Livingston
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Livingston clear sky chart from 2005-11-06 to 2024-01-13.

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
35%
24036
15%
74541
9%
23980
42%
23980
22%
48146

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
20%
950
11%
2836
5%
946
26%
946
18%
1948
January11th to 20thNight
19%
822
14%
2628
7%
822
27%
822
17%
1787
January21st to endNight
17%
792
14%
2574
5%
792
28%
792
16%
1767
February1st to 10thNight
16%
720
8%
2340
3%
720
23%
720
10%
1776
February11th to 20thNight
16%
703
9%
2273
2%
700
24%
700
13%
1669
February21st to endNight
24%
592
12%
1875
4%
592
33%
592
15%
1360
March1st to 10thNight
27%
720
13%
2026
5%
720
35%
720
19%
1429
March11th to 20thNight
34%
720
15%
1980
8%
720
39%
720
23%
1336
March21st to endNight
32%
792
9%
2178
5%
792
35%
792
16%
1619
April1st to 10thNight
27%
601
10%
1861
4%
601
34%
601
17%
1319
April11th to 20thNight
30%
533
13%
1624
6%
533
36%
533
16%
1168
April21st to endNight
38%
540
11%
1620
7%
540
40%
540
18%
1145
May1st to 10thNight
42%
540
9%
1620
7%
540
44%
540
20%
1127
May11th to 20thNight
46%
531
11%
1418
9%
531
47%
531
21%
1030
May21st to endNight
42%
584
8%
1552
4%
582
45%
582
18%
1177
June1st to 10thNight
53%
378
10%
1278
10%
378
55%
378
18%
885
June11th to 20thNight
45%
360
12%
1260
8%
360
51%
360
20%
822
June21st to endNight
66%
360
18%
1260
15%
360
73%
360
36%
668
July1st to 10thNight
76%
350
17%
1225
21%
350
78%
350
40%
617
July11th to 20thNight
68%
348
25%
1218
26%
348
76%
348
44%
569
July21st to endNight
63%
577
23%
1611
22%
545
68%
545
48%
801
August1st to 10thNight
66%
537
20%
1602
17%
534
69%
534
37%
878
August11th to 20thNight
68%
534
25%
1602
20%
534
71%
534
41%
855
August21st to endNight
63%
594
27%
1790
22%
594
66%
594
39%
967
September1st to 10thNight
60%
540
25%
1800
22%
540
65%
540
38%
949
September11th to 20thNight
59%
696
24%
1956
18%
696
64%
696
38%
1124
September21st to endNight
49%
720
27%
1980
18%
720
55%
720
36%
1182
October1st to 10thNight
43%
720
18%
2145
11%
720
49%
720
25%
1385
October11th to 20thNight
32%
720
23%
2160
12%
720
43%
720
25%
1364
October21st to endNight
31%
792
18%
2438
9%
792
40%
792
22%
1563
November1st to 10thNight
25%
833
17%
2498
7%
833
34%
833
22%
1635
November11th to 20thNight
22%
950
17%
2660
5%
950
33%
950
20%
1808
November21st to endNight
25%
950
17%
2660
6%
950
35%
950
25%
1695
December1st to 10thNight
24%
950
14%
2660
6%
950
31%
950
18%
1880
December11th to 20thNight
19%
950
14%
3324
4%
949
28%
949
17%
2064
December21st to endNight
18%
1037
9%
5009
2%
1026
28%
1026
10%
2778

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
6%7%36%6%36%6%7%9%43%
74718
Night
5%7%36%5%35%6%6%8%44%
75021
TransparencyDay
39%9%15%20%12%4
74417
Night
39%9%17%21%11%3
74844
SeeingDay
15%18%31%23%12%2
14365
Night
11%16%32%29%11%1
24045

