This page made possible by the sponsorship of: Philip W. Davis.

Lovelady
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lovelady clear sky chart from 2005-11-06 to 2024-01-16.

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
51%
23823
24%
74245
18%
23766
57%
23766
31%
43787

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 10thNight
36%
950
28%
2458
11%
946
45%
946
32%
1559
January11th to 20thNight
34%
926
25%
2406
10%
926
43%
926
30%
1565
January21st to endNight
36%
990
27%
2574
11%
990
44%
990
30%
1687
February1st to 10thNight
29%
864
23%
2304
7%
864
39%
864
26%
1544
February11th to 20thNight
29%
704
20%
2098
9%
700
37%
700
24%
1361
February21st to endNight
24%
449
26%
1633
11%
449
40%
449
20%
1006
March1st to 10thNight
31%
540
22%
1980
13%
540
43%
540
21%
1227
March11th to 20thNight
32%
540
21%
1980
14%
540
41%
540
21%
1219
March21st to endNight
34%
594
23%
2178
15%
594
47%
594
26%
1272
April1st to 10thNight
35%
540
23%
1980
15%
540
48%
540
25%
1163
April11th to 20thNight
37%
533
24%
1801
16%
533
49%
533
27%
1073
April21st to endNight
37%
540
25%
1800
18%
540
51%
540
30%
1045
May1st to 10thNight
40%
540
21%
1697
16%
540
47%
540
29%
1020
May11th to 20thNight
50%
531
23%
1594
22%
531
56%
531
34%
941
May21st to endNight
61%
584
23%
1746
21%
582
68%
582
35%
1017
June1st to 10thNight
74%
540
20%
1620
23%
540
76%
540
41%
892
June11th to 20thNight
76%
540
23%
1620
25%
540
80%
540
50%
809
June21st to endNight
74%
540
22%
1620
24%
540
75%
540
36%
934
July1st to 10thNight
77%
525
17%
1575
21%
525
78%
525
35%
935
July11th to 20thNight
85%
522
23%
1566
27%
522
86%
522
47%
810
July21st to endNight
80%
591
18%
1673
21%
558
82%
558
39%
951
August1st to 10thNight
90%
537
28%
1601
33%
534
90%
534
58%
745
August11th to 20thNight
80%
534
24%
1655
28%
534
80%
534
38%
926
August21st to endNight
76%
594
18%
1986
20%
594
78%
594
31%
1169
September1st to 10thNight
75%
540
20%
1980
24%
540
76%
540
31%
1094
September11th to 20thNight
70%
540
20%
1980
23%
540
71%
540
26%
1183
September21st to endNight
73%
540
29%
1980
32%
540
74%
540
37%
1005
October1st to 10thNight
73%
634
33%
2074
30%
634
75%
634
45%
1022
October11th to 20thNight
60%
720
34%
2160
23%
720
67%
720
41%
1165
October21st to endNight
51%
792
34%
2376
22%
792
59%
792
38%
1332
November1st to 10thNight
59%
740
29%
2220
22%
740
64%
740
38%
1263
November11th to 20thNight
48%
760
28%
2280
19%
760
55%
760
33%
1327
November21st to endNight
41%
874
27%
2394
15%
874
48%
874
29%
1560
December1st to 10thNight
40%
950
27%
2470
14%
950
48%
950
31%
1626
December11th to 20thNight
33%
948
24%
2875
12%
948
39%
948
23%
1883
December21st to endNight
35%
1037
16%
4311
11%
1026
42%
1026
20%
2457

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
12%6%25%5%35%5%5%7%44%
74981
Night
12%5%2442445%7%50%
74833
TransparencyDay
38%7%12%19%18%7%
74706
Night
33%6%12%20%19%9%
74628
SeeingDay
12%6%20%26%26%11%
13853
Night
14%6%24%34%20%2
23833

