Lloyd Manor Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lloyd Manor Park clear sky chart from 2005-11-05 to 2018-08-29.

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
38%
15993
16%
50578
11%
15957
45%
15957
21%
33738

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
18%
777
11%
2675
4%
776
26%
776
11%
2028
January16th to endNight
20%
832
14%
2704
5%
832
30%
832
14%
2003
February1st to 15thNight
19%
761
11%
2482
3%
761
28%
761
12%
1865
February16th to endNight
24%
683
14%
2178
6%
683
34%
683
16%
1547
March1st to 15thNight
26%
780
15%
2145
7%
780
33%
780
18%
1556
March16th to endNight
34%
832
22%
2288
12%
832
42%
832
26%
1531
April1st to 15thNight
29%
778
16%
1973
6%
778
35%
778
23%
1404
April16th to endNight
40%
602
21%
1758
10%
602
48%
602
28%
1119
May1st to 15thNight
48%
536
18%
1706
12%
536
55%
536
26%
1074
May16th to endNight
54%
406
18%
1625
17%
406
62%
406
27%
878
June1st to 15thNight
50%
390
15%
1560
15%
390
59%
390
24%
884
June16th to endNight
56%
390
14%
1503
18%
390
62%
390
28%
829
July1st to 15thNight
70%
370
19%
1480
28%
370
75%
370
39%
694
July16th to endNight
68%
536
17%
1664
19%
504
69%
504
35%
908
August1st to 15thNight
69%
575
19%
1715
14%
572
71%
572
38%
975
August16th to endNight
66%
668
24%
1898
16%
668
69%
668
37%
1111
September1st to 15thNight
58%
720
23%
1813
11%
720
63%
720
38%
1128
September16th to endNight
59%
717
25%
2001
18%
717
63%
717
35%
1204
October1st to 15thNight
44%
720
19%
2160
17%
720
50%
720
26%
1409
October16th to endNight
30%
768
16%
2304
10%
768
38%
768
18%
1661
November1st to 15thNight
38%
760
19%
2574
16%
760
45%
760
20%
1683
November16th to endNight
28%
780
13%
2730
8%
780
36%
780
15%
1916
December1st to 15thNight
20%
780
9%
2730
4%
780
26%
780
12%
2042
December16th to endNight
15%
832
8%
2912
2%
832
22%
832
9%
2289

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
14%7%36%6%35%5%5%7%33%
51606
Night
15%8%36%5%3445%6%36%
50759
Cloud CoverDay
14%7%36%6%35%5%5%7%34%
51616
Night
15%8%36%5%3445%6%36%
50763
TransparencyDay
47%412%22%11%1
51305
Night
47%312%23%12%1
50578
SeeingDay
17%5%24%26%17%7%
6515
Night
19%6%26%30%14%1
16000

