King Gardens
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the King Gardens 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
34%
16204
13%
46727
7%
16157
39%
16157
21%
32969

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
27%
900
8%
2685
5%
895
31%
895
15%
2040
January16th to endNight
22%
960
12%
2604
4%
960
29%
960
15%
2022
February1st to 15thNight
31%
879
14%
2285
4%
875
37%
875
21%
1634
February16th to endNight
28%
789
13%
2051
4%
789
34%
789
19%
1540
March1st to 15thNight
30%
570
13%
2010
9%
570
36%
570
16%
1386
March16th to endNight
30%
576
14%
2112
10%
576
39%
576
16%
1461
April1st to 15thNight
30%
539
14%
1783
12%
539
36%
539
19%
1223
April16th to endNight
31%
540
14%
1620
10%
540
38%
540
18%
1167
May1st to 15thNight
33%
540
13%
1482
6%
540
37%
540
23%
1043
May16th to endNight
39%
563
12%
1498
4%
561
43%
561
27%
1021
June1st to 15thNight
43%
540
10%
1271
4%
540
45%
540
35%
849
June16th to endNight
51%
540
10%
1260
5%
540
53%
540
35%
838
July1st to 15thNight
57%
510
13%
1190
7%
510
59%
510
42%
764
July16th to endNight
59%
564
17%
1356
7%
531
61%
531
44%
803
August1st to 15thNight
64%
539
19%
1605
13%
536
68%
536
38%
908
August16th to endNight
52%
573
21%
1746
18%
573
59%
573
36%
1003
September1st to 15thNight
56%
540
18%
1800
17%
540
62%
540
33%
1020
September16th to endNight
41%
523
18%
1858
14%
523
50%
523
26%
1105
October1st to 15thNight
34%
660
18%
1980
11%
660
39%
660
24%
1309
October16th to endNight
27%
724
12%
2148
5%
724
32%
724
16%
1584
November1st to 15thNight
27%
875
16%
2451
7%
875
34%
875
20%
1763
November16th to endNight
24%
900
12%
2520
7%
900
28%
900
13%
2014
December1st to 15thNight
21%
900
6%
2532
2%
900
25%
900
11%
2066
December16th to endNight
17%
960
8%
2880
2%
960
24%
960
9%
2406

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%9%36%6%3445%7%34%
48078
Night
12%9%47%6%3445%6%34%
46886
Cloud CoverDay
13%9%36%6%35%45%7%34%
48089
Night
12%9%47%6%35%45%6%34%
46890
Cloud CoverDay
14%9%36%5%35%45%7%34%
48087
Night
12%9%47%6%3445%6%35%
46890
TransparencyDay
48%6%13%21%8%
47752
Night
48%5%13%21%8%
46730
SeeingDay
17%8%28%26%14%3
6201
Night
16%8%32%30%11%1
16205

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
10%11%410%7%46%6%6%8%21%
1253
16th to endDay
10%12%7%12%9%46%6%5%7%17%
1616
February1st to 15thDay
7%12%5%8%7%47%5%5%7%29%
1575
16th to endDay
11%11%5%9%8%46%5%5%7%24%
1422
March1st to 15thDay
14%9%47%7%45%447%30%
1948
16th to endDay
16%11%36%6%35%45%6%31%
2112
April1st to 15thDay
14%7%47%5%34446%35%
2162
16th to endDay
20%11%36%5%23446%30%
2340
May1st to 15thDay
20%10%47%424445%31%
2467
16th to endDay
15%6%245%345%6%8%34%
2617
June1st to 15thDay
15%6%35%435%5%6%8%34%
2687
16th to endDay
11%425%6%35%6%7%9%37%
2700
July1st to 15thDay
8%4244345%6%8%47%
2700
16th to endDay
6%4244345%6%9%47%
2718
August1st to 15thDay
9%6%244345%5%9%44%
2343
16th to endDay
12%5%24424447%46%
2456
September1st to 15thDay
12%6%2442335%9%44%
2160
16th to endDay
16%7%25%42335%7%41%
1814
October1st to 15thDay
18%10%35%423345%37%
1650
16th to endDay
23%13%45%6%3334427%
1722
November1st to 15thDay
12%14%47%5%33436%31%
1407
16th to endDay
14%13%7%12%8%46%427%17%
1440
December1st to 15thDay
12%13%6%11%10%6%6%5%4417%
1425
16th to endDay
12%17%9%12%10%3434416%
1344
January1st to 15thNight
8%10%6%10%9%46%5%6%7%23%
2685
16th to endNight
10%12%5%11%7%35%5%6%8%21%
2604
February1st to 15thNight
6%10%5%7%6%37%46%7%33%
2285
16th to endNight
8%10%48%8%45%7%6%7%28%
2051
March1st to 15thNight
11%8%5%8%5%25%46%5%34%
1998
16th to endNight
15%10%47%5%44445%34%
2112
April1st to 15thNight
16%8%36%6%3434438%
1783
16th to endNight
20%9%47%5%14345%32%
1620
May1st to 15thNight
18%9%35%424346%37%
1482
16th to endNight
11%6%25%5%25%45%8%39%
1496
June1st to 15thNight
11%5%343245%5%7%45%
1271
16th to endNight
8%5%23335%5%5%10%45%
1260
July1st to 15thNight
6%312326%46%8%53%
1260
16th to endNight
42143244411%54%
1450
August1st to 15thNight
7%31342445%7%54%
1614
16th to endNight
8%413433447%54%
1746
September1st to 15thNight
8%425%42345%7%51%
1800
16th to endNight
12%5%34423346%48%
1858
October1st to 15thNight
15%7%25%424446%41%
1980
16th to endNight
20%12%36%42445%6%30%
2148
November1st to 15thNight
14%12%5%7%5%23346%33%
2451
16th to endNight
14%11%6%10%9%45%445%23%
2520
December1st to 15thNight
11%14%6%11%9%5%7%5%5%7%16%
2532
16th to endNight
15%16%6%13%9%43445%17%
2880

