Hackbart Road Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hackbart Road Hill clear sky chart from 2005-11-05 to

2017-09-12
.

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
34%
14851
13%
46495
9%
14813
39%
14813
17%
33359

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 15thNight
13%
716
7%
2413
3%
716
18%
716
7%
1988
January16th to endNight
16%
768
8%
2496
3%
768
21%
768
8%
2055
February1st to 15thNight
17%
703
6%
2287
2%
701
22%
701
9%
1852
February16th to endNight
21%
631
9%
1978
4%
631
27%
631
12%
1524
March1st to 15thNight
23%
720
12%
2002
6%
720
28%
720
15%
1541
March16th to endNight
32%
768
19%
2112
11%
768
39%
768
22%
1464
April1st to 15thNight
26%
694
14%
1829
6%
694
31%
694
20%
1334
April16th to endNight
38%
540
19%
1620
10%
540
45%
540
23%
1071
May1st to 15thNight
39%
540
16%
1620
10%
540
45%
540
24%
1088
May16th to endNight
44%
385
16%
1508
13%
385
54%
385
25%
854
June1st to 15thNight
49%
360
13%
1398
14%
360
57%
360
24%
837
June16th to endNight
51%
360
15%
1260
15%
360
58%
360
27%
743
July1st to 15thNight
65%
340
19%
1223
23%
340
69%
340
36%
629
July16th to endNight
59%
560
15%
1591
12%
527
62%
527
32%
968
August1st to 15thNight
66%
539
17%
1609
13%
536
69%
536
34%
963
August16th to endNight
59%
591
23%
1737
15%
591
63%
591
33%
1053
September1st to 15thNight
54%
707
20%
1828
12%
707
57%
707
32%
1194
September16th to endNight
54%
657
19%
1815
14%
657
57%
657
31%
1137
October1st to 15thNight
42%
660
16%
1972
13%
660
46%
660
22%
1349
October16th to endNight
24%
704
11%
2120
6%
704
31%
704
14%
1621
November1st to 15thNight
33%
700
16%
2349
14%
700
38%
700
17%
1633
November16th to endNight
22%
720
9%
2520
7%
720
26%
720
10%
1973
December1st to 15thNight
14%
720
4%
2520
2%
720
17%
720
6%
2141
December16th to endNight
10%
768
4%
2688
1%
768
15%
768
4%
2347

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
15%10%47%6%35%45%7%29%
48157
Night
14%9%47%6%3445%7%31%
46670
Cloud CoverDay
15%9%47%6%35%45%7%29%
48167
Night
14%9%47%6%35%45%7%32%
46674
TransparencyDay
53%6%12%17%8%
47850
Night
51%6%12%18%9%1
46495
SeeingDay
19%8%26%24%14%6%
5624
Night
19%9%29%27%11%1
14857

By Month

Percentage Cloud Cover NE (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 15thDay
18%16%8%12%9%345%4414%
1522
16th to endDay
12%17%10%14%9%5%5%435%11%
1728
February1st to 15thDay
15%16%8%12%8%5%5%43413%
1575
16th to endDay
15%15%7%10%8%46%445%17%
1494
March1st to 15thDay
14%13%5%10%7%35%445%24%
1945
16th to endDay
14%11%5%7%6%35%436%29%
2112
April1st to 15thDay
20%12%46%41445%7%28%
2129
16th to endDay
18%10%25%5%22346%37%
2340
May1st to 15thDay
18%8%36%424448%33%
2331
16th to endDay
13%6%25%5%345%5%8%37%
2606
June1st to 15thDay
14%5%25%6%35%5%5%8%36%
2559
16th to endDay
13%5%25%6%35%5%6%9%36%
2700
July1st to 15thDay
9%425%5%36%5%7%8%39%
2661
16th to endDay
10%6%35%5%45%5%6%9%36%
2468
August1st to 15thDay
9%5%36%6%46%6%7%8%35%
2340
16th to endDay
12%6%26%5%35%6%6%9%35%
2452
September1st to 15thDay
14%6%36%5%35%6%6%8%34%
2050
16th to endDay
16%6%245%245%5%7%38%
1815
October1st to 15thDay
19%9%37%5%34445%31%
1658
16th to endDay
26%12%46%6%35%44421%
1749
November1st to 15thDay
14%13%47%5%25%45%6%30%
1507
16th to endDay
17%16%7%9%7%3445%6%16%
1440
December1st to 15thDay
16%19%9%13%8%4443411%
1440
16th to endDay
19%18%10%12%9%344439%
1536
January1st to 15thNight
20%15%6%9%8%45%445%14%
2413
16th to endNight
13%15%9%12%8%45%445%14%
2496
February1st to 15thNight
14%14%8%10%8%46%5%45%18%
2285
16th to endNight
16%10%410%9%45%45%7%21%
1978
March1st to 15thNight
17%9%48%7%3445%7%27%
1990
16th to endNight
14%9%5%6%5%34345%38%
2112
April1st to 15thNight
20%8%36%5%3445%7%31%
1829
16th to endNight
12%7%35%6%35%446%39%
1620
May1st to 15thNight
15%6%36%5%34448%37%
1620
16th to endNight
10%425%43445%7%46%
1506
June1st to 15thNight
11%5%25%435%5%5%8%42%
1398
16th to endNight
11%3235%3345%9%45%
1260
July1st to 15thNight
5%314425%45%7%56%
1296
16th to endNight
7%325%5%345%6%10%46%
1698
August1st to 15thNight
6%3245%245%7%8%47%
1620
16th to endNight
7%5%245%24446%50%
1737
September1st to 15thNight
11%5%25%43445%6%46%
1828
16th to endNight
12%5%2442445%8%44%
1815
October1st to 15thNight
16%6%36%5%3435%7%37%
1972
16th to endNight
23%8%36%7%2445%7%25%
2120
November1st to 15thNight
15%9%46%5%35%447%32%
2349
16th to endNight
18%13%6%8%6%34447%20%
2520
December1st to 15thNight
18%17%8%11%7%345%5%414%
2520
16th to endNight
19%16%8%13%8%34445%10%
2688

