New Liskeard
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Liskeard clear sky chart from 2005-11-06 to 2024-01-17.

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
27%
23204
7%
74886
4%
23164
31%
23164
7%
63310

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
16%
948
3%
2838
2%
946
18%
946
4%
2582
January11th to 20thNight
20%
935
3%
2803
1%
935
22%
935
3%
2552
January21st to endNight
29%
821
6%
2621
4%
821
32%
821
7%
2267
February1st to 10thNight
22%
720
6%
2340
3%
720
26%
720
5%
2037
February11th to 20thNight
18%
703
5%
2275
2%
700
22%
700
6%
1980
February21st to endNight
19%
592
8%
1924
2%
592
25%
592
7%
1634
March1st to 10thNight
22%
720
8%
2017
4%
720
26%
720
8%
1737
March11th to 20thNight
22%
720
8%
1980
5%
720
26%
720
8%
1703
March21st to endNight
27%
792
10%
2178
4%
792
32%
792
11%
1795
April1st to 10thNight
25%
720
9%
1815
4%
720
27%
720
10%
1547
April11th to 20thNight
30%
571
11%
1635
7%
571
32%
571
10%
1338
April21st to endNight
32%
540
10%
1620
6%
540
36%
540
10%
1316
May1st to 10thNight
34%
432
10%
1512
9%
432
38%
432
10%
1195
May11th to 20thNight
34%
354
13%
1416
12%
354
43%
354
10%
1084
May21st to endNight
38%
388
9%
1504
9%
388
44%
388
11%
1122
June1st to 10thNight
38%
360
5%
1260
4%
360
41%
360
9%
1013
June11th to 20thNight
40%
360
10%
1260
9%
360
43%
360
13%
923
June21st to endNight
42%
360
6%
1260
5%
360
46%
360
10%
979
July1st to 10thNight
43%
350
7%
1225
8%
350
45%
350
11%
931
July11th to 20thNight
47%
348
10%
1218
10%
348
52%
348
13%
917
July21st to endNight
50%
394
8%
1428
8%
372
52%
372
10%
1102
August1st to 10thNight
47%
532
6%
1596
4%
530
50%
530
12%
1276
August11th to 20thNight
51%
534
11%
1598
7%
534
54%
534
16%
1202
August21st to endNight
41%
612
9%
1800
6%
612
43%
612
12%
1429
September1st to 10thNight
42%
720
9%
1800
4%
720
43%
720
16%
1424
September11th to 20thNight
37%
720
9%
1890
5%
720
40%
720
12%
1549
September21st to endNight
40%
720
9%
2020
6%
720
42%
720
12%
1633
October1st to 10thNight
29%
720
10%
2160
7%
720
33%
720
9%
1802
October11th to 20thNight
20%
720
5%
2160
4%
720
23%
720
6%
1890
October21st to endNight
19%
792
6%
2456
3%
792
22%
792
6%
2137
November1st to 10thNight
19%
740
7%
2592
4%
740
24%
740
6%
2187
November11th to 20thNight
17%
760
5%
2660
4%
760
20%
760
4%
2373
November21st to endNight
15%
760
2%
2660
2%
760
16%
760
3%
2417
December1st to 10thNight
15%
760
2%
2660
1%
760
16%
760
2%
2448
December11th to 20thNight
17%
950
3%
3513
1%
949
19%
949
3%
3131
December21st to endNight
17%
1036
3%
5192
1%
1026
18%
1026
2%
4658

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%11%48%7%45%5%5%7%28%
74724
Night
16%12%5%9%7%45%45%6%27%
75099
TransparencyDay
37%38%8%12%5%
74416
Night
40%37%7%10%5%
74942
SeeingDay
21%14%30%23%10%3
14029
Night
23%11%30%26%8%1
23216

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 10thDay
14%17%9%12%9%5%5%5%5%5%13%
1328
11th to 20thDay
15%15%7%13%9%46%5%5%7%14%
1302
21st to endDay