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 15thDay
10%12%5%9%7%45%6%7%8%21%
1253
16th to endDay
9%12%6%13%8%5%6%6%5%6%17%
1616
February1st to 15thDay
7%12%49%6%37%5%47%28%
1575
16th to endDay
11%11%5%9%9%45%5%46%25%
1422
March1st to 15thDay
14%9%47%6%5%4447%30%
1959
16th to endDay
16%10%36%6%3445%6%31%
2112
April1st to 15thDay
15%8%37%5%34446%35%
2162
16th to endDay
21%11%37%424446%30%
2340
May1st to 15thDay
20%10%47%433345%31%
2467
16th to endDay
15%6%25%5%45%5%6%8%34%
2617
June1st to 15thDay
15%6%35%5%35%6%5%8%34%
2687
16th to endDay
11%425%6%36%6%6%9%37%
2700
July1st to 15thDay
8%5%245%2446%8%47%
2700
16th to endDay
6%4145%345%6%10%47%
2718
August1st to 15thDay
10%5%245%245%5%8%43%
2343
16th to endDay
13%425%3245%47%46%
2456
September1st to 15thDay
12%6%2442345%8%44%
2160
16th to endDay
16%7%3441345%6%41%
1814
October1st to 15thDay
18%11%25%5%23335%37%
1650
16th to endDay
23%13%46%5%2433427%
1722
November1st to 15thDay
12%15%5%7%5%24435%31%
1407
16th to endDay
13%14%7%12%8%47%326%18%
1440
December1st to 15thDay
12%13%7%11%10%5%7%44417%
1425
16th to endDay
12%17%9%11%11%4433416%
1344
January1st to 15thNight
8%10%6%11%8%46%5%6%7%23%
2685
16th to endNight
10%12%5%11%7%45%6%6%7%21%
2604
February1st to 15thNight
6%11%48%6%36%5%6%7%33%
2278
16th to endNight
8%9%49%8%35%7%6%7%27%
2051
March1st to 15thNight
11%9%5%8%5%245%6%6%34%
2010
16th to endNight
15%9%47%6%35%445%33%
2112
April1st to 15thNight
16%8%36%6%3433438%
1783
16th to endNight
20%10%47%424345%32%
1620
May1st to 15thNight
18%8%35%42435%5%38%
1481
16th to endNight
11%7%26%5%25%5%5%7%40%
1496
June1st to 15thNight
11%5%25%42445%7%46%
1271
16th to endNight
8%5%23335%5%5%9%46%
1260
July1st to 15thNight
6%323326%45%7%53%
1260
16th to endNight
42144245%5%11%54%
1450
August1st to 15thNight
7%32342446%7%53%
1614
16th to endNight
9%323424437%54%
1746
September1st to 15thNight
8%5%24423447%52%
1800
16th to endNight
12%5%35%323446%48%
1858
October1st to 15thNight
15%8%35%4235%46%41%
1980
16th to endNight
20%12%46%424345%30%
2148
November1st to 15thNight
14%11%5%7%5%23445%34%
2451
16th to endNight
14%11%5%11%9%45%445%23%
2520
December1st to 15thNight
11%13%7%10%9%5%7%5%5%6%16%
2532
16th to endNight
15%16%7%13%8%44345%16%
2880

