Cricket Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cricket Hill clear sky chart from 2005-11-05 to 2017-09-18.

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
41%
15972
15%
46852
11%
15931
45%
15931
22%
32122

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
20%
900
10%
2506
3%
895
27%
895
16%
1892
January16th to endNight
22%
960
9%
2676
4%
960
26%
960
14%
2055
February1st to 15thNight
23%
779
12%
2190
4%
779
30%
779
19%
1579
February16th to endNight
29%
631
16%
1893
8%
631
37%
631
18%
1364
March1st to 15thNight
32%
720
12%
2160
8%
720
35%
720
18%
1546
March16th to endNight
37%
645
14%
2020
10%
645
42%
645
19%
1430
April1st to 15thNight
38%
539
14%
1797
12%
539
44%
539
19%
1234
April16th to endNight
43%
540
18%
1718
14%
540
50%
540
22%
1147
May1st to 15thNight
46%
540
15%
1616
11%
540
49%
540
21%
1148
May16th to endNight
58%
561
16%
1498
12%
561
60%
561
32%
972
June1st to 15thNight
62%
540
16%
1440
12%
540
64%
540
35%
902
June16th to endNight
62%
540
15%
1440
11%
540
64%
540
32%
925
July1st to 15thNight
72%
510
16%
1360
12%
510
73%
510
38%
832
July16th to endNight
72%
564
20%
1417
17%
531
74%
531
40%
845
August1st to 15thNight
76%
539
21%
1566
21%
536
77%
536
40%
892
August16th to endNight
68%
573
20%
1910
21%
573
72%
573
33%
1084
September1st to 15thNight
63%
557
25%
1817
25%
557
65%
557
33%
1036
September16th to endNight
59%
669
25%
1848
20%
669
63%
669
33%
1147
October1st to 15thNight
50%
660
23%
1881
18%
660
55%
660
30%
1194
October16th to endNight
30%
704
15%
2254
9%
704
38%
704
19%
1530
November1st to 15thNight
34%
700
20%
2276
16%
700
42%
700
23%
1460
November16th to endNight
27%
741
14%
2361
9%
741
33%
741
16%
1667
December1st to 15thNight
18%
900
8%
2520
3%
900
22%
900
12%
2006
December16th to endNight
15%
960
9%
2688
2%
960
21%
960
10%
2235

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
13%7%36%5%35%5%5%7%37%
47955
Night
15%8%35%5%3445%7%37%
47020
Cloud CoverDay
13%7%36%5%35%5%5%7%37%
47964
Night
15%8%35%5%3445%7%37%
47025
TransparencyDay
44%8%13%20%11%1
47641
Night
45%6%13%20%12%1
46852
SeeingDay
14%321%34%20%5%
5975
Night
18%6%26%30%15%2
15977