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 15thDay
18%17%6%11%8%44445%15%
1522
16th to endDay
13%16%9%14%9%5%5%34412%
1728
February1st to 15thDay
15%15%8%12%8%45%45%414%
1575
16th to endDay
15%16%6%11%8%45%445%18%
1494
March1st to 15thDay
15%13%5%10%7%26%35%424%
1956
16th to endDay
14%10%5%8%7%25%445%30%
2111
April1st to 15thDay
20%11%45%5%2445%7%28%
2129
16th to endDay
18%9%25%423337%37%
2340
May1st to 15thDay
18%8%26%5%24448%34%
2331
16th to endDay
13%6%26%5%45%45%8%38%
2606
June1st to 15thDay
14%6%35%5%35%46%8%37%
2559
16th to endDay
14%5%245%45%6%6%9%36%
2700
July1st to 15thDay
9%5%25%5%35%6%7%9%38%
2661
16th to endDay
11%5%36%5%36%5%6%9%35%
2468
August1st to 15thDay
9%5%27%6%5%6%6%6%8%35%
2340
16th to endDay
11%6%36%5%35%5%7%8%36%
2452
September1st to 15thDay
15%6%25%6%35%46%10%34%
2050
16th to endDay
15%5%25%435%45%8%38%
1815
October1st to 15thDay
19%9%37%6%3435%5%31%
1658
16th to endDay
25%11%48%6%34446%20%
1749
November1st to 15thDay
14%11%47%6%35%45%7%30%
1507
16th to endDay
17%15%8%9%7%345%5%5%18%
1440
December1st to 15thDay
17%17%9%12%8%36%5%3312%
1440
16th to endDay
19%16%9%13%8%4433410%
1536
January1st to 15thNight
21%14%5%9%8%45%446%16%
2413
16th to endNight
14%14%9%11%8%46%445%16%
2496
February1st to 15thNight
14%12%7%10%8%46%35%6%19%
2278
16th to endNight
15%11%5%9%8%35%5%5%6%22%
1978
March1st to 15thNight
18%9%47%7%45%446%27%
2002
16th to endNight
14%9%45%5%24446%38%
2112
April1st to 15thNight
20%7%46%5%24447%32%
1829
16th to endNight
12%7%45%5%345%46%41%
1620
May1st to 15thNight
15%6%35%5%345%48%37%
1619
16th to endNight
11%4245%25%35%7%46%
1506
June1st to 15thNight
11%5%34435%5%5%7%43%
1398
16th to endNight
9%5%245%2446%9%45%
1260
July1st to 15thNight
5%3133245%5%9%55%
1296
16th to endNight
8%325%5%245%5%9%47%
1698
August1st to 15thNight
6%4244245%7%9%48%
1620
16th to endNight
7%6%24434446%50%
1737
September1st to 15thNight
11%415%435%45%6%47%
1828
16th to endNight
13%4144335%5%8%44%
1815
October1st to 15thNight
16%6%36%5%23446%38%
1972
16th to endNight
21%9%37%5%4445%7%26%
2120
November1st to 15thNight
15%8%36%5%25%45%8%33%
2349
16th to endNight
19%11%5%8%7%3445%7%21%
2520
December1st to 15thNight
18%16%7%9%7%36%445%15%
2520
16th to endNight
19%14%7%13%8%45%44410%
2688