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
10%12%6%9%8%45%6%6%8%21%
1253
16th to endDay
9%12%7%13%8%46%6%5%7%17%
1616
February1st to 15thDay
7%12%5%9%6%37%5%47%29%
1575
16th to endDay
12%10%5%9%8%5%5%45%7%25%
1422
March1st to 15thDay
14%9%47%7%45%35%6%30%
1959
16th to endDay
17%10%46%5%3445%7%31%
2110
April1st to 15thDay
14%7%37%5%34446%36%
2162
16th to endDay
20%11%36%5%23446%30%
2340
May1st to 15thDay
20%10%37%424445%31%
2467
16th to endDay
16%5%246%35%5%6%8%35%
2617
June1st to 15thDay
15%6%25%5%35%6%6%8%34%
2687
16th to endDay
12%425%6%36%5%6%9%37%
2700
July1st to 15thDay
8%4244245%5%8%48%
2700
16th to endDay
6%4145%35%5%6%9%47%
2718
August1st to 15thDay
10%5%244345%5%8%44%
2343
16th to endDay
13%5%24324447%47%
2456
September1st to 15thDay
12%7%25%32345%8%44%
2160
16th to endDay
17%7%345%13447%41%
1814
October1st to 15thDay
18%12%25%423345%36%
1650
16th to endDay
23%14%45%5%24235%27%
1722
November1st to 15thDay
13%15%5%7%5%34435%31%
1407
16th to endDay
14%13%6%11%8%47%335%18%
1440
December1st to 15thDay
12%13%7%10%10%6%5%5%4417%
1425
16th to endDay
13%17%9%10%10%4433416%
1344
January1st to 15thNight
8%10%6%11%8%46%6%6%7%23%
2685
16th to endNight
10%12%5%10%8%45%5%7%7%22%
2604
February1st to 15thNight
6%10%5%8%5%36%6%5%7%33%
2278
16th to endNight
9%9%49%8%46%7%6%7%27%
2051
March1st to 15thNight
11%9%5%8%5%35%5%5%5%34%
2010
16th to endNight
15%9%46%6%35%445%33%
2112
April1st to 15thNight
16%8%36%6%3434438%
1783
16th to endNight
20%9%46%5%24445%32%
1620
May1st to 15thNight
18%8%35%414346%37%
1481
16th to endNight
11%6%25%5%35%5%5%8%40%
1496
June1st to 15thNight
12%435%324446%47%
1271
16th to endNight
9%5%233245%6%9%46%
1260
July1st to 15thNight
6%313435%46%7%53%
1260
16th to endNight
5%2144145%5%10%55%
1450
August1st to 15thNight
7%32332446%7%54%
1614
16th to endNight
8%423424437%54%
1746
September1st to 15thNight
8%5%24424347%51%
1800
16th to endNight
13%5%24423446%48%
1858
October1st to 15thNight
15%9%24424446%41%
1980
16th to endNight
20%12%36%424345%30%
2148
November1st to 15thNight
15%11%5%7%5%23345%34%
2451
16th to endNight
15%10%6%11%9%44445%23%
2520
December1st to 15thNight
11%14%7%10%9%5%7%5%5%6%16%
2532
16th to endNight
15%16%7%12%8%44345%16%
2880