By Month

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 10thDay
37%38%8%37%7%8%10%37%
1329
11th to 20thDay
28%5%7%7%36%7%6%12%37%
1407
21st to endDay
210%49%7%46%5%7%10%36%
1782
February1st to 10thDay
310%49%8%5%6%7%7%9%32%
1620
11th to 20thDay
19%5%11%8%5%6%6%7%9%32%
1575
21st to endDay
39%5%9%9%5%8%8%8%9%28%
1377
March1st to 10thDay
37%38%8%47%7%8%10%34%
1934
11th to 20thDay
38%48%7%46%6%8%10%37%
1980
21st to endDay
7%11%49%8%5%6%6%6%8%29%
2178
April1st to 10thDay
7%12%37%7%5%5%6%8%10%31%
2097
11th to 20thDay
7%10%49%8%46%5%7%8%31%
2281
21st to endDay
12%13%47%6%45%5%7%8%30%
2340
May1st to 10thDay
10%10%36%5%36%7%6%8%35%
2340
11th to 20thDay
12%10%35%5%36%6%8%10%32%
2475
21st to endDay
16%9%37%6%37%6%7%9%27%
2724
June1st to 10thDay
12%6%35%5%36%6%8%10%35%
2679
11th to 20thDay
9%7%36%7%5%6%7%7%8%37%
2700
21st to endDay
4313436%6%6%10%54%
2700
July1st to 10thDay
3212425%7%8%9%56%
2700
11th to 20thDay
2213435%5%6%7%61%
2700
21st to endDay
3213335%5%6%8%60%
2608
August1st to 10thDay
5%4134345%7%8%55%
2328
11th to 20thDay
5%313335%5%5%8%59%
2299
21st to endDay
4414435%5%6%8%56%
2566
September1st to 10thDay
6%42432445%6%61%
2160
11th to 20thDay
7%5%244345%6%6%54%
2001
21st to endDay
8%5%134245%6%7%54%
1980
October1st to 10thDay
11%9%37%43446%6%44%
1814
11th to 20thDay
10%8%25%5%345%46%48%
1800
21st to endDay
5%8%36%6%35%6%7%8%41%
1914
November1st to 10thDay
5%8%47%7%36%7%5%7%41%
1561
11th to 20thDay
47%36%6%37%7%7%8%42%
1520
21st to endDay
38%35%6%36%6%7%8%45%
1520
December1st to 10thDay
25%47%6%5%6%7%7%10%41%
1520
11th to 20thDay
27%36%5%46%9%10%12%37%
1767
21st to endDay
39%38%5%46%6%6%8%42%
2442
January1st to 10thNight
25%37%8%5%7%6%7%10%41%
2836
11th to 20thNight
27%38%6%45%7%6%10%42%
2628
21st to endNight
310%47%6%36%6%7%9%39%
2574
February1st to 10thNight
310%6%11%8%47%7%8%8%29%
2340
11th to 20thNight
310%5%10%8%5%6%6%7%7%33%
2272
21st to endNight
29%6%10%8%46%6%7%8%33%
1875
March1st to 10thNight
38%48%6%46%7%6%9%41%
2026
11th to 20thNight
49%36%6%35%5%7%10%42%
1980
21st to endNight
6%13%5%8%7%36%5%5%8%33%
2178
April1st to 10thNight
9%11%47%6%35%6%5%7%37%
1861
11th to 20thNight
5%12%48%6%37%7%7%8%34%
1624
21st to endNight
13%12%36%5%345%5%7%37%
1620
May1st to 10thNight
11%9%35%6%35%5%6%9%37%
1620
11th to 20thNight
12%11%35%5%445%6%10%35%
1417
21st to endNight
16%9%37%5%35%6%7%9%30%
1552
June1st to 10thNight
12%5%26%6%46%6%8%8%37%
1278
11th to 20thNight
12%6%35%5%45%6%8%8%39%
1260
21st to endNight
5%32343448%8%55%
1260
July1st to 10thNight
5%4233235%8%8%57%
1260
11th to 20thNight
2313325%5%7%8%62%
1260
21st to endNight
22135%245%6%7%63%
1705
August1st to 10thNight
44244346%7%11%52%
1611
11th to 20thNight
5%3124245%7%8%59%
1602
21st to endNight
6%3135%345%7%8%55%
1790
September1st to 10thNight
6%5%2442345%7%56%
1800
11th to 20thNight
8%6%243245%6%9%53%
1956
21st to endNight
10%7%24423346%55%
1980
October1st to 10thNight
12%8%45%42445%7%46%
2145
11th to 20thNight
9%8%36%5%24446%49%
2160
21st to endNight
7%7%35%5%35%6%5%9%46%
2438
November1st to 10thNight
6%8%36%5%35%5%7%10%44%
2498
11th to 20thNight
48%36%5%35%6%7%8%44%
2660
21st to endNight
37%36%5%345%7%9%48%
2660
December1st to 10thNight
27%5%8%7%46%6%7%7%41%
2660
11th to 20thNight
36%36%5%35%7%8%10%45%
3421
21st to endNight
27%47%5%35%6%6%8%47%
5214