By Month

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 10thDay
17%7%3432345%5%47%
1707
11th to 20thDay
19%8%35%423335%46%
1665
21st to endDay
17%9%24323345%47%
1782
February1st to 10thDay
22%7%35%5%23345%40%
1670
11th to 20thDay
22%7%36%5%3334440%
1749
21st to endDay
22%8%25%5%23336%41%
1620
March1st to 10thDay
19%9%46%5%25%45%6%37%
1980
11th to 20thDay
17%7%26%5%3445%7%40%
1980
21st to endDay
15%7%36%5%2445%5%44%
2178
April1st to 10thDay
13%7%46%6%35%447%39%
1980
11th to 20thDay
14%7%36%5%45%5%5%7%40%
2106
21st to endDay
12%5%35%5%36%6%47%46%
2160
May1st to 10thDay
11%6%36%6%35%6%6%7%39%
2258
11th to 20thDay
11%6%35%6%45%6%5%7%42%
2302
21st to endDay
9%5%36%6%47%7%7%10%35%
2531
June1st to 10thDay
6%426%6%47%6%7%11%41%
2340
11th to 20thDay
5%3246%46%6%7%10%47%
2340
21st to endDay
6%5%26%6%47%6%9%11%37%
2340
July1st to 10thDay
8%5%36%6%5%7%7%7%11%36%
2340
11th to 20thDay
4325%6%47%7%8%11%42%
2340
21st to endDay
5%325%7%48%7%7%11%42%
2546
August1st to 10thDay
5%2125%35%6%7%12%52%
2328
11th to 20thDay
6%425%6%46%6%7%10%45%
2243
21st to endDay
6%425%8%5%7%7%8%10%39%
2364
September1st to 10thDay
6%5%25%6%46%6%7%8%45%
1980
11th to 20thDay
11%5%37%5%36%6%6%7%41%
1980
21st to endDay
6%424435%5%5%8%53%
1980
October1st to 10thDay
7%3234345%5%6%59%
1866
11th to 20thDay
12%5%2442345%5%54%
1800
21st to endDay
15%5%23323336%56%
1980
November1st to 10thDay
11%5%25%5%35%446%50%
1858
11th to 20thDay
11%6%35%434346%52%
1900
21st to endDay
17%7%36%5%34445%44%
1782
December1st to 10thDay
15%7%25%434346%46%
1710
11th to 20thDay
18%8%25%5%35%445%42%
2161
21st to endDay
16%9%36%5%3434443%
3135
January1st to 10thNight
17%6%24323436%49%
2458
11th to 20thNight
18%6%14423435%48%
2406
21st to endNight
17%7%25%423335%48%
2574
February1st to 10thNight
17%9%35%5%33345%45%
2304
11th to 20thNight
21%6%35%43333445%
2098
21st to endNight
20%6%35%423346%44%
1633
March1st to 10thNight
18%7%35%5%34346%42%
1980
11th to 20thNight
16%6%35%5%35%45%7%42%
1980
21st to endNight
13%6%35%424445%49%
2178
April1st to 10thNight
11%6%36%4246%6%7%46%
1980
11th to 20thNight
12%5%36%425%45%7%46%
1801
21st to endNight
11%6%35%5%23447%51%
1800
May1st to 10thNight
9%5%35%5%345%6%10%45%
1697
11th to 20thNight
11%5%245%245%5%8%50%
1593
21st to endNight
7%425%4345%6%10%49%
1745
June1st to 10thNight
44243345%6%11%55%
1620
11th to 20thNight
321333445%11%62%
1620
21st to endNight
5%424435%5%8%10%49%
1620
July1st to 10thNight
5%4245%25%6%8%12%46%
1620
11th to 20thNight
3212325%6%6%10%60%
1620
21st to endNight
3313436%5%8%13%50%
1772
August1st to 10thNight
32122346%12%66%
1611
11th to 20thNight
5%423435%5%8%11%51%
1655
21st to endNight
5%4146%36%6%9%11%45%
1986
September1st to 10thNight
5%5%35%5%345%6%8%51%
1980
11th to 20thNight
9%6%26%6%35%45%6%47%
1980
21st to endNight
8%42332335%8%58%
1980
October1st to 10thNight
5%32442345%8%62%
2074
11th to 20thNight
12%423323445%59%
2160
21st to endNight
13%5%2332233460%
2376
November1st to 10thNight
11%424323447%57%
2220
11th to 20thNight
10%6%34424447%52%
2280
21st to endNight
15%7%35%5%34445%46%
2394
December1st to 10thNight
17%6%25%43435%6%46%
2470
11th to 20thNight
17%8%35%423345%45%
3036
21st to endNight
16%6%24423335%50%
4532