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
57%6%10%18%6%
1254
16th to endDay
63%7%10%13%4
1616
February1st to 15thDay
53%5%13%18%7%
1576
16th to endDay
57%6%11%17%6%
1422
March1st to 15thDay
53%5%14%18%7%
1959
16th to endDay
53%6%12%21%4
2112
April1st to 15thDay
49%5%12%19%11%1
2162
16th to endDay
55%412%16%10%
2340
May1st to 15thDay
55%5%11%21%5%
2467
16th to endDay
45%7%14%21%10%
2621
June1st to 15thDay
45%8%17%21%6%
2687
16th to endDay
41%9%15%24%8%
2700
July1st to 15thDay
33%8%14%28%14%1
2541
16th to endDay
31%9%19%26%11%
2549
August1st to 15thDay
36%8%15%29%8%1
2328
16th to endDay
36%7%15%26%12%1
2456
September1st to 15thDay
36%7%17%30%7%
2160
16th to endDay
42%6%15%31%3
1814
October1st to 15thDay
49%414%22%7%1
1650
16th to endDay
60%412%16%6%
1722
November1st to 15thDay
54%6%12%16%9%
1407
16th to endDay
67%6%9%10%6%
1440
December1st to 15thDay
68%411%12%2
1425
16th to endDay
72%38%9%5%
1344
January1st to 15thNight
58%5%11%18%5%
2685
16th to endNight
59%5%11%16%6%
2604
February1st to 15thNight
47%6%12%23%8%
2288
16th to endNight
51%7%11%20%7%
2051
March1st to 15thNight
49%7%15%18%8%
2010
16th to endNight
51%5%14%19%7%
2112
April1st to 15thNight
50%411%21%11%1
1783
16th to endNight
53%410%17%12%
1620
May1st to 15thNight
48%5%12%23%9%
1482
16th to endNight
41%7%14%20%14%1
1498
June1st to 15thNight
37%5%19%25%10%1
1271
16th to endNight
33%8%19%25%10%2
1260
July1st to 15thNight
29%7%17%29%15%1
1190
16th to endNight
23%8%19%30%16%1
1356
August1st to 15thNight
27%7%14%35%11%3
1605
16th to endNight
30%5%15%30%15%2
1746
September1st to 15thNight
31%5%16%35%10%
1800
16th to endNight
36%5%14%34%7%
1858
October1st to 15thNight
43%5%14%25%9%
1980
16th to endNight
55%413%19%6%
2148
November1st to 15thNight
52%312%20%9%1
2451
16th to endNight
62%6%11%13%5%
2520
December1st to 15thNight
66%5%12%12%3
2532
16th to endNight
70%49%11%4
2880

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
17%11%37%23%8%1
90
16th to endDay
20%7%32%33%6%
96
February1st to 15thDay
21%18%40%17%2
90
16th to endDay
22%11%43%14%6%2
81
March1st to 15thDay
18%10%37%21%12%
90
16th to endDay
18%7%34%19%17%2
96
April1st to 15thDay
14%9%36%27%10%1
281
16th to endDay
28%8%27%22%11%1
450
May1st to 15thDay
22%13%31%20%9%2
468
16th to endDay
21%8%29%25%12%3
517
June1st to 15thDay
15%12%29%28%11%3
495
16th to endDay
13%9%31%25%15%5%
495
July1st to 15thDay
11%6%23%30%21%8%
475
16th to endDay
7%6%26%31%21%6%
515
August1st to 15thDay
11%419%31%26%5%
493
16th to endDay
15%5%24%30%18%5%
496
September1st to 15thDay
12%326%33%20%2
315
16th to endDay
22%6%34%21%14%
106
October1st to 15thDay
17%10%36%18%11%5%
90
16th to endDay
29%10%31%17%9%2
96
November1st to 15thDay
14%8%35%30%8%2
90
16th to endDay
40%14%25%17%2
90
December1st to 15thDay
15%443%28%7%
90
16th to endDay
25%11%29%23%6%4
96
January1st to 15thNight
13%10%34%28%9%2
900
16th to endNight
17%10%40%25%5%
960
February1st to 15thNight
11%10%34%30%11%1
880
16th to endNight
13%8%39%25%10%2
789
March1st to 15thNight
15%9%36%27%10%
570
16th to endNight
19%8%30%28%10%3
576
April1st to 15thNight
20%8%34%28%7%
539
16th to endNight
24%6%29%29%9%1
540
May1st to 15thNight
22%10%30%27%9%
540
16th to endNight
14%5%35%32%11%1
563
June1st to 15thNight
13%5%33%36%10%
540
16th to endNight
11%6%26%39%15%
540
July1st to 15thNight
7%327%38%22%
510
16th to endNight
6%226%41%22%1
564
August1st to 15thNight
8%218%45%22%1
539
16th to endNight
10%327%35%19%1
573
September1st to 15thNight
11%324%36%20%2
540
16th to endNight
13%6%34%29%12%2
523
October1st to 15thNight
23%8%31%26%9%
660
16th to endNight
28%9%28%29%4
724
November1st to 15thNight
20%11%34%25%7%
875
16th to endNight
20%12%34%23%8%
900
December1st to 15thNight
18%10%35%26%8%
900
16th to endNight
23%9%33%25%6%1
960
Page generated at 2017-09-19 06:32:24. Version ac04

Copyright 2017 A. Danko


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