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
45%9%19%19%7%1
1329
11th to 20thDay
43%11%19%17%8%2
1407
21st to endDay
47%9%15%19%8%1
1782
February1st to 10thDay
54%10%13%16%5%
1620
11th to 20thDay
52%9%15%18%5%1
1584
21st to endDay
53%12%10%13%10%3
1377
March1st to 10thDay
46%10%18%21%5%
1934
11th to 20thDay
44%11%18%18%8%1
1980
21st to endDay
55%10%18%13%4
2178
April1st to 10thDay
50%11%15%19%5%
2097
11th to 20thDay
52%10%16%17%5%
2284
21st to endDay
54%8%14%18%5%
2340
May1st to 10thDay
46%11%15%21%7%
2340
11th to 20thDay
46%12%18%18%6%
2479
21st to endDay
53%12%17%14%3
2724
June1st to 10thDay
44%12%19%20%6%
2679
11th to 20thDay
44%10%14%18%12%2
2700
21st to endDay
24%9%17%24%21%5%
2700
July1st to 10thDay
21%9%14%29%21%6%
2626
11th to 20thDay
22%6%10%21%24%16%
2619
21st to endDay
21%6%10%18%28%16%
2463
August1st to 10thDay
26%7%12%24%22%9%
2313
11th to 20thDay
24%5%11%26%25%9%
2299
21st to endDay
25%6%11%25%23%9%
2566
September1st to 10thDay
25%411%21%27%12%
2160
11th to 20thDay
30%7%13%21%22%6%
2001
21st to endDay
30%6%13%29%17%5%
1980
October1st to 10thDay
43%6%12%22%14%2
1814
11th to 20thDay
41%5%16%23%12%3
1800
21st to endDay
42%9%17%22%9%1
1914
November1st to 10thDay
44%9%14%20%9%3
1561
11th to 20thDay
42%11%18%20%8%2
1520
21st to endDay
39%8%16%23%13%1
1520
December1st to 10thDay
40%11%20%18%8%3
1520
11th to 20thDay
38%16%24%18%31
1765
21st to endDay
41%9%9%23%9%9%
2442
January1st to 10thNight
42%11%22%19%5%1
2836
11th to 20thNight
44%9%18%19%8%2
2628
21st to endNight
46%9%19%17%9%1
2574
February1st to 10thNight
54%11%14%15%6%
2340
11th to 20thNight
52%9%15%16%7%1
2273
21st to endNight
51%9%14%16%9%2
1875
March1st to 10thNight
42%12%17%20%8%1
2026
11th to 20thNight
39%10%20%23%8%1
1980
21st to endNight
51%9%19%18%3
2178
April1st to 10thNight
48%9%16%20%7%
1861
11th to 20thNight
47%12%15%20%6%
1624
21st to endNight
49%8%18%20%5%
1620
May1st to 10thNight
45%10%18%22%5%1
1620
11th to 20thNight
43%13%16%20%7%
1418
21st to endNight
48%14%19%15%3
1552
June1st to 10thNight
42%14%18%20%6%
1278
11th to 20thNight
41%10%17%20%10%2
1260
21st to endNight
24%10%15%28%18%6%
1260
July1st to 10thNight
21%9%15%30%21%4
1225
11th to 20thNight
19%6%13%26%23%14%
1218
21st to endNight
18%6%12%23%28%12%
1611
August1st to 10thNight
23%11%16%27%16%7%
1602
11th to 20thNight
22%9%13%25%23%8%
1602
21st to endNight
25%7%13%25%23%7%
1790
September1st to 10thNight
27%5%11%20%25%11%
1800
11th to 20thNight
27%8%16%24%21%5%
1956
21st to endNight
33%412%28%20%3
1980
October1st to 10thNight
39%8%15%22%14%2
2145
11th to 20thNight
39%6%13%26%13%3
2160
21st to endNight
38%9%18%22%12%1
2438
November1st to 10thNight
39%9%18%22%10%2
2498
11th to 20thNight
41%9%20%22%7%1
2660
21st to endNight
35%7%20%23%12%2
2660
December1st to 10thNight
43%12%18%17%9%2
2660
11th to 20thNight
35%12%25%22%5%
3422
21st to endNight
35%10%14%24%8%9%
5214

