNight
36%8%15%23%15%3
1672
August1st to 10thNight
32%8%15%27%18%1
1600
11th to 20thNight
36%7%15%28%12%2
1598
21st to endNight
34%7%14%25%17%4
1808
September1st to 10thNight
37%6%12%25%16%4
1884
11th to 20thNight
31%6%14%26%21%1
1980
21st to endNight
41%7%11%22%18%1
1980
October1st to 10thNight
38%7%14%22%18%1
2104
11th to 20thNight
50%6%11%22%12%1
2160
21st to endNight
54%6%11%19%9%1
2376
November1st to 10thNight
43%7%12%23%13%3
2396
11th to 20thNight
57%5%10%17%8%3
2499
21st to endNight
62%412%16%5%
2660
December1st to 10thNight
68%5%11%11%5%
2660
11th to 20thNight
66%5%13%14%2
3288
21st to endNight
77%5%10%7%1
4747

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
31%24%30%11%3
270
11th to 20thDay
31%27%32%7%2
270
21st to endDay
29%33%28%8%2
294
February1st to 10thDay
34%26%34%6%
240
11th to 20thDay
29%33%31%7%
240
21st to endDay
31%32%31%5%
198
March1st to 10thDay
26%23%34%14%4
375
11th to 20thDay
29%17%36%12%5%1
420
21st to endDay
32%22%26%16%4
462
April1st to 10thDay
23%25%28%16%7%1
420
11th to 20thDay
28%19%25%16%8%3
412
21st to endDay
27%19%30%17%6%1
420
May1st to 10thDay
26%19%29%17%7%2
423
11th to 20thDay
21%15%32%20%9%3
447
21st to endDay
15%9%29%23%18%5%
485
June1st to 10thDay
14%12%33%29%10%2
450
11th to 20thDay
16%12%25%31%13%3
450
21st to endDay
14%10%33%25%14%4
450
July1st to 10thDay
12%6%22%28%22%10%
445
11th to 20thDay
13%7%27%27%20%7%
444
21st to endDay
11%6%27%30%18%7%
488
August1st to 10thDay
13%6%22%27%24%8%
446
11th to 20thDay
15%9%22%27%17%10%
439
21st to endDay
11%6%23%27%22%10%
495
September1st to 10thDay
15%9%22%26%20%8%
450
11th to 20thDay
10%6%21%29%26%9%
450
21st to endDay
22%11%23%22%16%6%
450
October1st to 10thDay
15%10%31%21%20%4
450
11th to 20thDay
24%19%34%16%6%1
450
21st to endDay
32%19%28%18%3
495
November1st to 10thDay
19%25%31%14%10%1
275
11th to 20thDay
31%25%25%15%41
255
21st to endDay
23%27%39%9%1
180
December1st to 10thDay
27%26%31%11%32
180
11th to 20thDay
26%29%33%11%1
180
21st to endDay
33%28%28%10%1
236
January1st to 10thNight
27%22%34%14%4
760
11th to 20thNight
30%23%29%15%3
760
21st to endNight
28%20%30%20%3
835
February1st to 10thNight
29%19%31%19%2
720
11th to 20thNight
27%19%34%18%2
703
21st to endNight
29%21%34%15%2
592
March1st to 10thNight
22%18%35%20%4
720
11th to 20thNight
23%17%31%22%6%1
720
21st to endNight
24%14%31%23%7%
792
April1st to 10thNight
23%15%33%23%6%
720
11th to 20thNight
21%14%35%20%9%1
587
21st to endNight
17%14%36%27%6%
540
May1st to 10thNight
21%10%29%31%9%1
540
11th to 20thNight
19%8%27%35%9%2
531
21st to endNight
13%325%36%20%2
544
June1st to 10thNight
11%433%39%13%1
360
11th to 20thNight
13%5%25%43%13%1
360
21st to endNight
12%5%27%38%18%
360
July1st to 10thNight
9%315%40%29%4
524
11th to 20thNight
8%420%38%24%4
522
21st to endNight
9%5%17%42%26%2
591
August1st to 10thNight
8%316%42%27%3
537
11th to 20thNight
11%217%37%30%3
534
21st to endNight
12%220%33%30%4
620
September1st to 10thNight
14%6%18%34%24%4
720
11th to 20thNight
11%317%37%28%5%
720
21st to endNight
16%9%24%30%18%4
720
October1st to 10thNight
17%8%27%28%19%2
720
11th to 20thNight
23%13%29%26%8%1
720
21st to endNight
28%15%29%23%5%
792
November1st to 10thNight
20%14%29%26%11%
740
11th to 20thNight
25%18%31%18%6%1
760
21st to endNight
29%19%31%16%6%
760
December1st to 10thNight
31%18%31%16%4
760
11th to 20thNight
26%21%32%18%2
760
21st to endNight
30%17%34%17%2
836
Page generated at 2024-01-28 05:26:35. Version ac07

Copyright 2024 Attilla Danko


Fishcreek Rd Observing Site Clear Sky Chart |Charts Home