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
17%12%410%8%25%5%5%6%21%
1591
16th to endDay
13%13%6%11%8%46%46%5%18%
1872
February1st to 15thDay
15%13%5%12%8%45%43421%
1710
16th to endDay
18%11%47%6%235%46%27%
1578
March1st to 15thDay
14%9%5%9%7%35%45%6%28%
2134
16th to endDay
15%8%47%5%25%346%35%
2288
April1st to 15thDay
19%10%47%5%3435%6%29%
2304
16th to endDay
17%7%35%5%24345%39%
2488
May1st to 15thDay
14%6%36%5%345%5%7%36%
2572
16th to endDay
11%425%5%35%5%5%8%42%
2842
June1st to 15thDay
13%5%25%5%3447%8%38%
2730
16th to endDay
12%4245%36%5%6%10%37%
2730
July1st to 15thDay
6%325%5%36%6%7%8%43%
2730
16th to endDay
9%425%5%47%6%7%10%37%
2747
August1st to 15thDay
7%5%35%7%45%7%6%8%39%
2487
16th to endDay
9%5%246%345%5%9%42%
2588
September1st to 15thDay
13%5%245%35%45%8%41%
2145
16th to endDay
12%5%35%5%35%35%8%41%
1958
October1st to 15thDay
18%7%36%5%3445%6%34%
1800
16th to endDay
23%9%46%6%346%5%6%24%
1920
November1st to 15thDay
14%9%46%6%3345%9%32%
1608
16th to endDay
17%11%5%6%5%35%5%5%8%24%
1560
December1st to 15thDay
17%14%5%9%7%445%5%5%19%
1560
16th to endDay
20%11%6%9%6%35%5%5%6%17%
1664
January1st to 15thNight
20%13%5%8%5%345%45%22%
2675
16th to endNight
14%11%6%8%7%35%5%5%6%24%
2704
February1st to 15thNight
14%13%6%8%7%35%5%45%25%
2480
16th to endNight
15%10%5%7%7%35%45%5%28%
2178
March1st to 15thNight
17%8%47%7%45%45%5%30%
2133
16th to endNight
14%9%36%5%2333443%
2288
April1st to 15thNight
18%7%35%5%45%45%6%34%
1973
16th to endNight
13%7%25%434446%44%
1758
May1st to 15thNight
15%415%6%345%5%6%40%
1706
16th to endNight
12%42342446%7%47%
1623
June1st to 15thNight
11%5%24435%45%9%42%
1560
16th to endNight
9%5%246%235%5%9%44%
1503
July1st to 15thNight
5%21333445%8%58%
1560
16th to endNight
8%31343446%8%49%
1770
August1st to 15thNight
6%3145%3447%8%49%
1726
16th to endNight
8%4144345%5%5%52%
1898
September1st to 15thNight
11%41442346%7%48%
1813
16th to endNight
11%5%15%424348%48%
2001
October1st to 15thNight
17%5%26%5%23446%39%
2160
16th to endNight
19%8%36%5%34445%31%
2304
November1st to 15thNight
17%6%36%5%35%45%7%35%
2574
16th to endNight
20%9%36%5%35%5%5%7%27%
2730
December1st to 15thNight
19%13%5%6%6%25%45%6%23%
2730
16th to endNight
20%13%5%9%7%35%5%5%5%19%
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%12%49%7%35%45%6%22%
1591
16th to endDay
13%13%6%11%7%45%5%6%5%18%
1872
February1st to 15thDay
14%13%5%11%9%445%45%21%
1710
16th to endDay
17%11%48%6%245%46%27%
1578
March1st to 15thDay
15%8%49%7%35%45%6%28%
2145
16th to endDay
15%8%47%5%35%345%35%
2287
April1st to 15thDay
19%10%46%43445%6%30%
2304
16th to endDay
17%7%26%434445%39%
2488
May1st to 15thDay
14%6%26%5%3446%7%36%
2572
16th to endDay
11%425%425%5%5%8%43%
2842
June1st to 15thDay
13%5%245%35%5%6%8%38%
2730
16th to endDay
12%425%436%6%7%9%38%
2730
July1st to 15thDay
6%3245%36%6%7%8%44%
2730
16th to endDay
9%425%5%46%6%8%9%37%
2747
August1st to 15thDay
7%5%26%7%35%6%6%9%39%
2487
16th to endDay
10%5%246%345%5%9%43%
2588
September1st to 15thDay
14%424435%5%5%8%41%
2145
16th to endDay
12%5%35%5%3445%8%42%
1958
October1st to 15thDay
18%7%26%6%3445%6%35%
1800
16th to endDay
23%9%36%6%445%5%6%24%
1920
November1st to 15thDay
14%8%36%6%3445%9%32%
1608
16th to endDay
18%12%47%5%25%5%5%8%24%
1560
December1st to 15thDay
18%13%5%9%7%4445%5%20%
1560
16th to endDay
20%11%5%9%6%36%46%6%18%
1664
January1st to 15thNight
20%13%48%6%35%445%22%
2675
16th to endNight
14%11%6%8%7%35%45%6%24%
2704
February1st to 15thNight
14%14%5%7%7%45%445%25%
2473
16th to endNight
15%9%48%6%35%45%5%29%
2178
March1st to 15thNight
18%8%37%7%45%446%30%
2145
16th to endNight
14%9%36%5%2333442%
2288
April1st to 15thNight
19%7%35%5%35%45%6%34%
1973
16th to endNight
13%6%25%4245%46%44%
1758
May1st to 15thNight
15%415%6%3445%7%40%
1705
16th to endNight
12%42442436%7%47%
1623
June1st to 15thNight
11%5%25%4345%5%9%42%
1560
16th to endNight
9%4246%245%5%8%44%
1503
July1st to 15thNight
5%213325%348%57%
1560
16th to endNight
8%32343446%8%49%
1770
August1st to 15thNight
6%3145%3447%8%49%
1726
16th to endNight
8%414435%45%5%52%
1898
September1st to 15thNight
11%41432346%7%48%
1813
16th to endNight
11%5%2442435%8%48%
2001
