Lamping Homestead
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lamping Homestead 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
38%
15549
16%
47091
11%
15510
43%
15510
21%
32476

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
16%
719
11%
2327
5%
716
23%
716
9%
1864
January16th to endNight
16%
768
12%
2496
6%
768
23%
768
12%
1873
February1st to 15thNight
19%
701
10%
2287
6%
701
26%
701
13%
1709
February16th to endNight
16%
631
12%
1907
5%
631
24%
631
11%
1480
March1st to 15thNight
24%
720
16%
1991
9%
720
30%
720
17%
1460
March16th to endNight
25%
768
17%
2112
7%
768
32%
768
20%
1499
April1st to 15thNight
27%
718
14%
1892
6%
718
33%
718
21%
1348
April16th to endNight
33%
549
20%
1629
9%
549
40%
549
25%
1074
May1st to 15thNight
37%
540
14%
1620
8%
540
42%
540
19%
1158
May16th to endNight
53%
561
15%
1684
12%
561
56%
561
28%
1088
June1st to 15thNight
54%
485
16%
1565
14%
485
59%
485
28%
962
June16th to endNight
57%
528
15%
1608
13%
528
61%
528
29%
1005
July1st to 15thNight
58%
510
13%
1530
11%
510
60%
510
28%
984
July16th to endNight
67%
564
17%
1595
15%
531
70%
531
35%
944
August1st to 15thNight
65%
539
20%
1609
16%
536
67%
536
30%
1004
August16th to endNight
68%
612
25%
1758
19%
612
70%
612
37%
1016
September1st to 15thNight
60%
707
25%
1884
18%
707
62%
707
36%
1173
September16th to endNight
55%
657
25%
1815
20%
657
58%
657
31%
1156
October1st to 15thNight
50%
660
22%
1947
19%
660
56%
660
28%
1229
October16th to endNight
34%
704
20%
2112
15%
704
42%
704
21%
1422
November1st to 15thNight
43%
700
24%
2235
19%
700
52%
700
26%
1368
November16th to endNight
28%
720
15%
2415
10%
720
36%
720
15%
1720
December1st to 15thNight
22%
720
9%
2520
6%
720
26%
720
9%
1961
December16th to endNight
20%
768
10%
2553
4%
768
27%
768
11%
1979

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
16%8%36%5%3445%7%32%
47480
Night
16%8%36%5%24446%36%
47284
Cloud CoverDay
16%8%36%5%3445%7%32%
47490
Night
16%8%36%5%24446%36%
47288
TransparencyDay
49%6%11%19%11%1
47191
Night
47%5%11%20%12%2
47091
SeeingDay
21%9%23%21%15%7%
5400
Night
21%9%24%27%14%1
15555

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
22%13%6%10%6%2344420%
1611
16th to endDay
18%16%7%10%6%3333421%
1728
February1st to 15thDay
21%12%6%8%5%2444424%
1575
16th to endDay
16%15%5%9%5%24335%27%
1563
March1st to 15thDay
20%12%5%6%423335%31%
1957
16th to endDay
20%9%36%5%35%35%5%31%
2112
April1st to 15thDay
19%9%46%5%24346%33%
2055
16th to endDay
17%6%36%5%245%5%6%35%
2340
May1st to 15thDay
19%7%37%6%35%5%5%6%28%
2331
16th to endDay
13%6%35%6%35%5%6%8%36%
2431
June1st to 15thDay
13%5%245%35%6%6%9%37%
2340
16th to endDay
14%5%35%6%45%6%7%10%30%
2340
July1st to 15thDay
14%6%36%6%46%5%6%7%31%
2340
16th to endDay
12%5%35%5%36%5%7%9%35%
2465
August1st to 15thDay
10%5%25%7%46%8%8%10%31%
2340
16th to endDay
10%424435%6%7%8%41%
2430
September1st to 15thDay
16%42342445%7%43%
1993
16th to endDay
17%7%24433446%41%
1815
October1st to 15thDay
16%6%36%43445%8%36%
1683
16th to endDay
21%7%34423335%40%
1760
November1st to 15thDay
12%7%34433446%44%
1621
16th to endDay
20%11%46%422347%31%
1542
December1st to 15thDay
24%14%7%8%423335%22%
1440
16th to endDay
22%17%6%6%6%2334421%
1668
January1st to 15thNight
23%13%6%8%7%3443420%
2327
16th to endNight
19%12%5%9%6%3334426%
2496
February1st to 15thNight
19%12%37%5%34445%28%
2285
16th to endNight
19%13%5%9%5%345%4325%
1907
March1st to 15thNight
18%9%36%6%24446%31%
1979
16th to endNight
20%8%35%423337%35%
2112
April1st to 15thNight
18%7%26%42435%7%35%
1892
16th to endNight
14%6%26%5%3435%8%39%
1629
May1st to 15thNight
18%5%25%5%25%5%5%7%33%
1620
16th to endNight
10%5%25%5%25%36%9%41%
1682
June1st to 15thNight
8%5%245%245%6%10%44%
1565
16th to endNight
11%4144245%5%10%43%
1608
July1st to 15thNight
10%5%245%35%5%5%8%43%
1620
16th to endNight
8%323425%5%7%10%46%
1703
August1st to 15thNight
5%4246%35%5%7%9%43%
1620
16th to endNight
8%4143245%5%8%50%
1758
September1st to 15thNight
11%414424345%52%
1884
16th to endNight
14%5%2442345%7%44%
1815
October1st to 15thNight
13%6%25%43445%6%44%
1947
16th to endNight
21%6%245%23445%38%
2112
November1st to 15thNight
15%6%23323346%45%
2235
16th to endNight
20%8%36%6%35%436%31%
2415
December1st to 15thNight
23%13%5%8%5%3444422%
2520
16th to endNight
21%14%6%7%5%33345%22%
2553