11%15%7%12%12%5%5%5%5%6%17%
1730
February1st to 10thDay
7%14%7%13%11%6%6%6%5%6%18%
1620
11th to 20thDay
11%16%6%10%9%46%5%6%6%21%
1573
21st to endDay
12%16%6%9%9%5%6%6%5%423%
1332
March1st to 10thDay
13%12%6%11%8%445%5%5%25%
1936
11th to 20thDay
12%12%5%11%8%45%5%5%6%29%
1980
21st to endDay
15%12%5%7%7%44345%33%
2178
April1st to 10thDay
18%13%5%9%7%35%45%6%25%
2144
11th to 20thDay
20%10%37%6%3445%6%32%
2289
21st to endDay
21%10%46%5%34346%32%
2340
May1st to 10thDay
18%9%36%6%35%5%5%7%32%
2448
11th to 20thDay
20%10%47%6%34446%33%
2478
21st to endDay
17%7%35%5%35%5%5%8%37%
2769
June1st to 10thDay
19%8%36%6%36%6%5%8%30%
2700
11th to 20thDay
14%7%35%6%45%6%6%8%35%
2700
21st to endDay
17%7%46%6%46%5%5%7%32%
2700
July1st to 10thDay
15%6%36%5%35%5%6%8%38%
2700
11th to 20thDay
13%5%26%6%46%7%6%10%35%
2700
21st to endDay
11%6%26%7%46%7%7%10%34%
2803
August1st to 10thDay
14%6%37%7%46%6%7%8%31%
2329
11th to 20thDay
16%6%25%6%346%6%7%37%
2303
21st to endDay
14%7%37%7%46%5%6%9%33%
2538
September1st to 10thDay
16%6%36%6%46%5%5%8%36%
2160
11th to 20thDay
19%8%36%5%35%45%7%35%
2066
21st to endDay
21%9%37%6%35%446%32%
1940
October1st to 10thDay
20%10%47%6%35%5%46%31%
1800
11th to 20thDay
24%15%5%7%7%445%4421%
1800
21st to endDay
24%16%5%10%6%4445%5%16%
1894
November1st to 10thDay
19%13%6%9%7%25%446%24%
1486
11th to 20thDay
18%13%6%12%10%45%5%5%6%17%
1520
21st to endDay
21%18%7%12%9%5%5%435%11%
1520
December1st to 10thDay
15%19%8%11%8%36%5%5%416%
1516
11th to 20thDay
16%17%7%8%9%45%45%5%20%
1671
21st to endDay
17%20%7%18%9%3443313%
2431
January1st to 10thNight
15%17%8%14%9%45%5%5%416%
2838
11th to 20thNight
14%16%6%13%8%47%6%5%5%18%
2803
21st to endNight
12%14%6%11%10%6%7%5%6%6%18%
2621
February1st to 10thNight
11%13%6%11%11%6%7%6%5%6%18%
2340
11th to 20thNight
12%15%8%10%9%46%445%24%
2273
21st to endNight
12%14%7%11%9%5%5%5%46%23%
1924
March1st to 10thNight
11%15%8%9%8%46%35%426%
2007
11th to 20thNight
14%15%5%9%8%44446%26%
1979
21st to endNight
14%12%38%6%3445%6%35%
2178
April1st to 10thNight
20%13%6%8%5%3445%5%28%
1815
11th to 20thNight
19%11%48%5%3445%5%33%
1635
21st to endNight
19%10%47%6%2445%6%35%
1620
May1st to 10thNight
16%10%5%7%6%4445%6%34%
1512
11th to 20thNight
19%6%36%6%45%5%6%6%33%
1415
21st to endNight
15%6%36%5%35%5%5%7%40%
1503
June1st to 10thNight
17%7%36%6%36%7%6%7%33%
1260
11th to 20thNight
19%5%244345%5%8%43%
1260
21st to endNight
15%5%36%5%35%5%6%9%37%
1260
July1st to 10thNight
12%5%345%35%5%6%10%41%
1260
11th to 20thNight
13%436%5%35%5%6%9%42%
1260
21st to endNight
10%5%26%6%46%6%7%8%40%
1512
August1st to 10thNight
11%6%36%8%45%5%5%9%38%
1606
11th to 20thNight
14%5%35%5%35%6%6%7%42%
1598
21st to endNight
17%6%36%5%35%46%6%39%
1800
September1st to 10thNight
16%5%25%5%35%46%7%42%
1800
11th to 20thNight
18%7%25%5%3435%6%42%
1890
21st to endNight
21%7%25%5%3345%8%38%
2020
October1st to 10thNight
21%11%36%5%3345%7%32%
2160
11th to 20thNight
24%14%47%6%35%5%5%5%23%
2160
21st to endNight