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
15%11%5%8%6%35%7%6%8%21%
1432
16th to endDay
11%16%6%9%7%35%5%47%20%
1548
February1st to 15thDay
13%13%6%7%7%345%5%6%26%
1671
16th to endDay
13%10%48%6%45%5%47%29%
1580
March1st to 15thDay
15%10%38%5%35%45%6%31%
1790
16th to endDay
17%8%46%5%24446%33%
2215
April1st to 15thDay
18%8%36%5%34446%33%
2151
16th to endDay
17%6%35%6%35%45%7%36%
2241
May1st to 15thDay
16%8%36%5%345%5%7%32%
2333
16th to endDay
12%435%6%35%5%5%7%40%
2617
June1st to 15thDay
10%425%4345%6%7%44%
2520
16th to endDay
9%425%5%35%6%6%9%40%
2520
July1st to 15thDay
5%4245%245%5%9%49%
2520
16th to endDay
6%324445%5%6%10%46%
2655
August1st to 15thDay
6%4245%25%5%7%8%47%
2383
16th to endDay
8%325%4345%6%9%46%
2292
September1st to 15thDay
12%41442435%7%48%
2130
16th to endDay
9%6%246%25%6%6%8%41%
1837
October1st to 15thDay
14%7%245%34446%42%
1749
16th to endDay
17%8%26%435%45%6%35%
1617
November1st to 15thDay
13%7%25%5%3435%7%39%
1582
16th to endDay
17%8%47%5%35%5%46%32%
1596
December1st to 15thDay
18%11%6%8%8%35%45%5%21%
1440
16th to endDay
21%15%5%8%5%345%45%20%
1536
January1st to 15thNight
17%11%46%6%3445%5%29%
2506
16th to endNight
14%13%6%8%5%3446%7%24%
2676
February1st to 15thNight
16%10%5%6%42435%6%34%
2188
16th to endNight
17%10%46%5%35%345%33%
1893
March1st to 15thNight
16%10%47%5%34345%34%
2147
16th to endNight
16%8%36%425%5%5%7%33%
2020
April1st to 15thNight
18%7%35%5%35%447%34%
1797
16th to endNight
20%7%2432435%5%40%
1718
May1st to 15thNight
18%7%36%4245%5%7%33%
1616
16th to endNight
11%4245%335%5%9%43%
1496
June1st to 15thNight
10%6%235%2445%7%46%
1440
16th to endNight
8%4345%345%8%10%40%
1440
July1st to 15thNight
6%213435%45%8%52%
1440
16th to endNight
6%3134245%7%9%50%
1513
August1st to 15thNight
5%3134245%6%9%53%
1575
16th to endNight
9%5%1342345%7%52%
1910
September1st to 15thNight
11%413424447%51%
1817
16th to endNight
10%5%15%324348%49%
1848
October1st to 15thNight
14%5%25%323447%45%
1881
16th to endNight
20%6%25%5%23347%37%
2254
November1st to 15thNight
14%7%25%424445%43%
2276
16th to endNight
17%8%36%5%25%446%33%
2361
December1st to 15thNight
21%11%47%6%4445%6%23%
2520
16th to endNight
24%15%48%6%35%435%19%
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
15%11%48%7%35%8%5%8%20%
1432
16th to endDay
11%15%7%9%7%36%5%47%19%
1548
February1st to 15thDay
13%14%5%6%8%26%45%5%26%
1671
16th to endDay
13%9%48%6%45%5%46%29%
1580
March1st to 15thDay
14%10%48%5%35%5%5%6%31%
1800
16th to endDay
17%8%46%5%34446%34%
2214
April1st to 15thDay
18%8%35%5%35%446%33%
2151
16th to endDay
17%6%25%5%35%45%8%36%
2241
May1st to 15thDay
16%7%36%5%35%45%8%32%
2333
16th to endDay
12%426%6%25%5%5%7%41%
2617
June1st to 15thDay
10%5%14435%5%6%8%44%
2520
16th to endDay
8%425%5%35%6%6%9%41%
2520
July1st to 15thDay
6%325%425%5%5%9%50%
2520
16th to endDay
6%3145%45%5%7%9%47%
2655
August1st to 15thDay
6%3245%345%7%8%48%
2383
16th to endDay
8%325%425%45%9%46%
2292
September1st to 15thDay
12%41442435%7%48%
2130
16th to endDay
10%5%245%35%6%6%8%41%
1837
October1st to 15thDay
14%6%345%345%45%42%
1749
16th to endDay
17%8%26%5%345%46%35%
1617
November1st to 15thDay
13%7%36%5%34347%39%
1582
16th to endDay
17%8%47%5%36%435%32%
1596
December1st to 15thDay
19%11%5%9%8%45%5%45%20%
1440
16th to endDay
21%16%48%5%35%44420%
1536
January1st to 15thNight
17%11%46%6%3445%5%28%
2506
16th to endNight
14%13%7%7%6%245%6%6%23%
2676
February1st to 15thNight
15%10%5%6%43445%6%33%
2181
16th to endNight
17%11%46%5%35%34433%
1893
March1st to 15thNight
17%10%47%5%34335%34%
2160
16th to endNight
16%9%35%5%25%45%7%33%
2020
April1st to 15thNight
18%7%35%5%35%437%35%
1797
16th to endNight
20%7%2442335%440%
1718
May1st to 15thNight
18%7%36%5%25%45%7%33%
1615
16th to endNight
11%4245%345%5%9%43%
1496
June1st to 15thNight
10%6%144345%48%46%
1440
16th to endNight
8%425%5%35%5%8%10%40%
1440
July1st to 15thNight
6%223435%5%48%52%
1440
16th to endNight
6%3144245%7%9%49%
1513
August1st to 15thNight
5%31442445%9%53%
1575
16th to endNight
9%42342345%7%52%
1910
September1st to 15thNight
11%42332445%6%50%
1817
16th to endNight
11%425%434348%48%
1848
October1st to 15thNight
14%5%25%423347%45%