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
22%14%6%10%6%2344420%
1611
16th to endDay
18%17%6%10%6%3334421%
1728
February1st to 15thDay
21%13%6%7%5%2434425%
1575
16th to endDay
16%15%5%9%5%24335%27%
1563
March1st to 15thDay
20%11%5%7%424335%31%
1968
16th to endDay
20%9%36%5%34346%31%
2111
April1st to 15thDay
19%9%45%6%24346%33%
2055
16th to endDay
17%6%36%5%25%5%46%35%
2340
May1st to 15thDay
19%7%36%6%35%5%5%6%29%
2331
16th to endDay
12%6%25%6%35%46%8%36%
2431
June1st to 15thDay
12%5%25%5%35%6%6%8%38%
2340
16th to endDay
14%6%25%5%36%6%7%10%30%
2340
July1st to 15thDay
14%6%36%5%46%6%6%8%31%
2340
16th to endDay
11%5%25%5%36%6%7%9%34%
2465
August1st to 15thDay
10%5%35%6%47%7%8%10%30%
2340
16th to endDay
10%425%426%6%7%9%41%
2430
September1st to 15thDay
15%42442445%8%43%
1993
16th to endDay
17%7%24433346%41%
1815
October1st to 15thDay
16%6%26%5%345%48%36%
1683
16th to endDay
22%7%3442333440%
1760
November1st to 15thDay
13%7%25%42335%5%44%
1621
16th to endDay
20%11%46%42335%6%31%
1542
December1st to 15thDay
23%14%8%8%423335%22%
1440
16th to endDay
22%17%5%7%5%2434421%
1668
January1st to 15thNight
22%13%7%8%7%3443420%
2327
16th to endNight
19%12%6%8%6%33345%26%
2496
February1st to 15thNight
19%13%37%5%44445%28%
2278
16th to endNight
19%13%5%9%5%345%3325%
1907
March1st to 15thNight
19%9%46%6%24446%32%
1991
16th to endNight
20%8%36%423336%36%
2112
April1st to 15thNight
18%7%35%5%2445%7%35%
1892
16th to endNight
14%6%36%5%2435%7%39%
1629
May1st to 15thNight
18%6%26%5%26%6%5%7%33%
1619
16th to endNight
10%5%25%5%25%46%10%41%
1682
June1st to 15thNight
7%5%25%4245%6%10%44%
1565
16th to endNight
11%4144245%5%9%44%
1608
July1st to 15thNight
10%5%25%5%35%5%5%8%43%
1620
16th to endNight
7%3234245%7%10%47%
1703
August1st to 15thNight
5%4246%36%6%6%10%43%
1620
16th to endNight
8%4233245%6%8%50%
1758
September1st to 15thNight
11%423423346%51%
1884
16th to endNight
13%5%24423447%45%
1815
October1st to 15thNight
13%6%25%434346%44%
1947
16th to endNight
21%6%245%33445%39%
2112
November1st to 15thNight
16%7%23323346%45%
2235
16th to endNight
19%9%36%6%25%445%31%
2415
December1st to 15thNight
23%13%5%8%5%3444422%
2520
16th to endNight
21%15%5%7%5%34345%22%
2553