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 15thDay
72%5%9%8%3
1523
16th to endDay
74%5%8%7%3
1728
February1st to 15thDay
71%6%8%10%2
1577
16th to endDay
67%411%11%4
1494
March1st to 15thDay
61%5%11%13%7%
1956
16th to endDay
55%5%11%16%10%1
2112
April1st to 15thDay
54%5%11%18%9%
2129
16th to endDay
48%411%20%13%1
2340
May1st to 15thDay
48%6%11%22%10%
2331
16th to endDay
43%6%14%20%12%1
2610
June1st to 15thDay
43%6%13%23%11%
2559
16th to endDay
42%8%14%23%10%
2700
July1st to 15thDay
38%7%13%23%15%1
2505
16th to endDay
41%8%14%22%10%1
2312
August1st to 15thDay
43%7%16%19%11%1
2327
16th to endDay
43%8%14%22%9%1
2452
September1st to 15thDay
45%7%14%22%9%
2050
16th to endDay
42%7%13%26%9%
1815
October1st to 15thDay
54%6%10%15%12%1
1658
16th to endDay
64%5%14%11%4
1749
November1st to 15thDay
53%7%15%15%7%
1507
16th to endDay
67%5%11%11%3
1440
December1st to 15thDay
76%7%8%6%1
1440
16th to endDay
78%5%7%6%1
1536
January1st to 15thNight
68%6%10%9%4
2413
16th to endNight
69%5%11%9%3
2496
February1st to 15thNight
66%6%11%12%3
2287
16th to endNight
60%5%14%11%7%
1978
March1st to 15thNight
57%5%11%18%6%
2002
16th to endNight
47%5%10%21%13%2
2112
April1st to 15thNight
51%410%19%12%
1829
16th to endNight
44%49%19%18%3
1620
May1st to 15thNight
45%5%10%23%13%2
1620
16th to endNight
36%6%14%26%13%3
1508
June1st to 15thNight
38%6%12%26%15%1
1398
16th to endNight
35%7%14%25%16%1
1260
July1st to 15thNight
24%7%12%30%22%2
1223
16th to endNight
32%7%15%23%17%2
1591
August1st to 15thNight
30%8%17%28%13%1
1609
16th to endNight
33%6%11%30%16%1
1737
September1st to 15thNight
37%6%12%28%14%1
1828
16th to endNight
36%6%15%27%14%
1815
October1st to 15thNight
46%6%12%21%13%
1972
16th to endNight
56%7%14%15%6%
2120
November1st to 15thNight
49%6%13%18%10%1
2349
16th to endNight
62%6%12%12%4
2520
December1st to 15thNight
71%7%11%7%2
2520
16th to endNight
75%6%8%6%1
2688

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 15thDay
21%17%44%12%5%
75
16th to endDay
31%14%37%16%
96
February1st to 15thDay
28%22%37%11%
90
16th to endDay
22%19%43%12%2
81
March1st to 15thDay
25%11%34%20%7%
246
16th to endDay
21%7%33%24%9%3
288
April1st to 15thDay
24%12%30%18%13%1
270
16th to endDay
25%9%29%19%11%5%
270
May1st to 15thDay
23%7%27%21%13%5%
288
16th to endDay
18%5%29%25%13%7%
331
June1st to 15thDay
18%8%20%30%18%2
354
16th to endDay
14%7%29%30%14%3
495
July1st to 15thDay
12%425%28%21%8%
439
16th to endDay
12%222%30%21%11%
326
August1st to 15thDay
13%117%29%22%15%
313
16th to endDay
16%5%16%23%18%18%
332
September1st to 15thDay
13%416%25%27%13%
299
16th to endDay
19%416%23%20%14%
254
October1st to 15thDay
20%7%25%26%14%5%
255
16th to endDay
32%11%27%22%4
261
November1st to 15thDay
12%14%33%20%14%3
77
16th to endDay
28%16%38%6%6%3
60
December1st to 15thDay
28%26%28%13%3
60
16th to endDay
35%20%35%7%
64
January1st to 15thNight
26%17%35%15%4
720
16th to endNight
21%12%38%23%4
768
February1st to 15thNight
20%15%37%21%3
704
16th to endNight
22%12%34%24%5%
631
March1st to 15thNight
20%15%35%21%6%
720
16th to endNight
19%10%33%25%11%
768
April1st to 15thNight
24%11%32%24%6%
694
16th to endNight
16%9%29%32%9%1
540
May1st to 15thNight
18%5%28%30%14%1
540
16th to endNight
13%231%35%16%
386
June1st to 15thNight
14%326%40%14%
360
16th to endNight
13%127%42%14%
360
July1st to 15thNight
4221%48%22%1
340
16th to endNight
8%121%45%20%1
560
August1st to 15thNight
8%17%42%28%2
539
16th to endNight
12%220%33%27%4
591
September1st to 15thNight
14%5%20%32%21%5%
707
16th to endNight
15%419%31%22%5%
657
October1st to 15thNight
21%6%23%30%14%2
660
16th to endNight
26%11%31%24%5%
704
November1st to 15thNight
19%9%32%25%11%1
700
16th to endNight
26%14%29%22%6%1
720
December1st to 15thNight
27%16%34%17%3
720
16th to endNight
26%18%33%16%4
768
Page generated at 2017-09-13 07:39:24. Version ac04

Copyright 2017 A. Danko


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