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 2018-03-11.

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
33%
15572
13%
48804
9%
15534
39%
15534
17%
35046

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
14%
776
8%
2615
3%
776
20%
776
7%
2129
January16th to endNight
16%
832
8%
2704
3%
832
21%
832
7%
2222
February1st to 15thNight
16%
763
6%
2482
2%
761
21%
761
9%
2016
February16th to endNight
20%
683
9%
2141
4%
683
27%
683
12%
1643
March1st to 15thNight
23%
764
13%
2125
6%
764
28%
764
16%
1618
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%
720
20%
1864
12%
720
58%
720
33%
1211
September16th to endNight
56%
717
21%
1980
16%
717
58%
717
32%
1227
October1st to 15thNight
42%
720
16%
2151
13%
720
46%
720
22%
1470
October16th to endNight
25%
768
13%
2313
8%
768
32%
768
15%
1753
November1st to 15thNight
33%
760
15%
2550
13%
760
38%
760
16%
1798
November16th to endNight
22%
780
9%
2730
6%
780
27%
780
10%
2113
December1st to 15thNight
14%
780
4%
2730
1%
780
18%
780
6%
2310
December16th to endNight
10%
832
5%
2912
1%
832
15%
832
4%
2532

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%
49817
Night
14%9%47%6%3445%6%31%
48979
Cloud CoverDay
15%9%47%6%35%45%7%29%
49827
Night
14%9%47%6%35%45%7%32%
48983
TransparencyDay
53%6%12%17%9%
49510
Night
52%6%12%18%9%1
48804
SeeingDay
19%8%26%23%14%6%
6164
Night
19%10%29%27%11%1
15578

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%15%7%12%9%3444415%
1650
16th to endDay
12%17%10%13%8%45%435%12%
1872
February1st to 15thDay
16%16%8%12%9%5%5%43413%
1710
16th to endDay
16%14%7%10%8%45%445%18%
1617
March1st to 15thDay
14%14%5%10%7%35%43425%
2059
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
13%6%36%435%6%6%8%34%
2094
16th to endDay
15%6%245%245%5%7%39%
1980
October1st to 15thDay
20%9%37%5%345%35%31%
1809
16th to endDay
25%11%46%6%36%45%422%
1908
November1st to 15thDay
15%13%47%5%25%45%6%29%
1636
16th to endDay
17%15%7%9%7%3445%6%17%
1560
December1st to 15thDay
16%18%9%13%8%4443412%
1560
16th to endDay
18%18%10%12%9%344439%
1664
January1st to 15thNight
20%14%6%8%8%45%45%5%15%
2615
16th to endNight
13%14%9%12%8%45%45%5%14%
2704
February1st to 15thNight
14%13%8%10%8%46%5%45%18%
2480
16th to endNight
16%11%49%8%45%45%7%21%
2141
March1st to 15thNight
16%9%48%7%3445%7%28%
2113
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%43435%7%46%
1864
16th to endNight
11%5%2442445%8%45%
1980
October1st to 15thNight
17%6%36%5%33346%37%
2151
16th to endNight
22%8%36%7%2445%7%26%
2313
November1st to 15thNight
16%9%46%5%35%45%7%31%
2550
16th to endNight
18%12%6%8%6%34447%21%
2730
December1st to 15thNight
17%17%7%11%7%35%5%5%414%
2730
16th to endNight
19%16%8%13%8%34445%10%
2912