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
21%18%36%18%7%
180
11th to 20thDay
17%29%30%15%7%2
175
21st to endDay
15%25%46%9%32
264
February1st to 10thDay
23%28%37%10%2
240
11th to 20thDay
18%30%34%13%32
240
21st to endDay
21%24%35%16%41
243
March1st to 10thDay
17%28%36%15%31
420
11th to 20thDay
16%25%32%18%7%2
420
21st to endDay
20%22%33%17%6%2
462
April1st to 10thDay
22%24%36%14%4
420
11th to 20thDay
19%29%30%17%4
412
21st to endDay
23%22%27%18%8%2
420
May1st to 10thDay
17%18%27%26%9%2
423
11th to 20thDay
23%13%23%22%15%5%
622
21st to endDay
19%14%22%22%19%4
679
June1st to 10thDay
13%14%25%25%18%4
630
11th to 20thDay
17%21%28%21%11%2
630
21st to endDay
8%8%28%36%19%2
630
July1st to 10thDay
5%9%26%33%23%4
621
11th to 20thDay
410%33%34%18%1
618
21st to endDay
48%32%35%17%4
539
August1st to 10thDay
10%7%34%31%15%2
447
11th to 20thDay
7%9%27%35%18%3
437
21st to endDay
6%11%34%25%19%5%
495
September1st to 10thDay
7%15%34%29%13%3
450
11th to 20thDay
13%14%31%28%11%3
450
21st to endDay
16%18%28%23%13%3
450
October1st to 10thDay
16%17%27%23%12%5%
284
11th to 20thDay
20%21%33%14%7%4
270
21st to endDay
20%28%28%16%6%2
297
November1st to 10thDay
19%23%34%17%6%1
270
11th to 20thDay
14%30%40%11%4
270
21st to endDay
16%24%39%17%4
270
December1st to 10thDay
16%31%31%16%6%
270
11th to 20thDay
21%31%33%13%2
219
21st to endDay
20%25%31%17%7%1
198
January1st to 10thNight
9%22%42%22%5%
950
11th to 20thNight
10%25%39%18%6%1
822
21st to endNight
8%23%47%16%6%1
792
February1st to 10thNight
10%26%39%20%5%
720
11th to 20thNight
11%20%45%17%7%1
704
21st to endNight
11%19%39%24%6%1
592
March1st to 10thNight
7%18%39%28%7%1
720
11th to 20thNight
9%17%32%31%10%1
720
21st to endNight
11%15%32%31%9%2
792
April1st to 10thNight
15%16%36%25%7%1
601
11th to 20thNight
11%16%36%30%6%
533
21st to endNight
18%13%24%31%13%1
540
May1st to 10thNight
16%10%26%33%14%
540
11th to 20thNight
20%10%19%32%19%1
531
21st to endNight
20%9%20%29%22%1
584
June1st to 10thNight
13%8%18%38%21%1
378
11th to 20thNight
13%11%28%38%10%1
360
21st to endNight
7%417%47%24%1
360
July1st to 10thNight
7%211%47%31%2
350
11th to 20thNight
35%19%53%18%
348
21st to endNight
3423%45%24%1
577
August1st to 10thNight
3420%51%21%1
537
11th to 20thNight
5%419%49%23%1
534
21st to endNight
7%5%19%43%24%2
594
September1st to 10thNight
7%422%44%20%2
540
11th to 20thNight
9%8%18%40%22%3
696
21st to endNight
15%9%23%35%18%1
720
October1st to 10thNight
16%10%24%34%13%2
720
11th to 20thNight
14%13%35%25%10%2
720
21st to endNight
10%20%34%27%7%2
792
November1st to 10thNight
11%20%41%21%7%1
833
11th to 20thNight
14%21%40%22%3
950
21st to endNight
7%21%42%25%41
950
December1st to 10thNight
8%24%38%25%5%1
950
11th to 20thNight
10%24%41%20%41
950
21st to endNight
10%24%40%19%7%
1045
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