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 10thDay
39%48%16%24%8%
1708
11th to 20thDay
43%35%17%23%9%
1665
21st to endDay
41%35%15%23%12%
1782
February1st to 10thDay
48%46%14%19%10%
1670
11th to 20thDay
49%47%14%19%8%
1759
21st to endDay
45%5%7%15%17%12%
1620
March1st to 10thDay
48%6%9%12%20%7%
1980
11th to 20thDay
44%6%7%14%21%8%
1980
21st to endDay
42%5%9%16%22%6%
2178
April1st to 10thDay
45%6%8%18%15%8%
1980
11th to 20thDay
43%7%10%16%16%9%
2106
21st to endDay
37%7%8%19%23%5%
2160
May1st to 10thDay
42%7%11%19%15%6%
2258
11th to 20thDay
39%8%12%21%18%2
2306
21st to endDay
42%9%14%20%15%1
2531
June1st to 10thDay
34%9%16%26%14%2
2340
11th to 20thDay
30%9%16%27%15%2
2340
21st to endDay
37%10%17%22%13%1
2340
July1st to 10thDay
39%11%21%22%7%
2276
11th to 20thDay
31%12%18%25%13%1
2271
21st to endDay
31%12%21%26%9%1
2405
August1st to 10thDay
23%9%21%33%14%1
2314
11th to 20thDay
31%11%20%24%12%2
2243
21st to endDay
35%12%16%22%11%3
2364
September1st to 10thDay
33%10%14%19%16%7%
1980
11th to 20thDay
40%9%12%17%15%7%
1980
21st to endDay
29%8%12%21%19%12%
1980
October1st to 10thDay
26%5%11%22%22%14%
1866
11th to 20thDay
32%5%7%16%25%15%
1800
21st to endDay
31%46%15%27%16%
1980
November1st to 10thDay
34%6%10%19%22%9%
1858
11th to 20thDay
34%48%18%23%12%
1900
21st to endDay
43%5%8%17%19%9%
1782
December1st to 10thDay
40%5%11%17%18%8%
1710
11th to 20thDay
43%5%6%15%21%9%
2159
21st to endDay
44%5%6%13%24%8%
3135
January1st to 10thNight
38%36%19%21%13%
2458
11th to 20thNight
39%48%16%22%11%
2406
21st to endNight
40%45%14%21%15%
2574
February1st to 10thNight
44%45%15%18%15%
2304
11th to 20thNight
43%5%6%15%20%11%
2098
21st to endNight
44%38%13%15%16%
1633
March1st to 10thNight
43%5%9%14%18%11%
1980
11th to 20thNight
42%6%10%13%21%9%
1980
21st to endNight
36%6%11%16%21%10%
2178
April1st to 10thNight
36%6%11%18%17%11%
1980
11th to 20thNight
37%6%10%20%16%12%
1801
21st to endNight
34%6%9%19%25%7%
1800
May1st to 10thNight
34%8%14%18%20%7%
1697
11th to 20thNight
32%6%12%26%20%4
1594
21st to endNight
29%8%18%28%15%2
1746
June1st to 10thNight
23%9%19%31%16%1
1620
11th to 20thNight
17%7%19%34%18%4
1620
21st to endNight
27%9%16%29%16%2
1620
July1st to 10thNight
28%11%24%29%9%
1575
11th to 20thNight
18%10%27%32%12%1
1566
21st to endNight
22%13%28%26%11%
1673
August1st to 10thNight
12%8%27%36%16%2
1601
11th to 20thNight
25%9%23%28%13%2
1655
21st to endNight
29%11%23%24%10%4
1986
September1st to 10thNight
29%9%18%22%15%8%
1980
11th to 20thNight
36%8%16%18%15%7%
1980
21st to endNight
25%7%14%19%24%12%
1980
October1st to 10thNight
22%5%10%26%21%16%
2074
11th to 20thNight
27%5%8%18%25%18%
2160
21st to endNight
30%46%15%25%20%
2376
November1st to 10thNight
28%6%11%20%23%12%
2220
11th to 20thNight
33%5%9%18%23%13%
2280
21st to endNight
41%49%14%21%11%
2394
December1st to 10thNight
39%5%9%19%18%9%
2470
11th to 20thNight
43%47%12%22%13%
3037
21st to endNight
38%46%15%28%9%
4532