October1st to 15thNight
17%5%26%5%23447%39%
2160
16th to endNight
20%8%35%6%34446%31%
2304
November1st to 15thNight
17%6%35%5%35%447%36%
2574
16th to endNight
20%9%36%5%345%5%7%28%
2730
December1st to 15thNight
20%13%47%5%35%45%6%23%
2730
16th to endNight
20%13%6%9%6%45%5%5%5%19%
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
61%310%15%7%
1592
16th to endDay
65%310%13%6%
1872
February1st to 15thDay
64%311%16%4
1712
16th to endDay
56%312%18%7%1
1578
March1st to 15thDay
56%411%18%9%
2145
16th to endDay
49%29%22%13%1
2288
April1st to 15thDay
53%310%20%12%
2304
16th to endDay
46%29%22%15%3
2488
May1st to 15thDay
44%411%25%13%
2572
16th to endDay
38%314%25%15%1
2846
June1st to 15thDay
41%412%27%13%
2730
16th to endDay
39%5%14%25%14%
2730
July1st to 15thDay
32%5%11%27%19%2
2581
16th to endDay
39%5%15%24%12%2
2590
August1st to 15thDay
38%417%23%14%1
2474
16th to endDay
36%413%31%12%1
2588
September1st to 15thDay
39%5%14%27%12%1
2145
16th to endDay
39%413%31%10%
1958
October1st to 15thDay
48%311%24%10%1
1800
16th to endDay
57%414%16%5%
1920
November1st to 15thDay
49%415%22%7%1
1608
16th to endDay
56%416%17%5%
1560
December1st to 15thDay
64%313%15%3
1560
16th to endDay
65%411%15%3
1664
January1st to 15thNight
62%310%14%7%
2675
16th to endNight
59%212%17%6%
2704
February1st to 15thNight
60%410%18%6%
2482
16th to endNight
55%212%20%8%
2178
March1st to 15thNight
54%211%22%8%
2145
16th to endNight
45%28%24%17%2
2288
April1st to 15thNight
50%29%20%15%
1973
16th to endNight
40%39%23%18%4
1758
May1st to 15thNight
41%410%24%17%2
1706
16th to endNight
34%313%27%17%3
1625
June1st to 15thNight
37%411%26%17%1
1560
16th to endNight
35%313%26%18%1
1503
July1st to 15thNight
25%310%28%28%4
1480
16th to endNight
31%215%28%18%3
1664
August1st to 15thNight
30%417%32%13%2
1715
16th to endNight
32%311%32%17%1
1898
September1st to 15thNight
33%413%31%16%1
1813
16th to endNight
34%411%34%14%
2001
October1st to 15thNight
44%310%27%14%
2160
16th to endNight
53%312%20%8%
2304
November1st to 15thNight
46%312%22%12%1
2574
16th to endNight
53%416%20%5%
2730
December1st to 15thNight
60%413%16%5%
2730
16th to endNight
65%411%13%5%
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
16%15%41%15%11%1
99
16th to endDay
31%11%38%13%4
144
February1st to 15thDay
22%11%46%16%2
135
16th to endDay
23%13%38%22%1
130
March1st to 15thDay
20%10%31%25%12%
330
16th to endDay
21%6%32%26%9%2
352
April1st to 15thDay
25%8%30%26%8%1
330
16th to endDay
18%7%29%26%14%5%
319
May1st to 15thDay
20%426%25%14%9%
348
16th to endDay
14%324%29%21%7%
395
June1st to 15thDay
15%6%19%33%20%4
375
16th to endDay
15%420%30%23%5%
375
July1st to 15thDay
9%15%32%27%15%
365
16th to endDay
9%120%33%22%12%
390
August1st to 15thDay
9%116%29%25%16%
358
16th to endDay
13%214%27%23%19%
384
September1st to 15thDay
13%115%25%25%17%
315
16th to endDay
14%314%23%25%18%
314
October1st to 15thDay
21%5%24%22%16%8%
315
16th to endDay
24%9%27%27%11%
336
November1st to 15thDay
17%10%23%30%15%2
130
16th to endDay
21%7%36%25%7%1
90
December1st to 15thDay
15%15%37%23%6%1
90
16th to endDay
28%14%40%14%2
96
January1st to 15thNight
27%12%31%22%5%
780
16th to endNight
22%7%36%27%6%
832
February1st to 15thNight
22%11%37%23%4
764
16th to endNight
20%9%36%27%5%
683
March1st to 15thNight
22%8%33%27%7%
780
16th to endNight
18%7%30%30%11%1
832
April1st to 15thNight
22%7%33%29%6%
778
16th to endNight
16%5%28%34%13%1
602
May1st to 15thNight
16%224%35%18%2
536
16th to endNight
13%222%36%24%
407
June1st to 15thNight
13%224%39%18%1
390
16th to endNight
8%120%44%24%
390
July1st to 15thNight
6%16%44%28%2
370
16th to endNight
10%112%46%26%3
536
August1st to 15thNight
8%19%44%31%4
575
16th to endNight
11%111%37%32%5%
668
September1st to 15thNight
13%317%31%26%6%
720
16th to endNight
14%215%29%31%6%
717
October1st to 15thNight
19%422%28%20%3
720
16th to endNight
24%7%27%31%7%
768
November1st to 15thNight
20%6%26%31%13%1
760
16th to endNight
25%8%29%26%9%1
780
December1st to 15thNight
28%8%33%22%5%
780
16th to endNight
27%8%37%22%3
832
Page generated at 2018-08-30 05:34:22. Version ac04

Copyright 2018 A. Danko


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