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%16%6%11%8%44445%16%
1650
16th to endDay
13%16%8%13%8%5%5%44413%
1872
February1st to 15thDay
16%15%8%11%9%45%44414%
1710
16th to endDay
16%15%6%11%7%45%345%19%
1617
March1st to 15thDay
15%13%6%10%7%25%34425%
2070
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
14%6%25%6%35%46%9%34%
2094
16th to endDay
15%5%25%445%45%8%39%
1980
October1st to 15thDay
20%9%37%6%3435%5%31%
1809
16th to endDay
24%10%48%6%34446%21%
1908
November1st to 15thDay
14%11%47%6%35%45%7%29%
1636
16th to endDay
17%15%7%8%7%345%5%6%19%
1560
December1st to 15thDay
16%16%8%12%9%36%5%3313%
1560
16th to endDay
19%16%9%13%9%5%433410%
1664
January1st to 15thNight
20%14%5%8%7%45%446%16%
2615
16th to endNight
14%13%8%11%8%46%5%45%16%
2704
February1st to 15thNight
14%12%7%10%8%46%45%5%19%
2473
16th to endNight
16%12%5%9%8%35%45%6%22%
2141
March1st to 15thNight
17%9%47%7%35%446%28%
2125
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%425%435%45%6%47%
1864
16th to endNight
12%4144335%5%8%46%
1980
October1st to 15thNight
17%6%27%5%23446%38%
2151
16th to endNight
20%8%37%5%4445%6%28%
2313
November1st to 15thNight
16%8%37%5%25%45%8%32%
2550
16th to endNight
18%11%5%8%7%3445%7%23%
2730
December1st to 15thNight
18%16%7%10%7%46%45%5%15%
2730
16th to endNight
19%14%7%13%8%45%44411%
2912

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
71%5%9%8%4
1651
16th to endDay
73%5%9%7%3
1872
February1st to 15thDay
72%6%7%10%2
1712
16th to endDay
66%411%11%5%
1617
March1st to 15thDay
61%5%11%12%7%
2070
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
44%7%14%22%10%1
2094
16th to endDay
41%6%13%27%10%
1980
October1st to 15thDay
54%6%10%15%11%1
1809
16th to endDay
63%5%13%11%4
1908
November1st to 15thDay
54%7%15%16%6%
1636
16th to endDay
66%5%12%11%4
1560
December1st to 15thDay
75%7%7%7%1
1560
16th to endDay
78%5%7%6%1
1664
January1st to 15thNight
67%6%10%9%4
2615
16th to endNight
68%6%11%9%3
2704
February1st to 15thNight
66%6%10%12%3
2482
16th to endNight
60%5%13%12%7%
2141
March1st to 15thNight
56%5%10%18%7%1
2125
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
36%6%11%28%14%1
1864
16th to endNight
35%6%14%28%14%
1980
October1st to 15thNight
46%5%12%21%13%
2151
16th to endNight
55%7%13%16%6%
2313
November1st to 15thNight
51%6%13%17%9%1
2550
16th to endNight
61%7%14%12%4
2730
December1st to 15thNight
71%7%11%7%2
2730
16th to endNight
75%6%8%7%2
2912

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%18%38%18%3
113
16th to endDay
29%15%38%14%1
144
February1st to 15thDay
31%20%36%11%
135
16th to endDay
27%20%40%9%1
120
March1st to 15thDay
25%11%33%20%7%
286
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%415%24%28%14%
315
16th to endDay
17%416%21%22%17%
314
October1st to 15thDay
21%7%25%24%13%6%
315
16th to endDay
29%12%29%23%5%
324
November1st to 15thDay
20%13%31%20%11%2
116
16th to endDay
25%17%41%7%5%2
90
December1st to 15thDay
25%24%31%14%4
90
16th to endDay
32%18%34%14%
96
January1st to 15thNight
26%16%35%15%4
780
16th to endNight
20%12%39%22%4
832
February1st to 15thNight
20%16%37%21%3
764
16th to endNight
22%12%35%23%5%
683
March1st to 15thNight
19%15%35%22%6%
764
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
13%5%20%31%22%5%
720
16th to endNight
14%418%30%23%7%
717
October1st to 15thNight
21%6%23%30%14%3
720
16th to endNight
25%12%31%24%6%
768
November1st to 15thNight
20%9%30%26%11%1
760
16th to endNight
25%15%29%21%6%1
780
December1st to 15thNight
26%17%34%17%3
780
16th to endNight
26%18%34%16%3
832
Page generated at 2018-03-12 13:28:12. Version ac04

Copyright 2018 A. Danko


Hackbart Road Hill Clear Sky Chart |Charts Home