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 10thDay
26%9%36%21%6%2
270
11th to 20thDay
26%9%33%23%8%1
255
21st to endDay
19%15%39%20%7%
264
February1st to 10thDay
26%13%32%23%5%
240
11th to 20thDay
33%15%30%18%5%
240
21st to endDay
27%15%42%13%3
198
March1st to 10thDay
24%14%38%19%5%
240
11th to 20thDay
14%15%46%18%6%1
240
21st to endDay
16%17%37%23%6%1
264
April1st to 10thDay
19%13%39%25%4
240
11th to 20thDay
21%12%28%23%14%2
384
21st to endDay
15%7%34%32%10%2
420
May1st to 10thDay
14%10%32%30%12%2
521
11th to 20thDay
14%5%23%34%20%4
625
21st to endDay
9%423%36%24%5%
679
June1st to 10thDay
4211%35%35%12%
630
11th to 20thDay
5%111%37%36%10%
630
21st to endDay
8%210%28%36%16%
630
July1st to 10thDay
7%25%29%38%19%
621
11th to 20thDay
26%26%44%22%
618
21st to endDay
415%21%48%21%
684
August1st to 10thDay
4321%49%22%
626
11th to 20thDay
7%1319%48%23%
557
21st to endDay
10%1415%39%31%
483
September1st to 10thDay
4423%40%28%
270
11th to 20thDay
7%19%25%40%19%
270
21st to endDay
10%37%25%36%20%
270
October1st to 10thDay
5%115%34%31%14%
270
11th to 20thDay
9%7%23%34%16%10%
270
21st to endDay
23%10%23%21%17%6%
297
November1st to 10thDay
13%7%21%34%19%6%
270
11th to 20thDay
17%7%27%34%12%3
270
21st to endDay
18%16%31%20%13%1
270
December1st to 10thDay
18%7%34%23%13%5%
270
11th to 20thDay
26%13%29%24%7%1
270
21st to endDay
23%10%38%20%7%1
297
January1st to 10thNight
20%9%31%33%8%
950
11th to 20thNight
21%10%30%30%8%
926
21st to endNight
19%10%31%35%5%
990
February1st to 10thNight
21%11%33%29%5%
864
11th to 20thNight
24%8%36%28%4
704
21st to endNight
21%13%39%24%2
449
March1st to 10thNight
20%9%35%30%6%
540
11th to 20thNight
17%10%37%29%6%
540
21st to endNight
15%8%39%31%5%
594
April1st to 10thNight
13%8%41%31%6%
540
11th to 20thNight
14%9%36%30%11%
533
21st to endNight
14%9%37%28%11%1
540
May1st to 10thNight
10%9%39%33%8%1
540
11th to 20thNight
12%429%37%17%1
531
21st to endNight
7%423%42%22%2
584
June1st to 10thNight
5%211%41%37%4
540
11th to 20thNight
2216%48%31%2
540
21st to endNight
6%18%42%38%5%
540
July1st to 10thNight
416%42%41%7%
525
11th to 20thNight
416%40%44%6%
522
21st to endNight
317%37%47%5%
591
August1st to 10thNight
3340%49%5%
537
11th to 20thNight
6%1438%44%6%
534
21st to endNight
6%5%30%50%8%
594
September1st to 10thNight
7%16%32%46%7%
540
11th to 20thNight
11%17%30%44%6%
540
21st to endNight
9%211%31%41%5%
540
October1st to 10thNight
6%213%40%33%6%
634
11th to 20thNight
12%420%41%21%3
720
21st to endNight
15%6%24%33%20%2
792
November1st to 10thNight
13%320%40%23%1
740
11th to 20thNight
13%8%26%39%14%
760
21st to endNight
19%10%26%30%15%1
874
December1st to 10thNight
19%8%29%33%11%1
950
11th to 20thNight
24%8%30%33%6%
950
21st to endNight
20%8%31%33%8%
1045
Page generated at 2024-01-13 00:38:09. Version ac07

Copyright 2024 Attilla Danko


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