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
66%5%9%13%4
1612
16th to endDay
66%211%14%3
1728
February1st to 15thDay
61%412%13%6%
1577
16th to endDay
60%410%17%7%
1563
March1st to 15thDay
56%310%20%7%1
1968
16th to endDay
53%5%9%19%10%1
2112
April1st to 15thDay
51%5%9%18%13%2
2055
16th to endDay
48%6%9%17%15%4
2340
May1st to 15thDay
53%6%11%17%8%1
2331
16th to endDay
43%7%14%20%11%1
2435
June1st to 15thDay
40%8%13%23%13%1
2340
16th to endDay
45%10%13%16%13%
2340
July1st to 15thDay
47%8%11%17%12%2
2201
16th to endDay
41%9%12%22%12%1
2310
August1st to 15thDay
42%9%13%20%12%
2327
16th to endDay
36%7%13%25%13%3
2430
September1st to 15thDay
38%5%9%24%18%3
1993
16th to endDay
43%47%22%20%
1815
October1st to 15thDay
44%6%11%20%15%
1683
16th to endDay
47%310%25%12%
1760
November1st to 15thDay
41%410%24%14%4
1621
16th to endDay
53%412%18%11%
1542
December1st to 15thDay
66%39%14%4
1440
16th to endDay
66%49%14%4
1668
January1st to 15thNight
67%38%12%6%
2327
16th to endNight
60%312%16%5%
2496
February1st to 15thNight
58%411%16%7%
2287
16th to endNight
61%48%18%5%
1907
March1st to 15thNight
53%5%9%21%8%1
1991
16th to endNight
50%411%21%10%1
2112
April1st to 15thNight
48%5%9%19%14%1
1892
16th to endNight
42%5%12%17%16%5%
1629
May1st to 15thNight
47%8%12%17%10%2
1620
16th to endNight
38%7%16%22%13%2
1684
June1st to 15thNight
33%9%12%25%16%1
1565
16th to endNight
35%8%14%21%17%3
1608
July1st to 15thNight
38%7%13%20%17%2
1530
16th to endNight
28%9%17%23%18%2
1595
August1st to 15thNight
34%8%13%23%17%1
1609
16th to endNight
29%6%11%28%17%5%
1758
September1st to 15thNight
34%5%12%19%22%5%
1884
16th to endNight
37%5%9%23%22%1
1815
October1st to 15thNight
38%5%11%24%17%2
1947
16th to endNight
47%38%24%14%1
2112
November1st to 15thNight
40%310%21%18%5%
2235
16th to endNight
54%49%18%11%1
2415
December1st to 15thNight
65%410%14%5%
2520
16th to endNight
63%412%14%5%
2553

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
33%21%32%5%5%2
90
16th to endDay
40%25%20%12%1
96
February1st to 15thDay
37%23%32%5%1
90
16th to endDay
24%22%41%11%
81
March1st to 15thDay
33%13%27%18%5%
258
16th to endDay
26%15%35%13%7%1
288
April1st to 15thDay
26%12%30%18%11%
270
16th to endDay
23%10%30%17%11%7%
270
May1st to 15thDay
27%15%23%17%12%4
288
16th to endDay
18%7%24%23%16%9%
331
June1st to 15thDay
13%6%24%31%17%6%
315
16th to endDay
19%8%27%22%15%6%
315
July1st to 15thDay
21%321%25%17%9%
305
16th to endDay
12%315%27%24%15%
326
August1st to 15thDay
14%215%30%22%15%
313
16th to endDay
12%215%28%23%17%
332
September1st to 15thDay
17%415%25%26%12%
299
16th to endDay
20%5%16%23%25%9%
254
October1st to 15thDay
17%5%22%27%22%4
255
16th to endDay
23%12%29%22%10%1
272
November1st to 15thDay
18%9%21%22%21%6%
129
16th to endDay
27%22%23%20%5%1
77
December1st to 15thDay
30%28%26%5%8%1
60
16th to endDay
37%27%27%42
86
January1st to 15thNight
31%18%29%17%3
720
16th to endNight
27%17%32%20%1
768
February1st to 15thNight
27%15%32%23%
704
16th to endNight
27%17%33%19%2
631
March1st to 15thNight
26%15%30%23%4
720
16th to endNight
25%13%31%20%7%1
768
April1st to 15thNight
23%16%30%22%6%
718
16th to endNight
18%8%34%26%11%1
549
May1st to 15thNight
18%9%26%31%13%
540
16th to endNight
14%223%31%23%4
563
June1st to 15thNight
11%223%39%21%1
485
16th to endNight
13%320%36%24%2
528
July1st to 15thNight
11%218%38%24%4
510
16th to endNight
9%214%29%37%6%
564
August1st to 15thNight
10%12%40%32%4
539
16th to endNight
11%113%34%33%5%
612
September1st to 15thNight
14%216%31%29%4
707
16th to endNight
16%416%27%30%4
657
October1st to 15thNight
17%5%21%31%22%1
660
16th to endNight
24%12%24%27%9%1
704
November1st to 15thNight
20%8%23%30%16%1
700
16th to endNight
26%14%25%22%9%
720
December1st to 15thNight
31%14%24%23%5%
720
16th to endNight
29%14%30%23%1
768
Page generated at 2017-09-13 07:39:14. Version ac04

Copyright 2017 A. Danko


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