22%15%49%6%44445%23%
2456
November1st to 10thNight
17%14%5%7%7%35%45%6%27%
2592
11th to 20thNight
17%15%6%11%9%46%5%46%19%
2660
21st to endNight
20%18%7%9%7%35%5%46%15%
2660
December1st to 10thNight
17%19%8%12%9%45%435%14%
2660
11th to 20thNight
16%17%7%11%10%45%44418%
3526
21st to endNight
19%20%7%15%8%4433413%
5236

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
47%41%6%6%1
1329
11th to 20thDay
44%41%47%3
1302
21st to endDay
43%37%6%10%5%
1730
February1st to 10thDay
44%36%6%9%5%
1620
11th to 20thDay
43%38%7%7%5%
1582
21st to endDay
41%36%6%13%4
1332
March1st to 10thDay
41%37%6%11%5%
1939
11th to 20thDay
38%38%7%13%3
1980
21st to endDay
37%36%6%11%8%1
2178
April1st to 10thDay
39%37%7%11%5%1
2144
11th to 20thDay
34%37%7%15%6%1
2289
21st to endDay
35%37%6%11%9%2
2340
May1st to 10thDay
32%37%8%12%9%2
2448
11th to 20thDay
35%38%6%11%9%1
2482
21st to endDay
30%37%8%14%10%1
2769
June1st to 10thDay
34%38%9%14%5%
2700
11th to 20thDay
28%39%8%16%8%1
2700
21st to endDay
36%39%7%13%5%1
2700
July1st to 10thDay
28%39%10%17%6%
2626
11th to 20thDay
29%41%9%14%7%
2619
21st to endDay
31%41%10%16%2
2647
August1st to 10thDay
35%40%10%12%3
2315
11th to 20thDay
27%39%13%15%5%1
2303
21st to endDay
31%39%8%16%6%1
2538
September1st to 10thDay
31%39%9%17%4
2160
11th to 20thDay
35%38%10%15%2
2066
21st to endDay
37%38%9%13%4
1940
October1st to 10thDay
37%37%8%14%4
1800
11th to 20thDay
46%37%6%9%3
1800
21st to endDay
46%38%6%6%3
1894
November1st to 10thDay
36%42%10%9%4
1486
11th to 20thDay
45%41%5%6%3
1520
21st to endDay
49%40%6%41
1520
December1st to 10thDay
46%40%6%6%2
1516
11th to 20thDay
47%33%7%12%1
1671
21st to endDay
62%25%7%5%1
2431
January1st to 10thNight
46%41%7%5%2
2838
11th to 20thNight
46%40%46%4
2803
21st to endNight
42%38%7%8%5%
2621
February1st to 10thNight
45%37%5%9%5%
2340
11th to 20thNight
44%38%7%8%4
2275
21st to endNight
42%36%6%10%5%
1924
March1st to 10thNight
42%36%5%11%5%
2017
11th to 20thNight
41%37%8%10%4
1980
21st to endNight
35%37%6%11%9%1
2178
April1st to 10thNight
39%36%5%11%8%1
1815
11th to 20thNight
36%36%6%12%9%1
1635
21st to endNight
35%37%6%9%11%2
1620
May1st to 10thNight
34%37%5%12%9%2
1512
11th to 20thNight
30%38%5%15%9%2
1416
21st to endNight
28%38%7%12%13%2
1504
June1st to 10thNight
34%39%8%13%6%1
1260
11th to 20thNight
25%37%8%18%10%1
1260
21st to endNight
31%38%11%13%6%
1260
July1st to 10thNight
27%40%8%17%8%
1225
11th to 20thNight
25%40%9%17%9%
1218
21st to endNight
29%40%10%17%4
1428
August1st to 10thNight
31%38%11%15%5%
1596
11th to 20thNight
24%39%13%17%7%1
1598
21st to endNight
31%38%9%15%7%1
1800
September1st to 10thNight
27%39%10%18%5%1
1800
11th to 20thNight
33%38%10%16%4
1890
21st to endNight
32%39%10%16%4
2020
October1st to 10thNight
37%38%7%11%6%
2160
11th to 20thNight
44%37%7%9%2
2160
21st to endNight
43%38%7%9%4
2456
November1st to 10thNight
36%43%8%10%3
2592
11th to 20thNight
44%41%6%5%3
2660
21st to endNight
46%41%7%5%1
2660
December1st to 10thNight