1881
16th to endNight
21%6%25%5%33347%37%
2254
November1st to 15thNight
14%7%25%434436%42%
2276
16th to endNight
18%8%37%445%346%33%
2361
December1st to 15thNight
21%11%47%6%45%5%45%22%
2520
16th to endNight
24%14%5%8%6%4443418%
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
58%9%14%11%5%
1433
16th to endDay
60%7%14%12%4
1548
February1st to 15thDay
58%7%11%15%6%1
1673
16th to endDay
53%9%12%18%5%1
1580
March1st to 15thDay
52%6%14%17%6%1
1800
16th to endDay
50%8%14%21%4
2215
April1st to 15thDay
50%5%10%20%11%
2151
16th to endDay
45%7%14%16%11%3
2241
May1st to 15thDay
49%7%13%22%6%
2333
16th to endDay
40%8%13%21%14%1
2621
June1st to 15thDay
36%8%11%23%19%1
2520
16th to endDay
36%9%15%19%16%2
2520
July1st to 15thDay
31%8%13%27%16%2
2371
16th to endDay
29%10%17%23%15%3
2488
August1st to 15thDay
31%8%15%26%15%1
2368
16th to endDay
31%8%16%23%16%2
2292
September1st to 15thDay
34%6%13%23%19%2
2130
16th to endDay
37%7%12%26%14%1
1837
October1st to 15thDay
42%6%11%23%14%1
1749
16th to endDay
49%5%13%21%8%1
1617
November1st to 15thDay
43%5%13%21%13%2
1582
16th to endDay
52%7%14%19%5%
1596
December1st to 15thDay
61%9%13%12%3
1440
16th to endDay
64%8%11%10%4
1536
January1st to 15thNight
54%6%15%16%5%
2506
16th to endNight
56%7%17%13%4
2676
February1st to 15thNight
51%5%14%18%9%
2190
16th to endNight
53%5%12%21%6%1
1893
March1st to 15thNight
52%5%12%17%10%1
2160
16th to endNight
49%7%14%20%7%1
2020
April1st to 15thNight
48%5%9%20%14%
1797
16th to endNight
45%5%10%20%13%4
1718
May1st to 15thNight
49%6%10%22%11%
1616
16th to endNight
36%6%14%21%17%2
1498
June1st to 15thNight
34%5%13%25%18%2
1440
16th to endNight
34%9%16%21%17%1
1440
July1st to 15thNight
29%8%14%25%18%3
1360
16th to endNight
26%8%17%24%18%3
1417
August1st to 15thNight
26%7%15%28%20%2
1566
16th to endNight
30%7%12%27%17%4
1910
September1st to 15thNight
32%5%12%23%23%2
1817
16th to endNight
34%6%9%29%18%2
1848
October1st to 15thNight
38%5%10%26%18%1
1881
16th to endNight
47%5%13%22%9%1
2254
November1st to 15thNight
42%5%11%22%14%3
2276
16th to endNight
50%6%16%20%6%
2361
December1st to 15thNight
58%10%11%13%5%
2520
16th to endNight
68%5%9%12%3
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
27%437%25%4
90
16th to endDay
16%6%34%36%5%1
96
February1st to 15thDay
14%13%51%20%1
90
16th to endDay
9%7%33%32%16%1
81
March1st to 15thDay
27%7%31%28%4
90
16th to endDay
28%5%26%27%11%1
256
April1st to 15thDay
23%7%27%30%9%1
270
16th to endDay
22%425%27%13%6%
270
May1st to 15thDay
21%228%32%12%2
290
16th to endDay
16%121%34%23%2
517
June1st to 15thDay
12%117%40%23%4
495
16th to endDay
10%223%41%17%4
495
July1st to 15thDay
7%17%40%25%8%
475
16th to endDay
6%111%44%29%7%
515
August1st to 15thDay
7%110%38%31%11%
385
16th to endDay
10%211%33%31%11%
332
September1st to 15thDay
11%212%30%31%10%
315
16th to endDay
12%216%29%31%7%
262
October1st to 15thDay
17%323%27%22%4
189
16th to endDay
26%5%28%37%3
96
November1st to 15thDay
211%18%33%32%2
90
16th to endDay
27%15%31%20%5%
90
December1st to 15thDay
16%13%36%28%31
90
16th to endDay
27%13%50%7%2
96
January1st to 15thNight
22%12%39%20%5%
900
16th to endNight
20%11%36%28%4
960
February1st to 15thNight
21%7%38%26%6%
782
16th to endNight
21%8%33%29%6%
631
March1st to 15thNight
22%6%32%28%10%
720
16th to endNight
19%431%30%12%1
645
April1st to 15thNight
21%7%28%31%10%
539
16th to endNight
23%422%32%14%2
540
May1st to 15thNight
21%220%37%16%1
540
16th to endNight
13%17%37%28%2
563
June1st to 15thNight
13%113%42%26%2
540
16th to endNight
10%117%39%28%2
540
July1st to 15thNight
9%19%40%35%4
510
16th to endNight
7%111%40%32%6%
564
August1st to 15thNight
7%8%42%32%9%
539
16th to endNight
10%112%31%34%8%
573
September1st to 15thNight
13%214%32%29%7%
557
16th to endNight
13%414%30%28%7%
669
October1st to 15thNight
17%7%17%33%20%3
660
16th to endNight
25%9%30%23%9%
704
November1st to 15thNight
18%9%34%23%13%1
700
16th to endNight
21%15%30%24%7%
741
December1st to 15thNight
26%12%35%19%4
900
16th to endNight
30%11%34%20%1
960
Page generated at 2017-09-19 06:32:31. Version ac04

Copyright 2017 A. Danko


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