49%40%45%1
2660
11th to 20thNight
50%34%6%8%1
3525
21st to endNight
62%25%5%7%2
5236

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
23%17%38%16%6%1
180
11th to 20thDay
16%19%33%22%7%2
172
21st to endDay
20%11%35%23%10%2
256
February1st to 10thDay
20%25%32%19%4
240
11th to 20thDay
24%20%32%20%4
240
21st to endDay
26%28%32%13%1
198
March1st to 10thDay
17%17%38%21%7%
388
11th to 20thDay
18%19%33%22%7%1
420
21st to endDay
25%14%35%19%7%1
462
April1st to 10thDay
23%16%31%21%7%1
420
11th to 20thDay
26%17%23%23%7%4
412
21st to endDay
25%18%27%18%10%3
420
May1st to 10thDay
26%10%29%21%11%2
423
11th to 20thDay
23%12%29%21%11%4
447
21st to endDay
18%16%32%23%10%2
529
June1st to 10thDay
19%11%33%27%7%2
630
11th to 20thDay
18%13%28%27%12%3
630
21st to endDay
17%11%27%29%13%3
630
July1st to 10thDay
14%11%31%29%13%2
621
11th to 20thDay
16%10%30%26%16%3
618
21st to endDay
12%11%27%32%15%5%
547
August1st to 10thDay
17%8%28%26%16%5%
446
11th to 20thDay
16%6%22%29%17%10%
439
21st to endDay
18%12%27%23%12%8%
495
September1st to 10thDay
18%10%27%27%14%4
450
11th to 20thDay
20%8%26%32%10%4
450
21st to endDay
25%12%26%20%14%2
450
October1st to 10thDay
27%14%26%20%12%2
450
11th to 20thDay
29%20%32%13%41
450
21st to endDay
33%17%32%15%31
418
November1st to 10thDay
33%21%34%9%3
180
11th to 20thDay
28%17%33%17%41
180
21st to endDay
31%21%34%10%31
180
December1st to 10thDay
24%16%34%18%7%
180
11th to 20thDay
27%16%34%16%5%2
180
21st to endDay
24%18%34%17%6%2
198
January1st to 10thNight
25%13%32%24%6%
950
11th to 20thNight
25%13%30%25%6%
935
21st to endNight
18%9%30%29%12%1
821
February1st to 10thNight
17%14%35%26%7%
720
11th to 20thNight
22%11%38%24%5%
703
21st to endNight
20%15%35%24%6%1
592
March1st to 10thNight
21%14%35%24%5%1
720
11th to 20thNight
20%16%34%23%6%1
720
21st to endNight
21%12%33%27%6%1
792
April1st to 10thNight
26%13%29%27%5%1
720
11th to 20thNight
24%14%27%26%9%
571
21st to endNight
23%11%28%30%6%1
540
May1st to 10thNight
21%8%29%34%7%
432
11th to 20thNight
21%8%31%30%9%1
354
21st to endNight
20%7%30%38%6%
389
June1st to 10thNight
17%9%31%37%6%
360
11th to 20thNight
21%8%26%33%12%
360
21st to endNight
16%5%29%34%14%1
360
July1st to 10thNight
13%434%38%9%1
350
11th to 20thNight
16%6%25%40%13%
348
21st to endNight
12%5%26%41%14%1
394
August1st to 10thNight
14%5%26%36%17%2
532
11th to 20thNight
17%5%22%35%19%2
534
21st to endNight
20%8%26%29%16%2
612
September1st to 10thNight
18%6%30%30%16%1
720
11th to 20thNight
21%8%28%26%15%1
720
21st to endNight
24%8%23%30%13%2
720
October1st to 10thNight
27%8%32%24%9%1
720
11th to 20thNight
32%13%29%19%7%1
720
21st to endNight
33%11%30%21%41
792
November1st to 10thNight
26%13%35%19%6%1
740
11th to 20thNight
26%17%34%18%6%1
760
21st to endNight
33%14%29%19%4
760
December1st to 10thNight
29%14%32%18%7%1
760
11th to 20thNight
27%14%31%22%5%1
950
21st to endNight
28%15%26%24%6%1
1045
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