Lincolnshire
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lincolnshire clear sky chart from 2005-11-05 to 2017-08-12.

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
37%
15867
17%
46467
10%
15826
44%
15826
23%
31216

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
19%
900
13%
2506
4%
895
28%
895
17%
1815
January16th to endNight
19%
960
12%
2670
4%
960
26%
960
16%
1991
February1st to 15thNight
21%
794
14%
2205
3%
794
29%
794
19%
1572
February16th to endNight
25%
631
18%
1893
7%
631
34%
631
17%
1332
March1st to 15thNight
27%
720
13%
2160
7%
720
32%
720
17%
1529
March16th to endNight
32%
633
15%
2016
11%
633
38%
633
19%
1389
April1st to 15thNight
31%
539
14%
1797
10%
539
39%
539
18%
1236
April16th to endNight
37%
540
19%
1722
12%
540
46%
540
23%
1146
May1st to 15thNight
37%
540
15%
1596
8%
540
43%
540
21%
1131
May16th to endNight
50%
561
17%
1498
10%
561
54%
561
31%
971
June1st to 15thNight
55%
540
16%
1440
10%
540
58%
540
34%
904
June16th to endNight
52%
540
16%
1440
10%
540
56%
540
31%
945
July1st to 15thNight
66%
510
16%
1360
11%
510
68%
510
39%
818
July16th to endNight
68%
564
21%
1417
16%
531
71%
531
41%
845
August1st to 15thNight
75%
527
22%
1520
21%
524
76%
524
41%
846
August16th to endNight
66%
525
19%
1750
19%
525
70%
525
34%
978
September1st to 15thNight
60%
503
29%
1658
27%
503
66%
503
34%
918
September16th to endNight
55%
657
25%
1815
17%
657
60%
657
35%
1113
October1st to 15thNight
48%
660
24%
1892
18%
660
54%
660
31%
1179
October16th to endNight
28%
704
17%
2249
9%
704
38%
704
20%
1498
November1st to 15thNight
32%
700
23%
2276
15%
700
43%
700
24%
1411
November16th to endNight
25%
759
16%
2379
8%
759
35%
759
18%
1609
December1st to 15thNight
20%
900
12%
2520
4%
900
26%
900
16%
1871
December16th to endNight
14%
960
11%
2688
2%
960
23%
960
12%
2169

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
13%7%36%5%3445%7%36%
47511
Night
14%8%35%424447%39%
46635
Cloud CoverDay
13%7%36%5%3445%7%36%
47520
Night
14%8%35%5%24447%39%
46640
TransparencyDay
46%6%12%21%11%1
47197
Night
44%5%12%22%13%1
46467
SeeingDay
15%6%28%28%14%5%
5840
Night
18%9%28%29%13%1
15872

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
14%13%5%7%5%2445%8%27%
1432
16th to endDay
12%16%6%9%7%34435%25%
1551
February1st to 15thDay
13%14%6%7%6%35%446%29%
1657
16th to endDay
14%11%5%8%5%35%35%6%31%
1580
March1st to 15thDay
14%11%5%8%6%34446%30%
1790
16th to endDay
17%9%47%6%35%45%6%30%
2218
April1st to 15thDay
19%10%46%43435%5%31%
2151
16th to endDay
19%7%35%5%34347%36%
2236
May1st to 15thDay
18%8%36%5%35%35%7%30%
2352
16th to endDay
12%5%25%6%345%5%7%38%
2617
June1st to 15thDay
11%425%5%345%6%7%43%
2520
16th to endDay
10%435%5%35%5%7%10%38%
2520
July1st to 15thDay
8%3145%25%5%6%8%46%
2520
16th to endDay
7%325%6%45%5%6%9%42%
2655
August1st to 15thDay
7%6%25%4345%6%8%43%
2342
16th to endDay
10%425%6%35%5%5%9%41%
2100
September1st to 15thDay
13%3143245%47%48%
1961
16th to endDay
11%5%244345%6%8%42%
1815
October1st to 15thDay
14%7%245%24446%42%
1735
16th to endDay
18%7%35%5%34446%35%
1623
November1st to 15thDay
14%8%35%5%23447%40%
1582
16th to endDay
16%8%46%5%24435%36%
1578
December1st to 15thDay
16%14%46%6%44347%27%
1440
16th to endDay
21%14%5%9%425%445%23%
1536
January1st to 15thNight
16%11%5%6%5%23335%34%
2506
16th to endNight
13%13%7%8%5%24447%28%
2670
February1st to 15thNight
14%12%5%5%423445%35%
2203
16th to endNight
16%11%37%5%24345%34%
1893
March1st to 15thNight
15%9%47%5%34345%35%
2147
16th to endNight
15%9%26%5%345%47%34%
2016
April1st to 15thNight
18%8%35%5%35%45%5%35%
1797
16th to endNight
20%6%35%322345%42%
1722
May1st to 15thNight
17%8%35%5%2446%6%34%
1596
16th to endNight
10%5%35%5%2445%9%43%
1496
June1st to 15thNight
12%4144245%5%6%48%
1440
16th to endNight
8%5%345%36%6%6%10%40%
1440
July1st to 15thNight
6%313435%5%5%9%51%
1440
16th to endNight
6%423325%5%7%11%48%
1513
August1st to 15thNight
42133245%6%9%54%
1529
16th to endNight
9%315%42345%8%51%
1750
September1st to 15thNight
10%414324336%55%
1658
16th to endNight
10%424423447%50%
1815
October1st to 15thNight
13%5%24423446%48%
1892
16th to endNight
19%7%35%423345%40%
2249
November1st to 15thNight
13%8%34424346%45%
2276
16th to endNight
16%8%46%5%24346%37%
2379
December1st to 15thNight
20%10%36%5%2445%6%29%
2520
16th to endNight
23%14%5%8%5%34346%22%
2688

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
14%12%5%6%5%345%5%8%27%
1432
16th to endDay
12%16%6%9%7%34447%23%
1551
February1st to 15thDay
13%13%6%8%6%34445%28%
1657
16th to endDay
13%11%5%8%5%35%45%6%30%
1580
March1st to 15thDay
14%11%48%5%35%446%29%
1800
16th to endDay
17%8%37%6%35%45%6%30%
2217
April1st to 15thDay
18%10%46%5%35%35%5%31%
2151
16th to endDay
18%7%345%34447%36%
2236
May1st to 15thDay
17%8%47%5%35%45%6%31%
2352
16th to endDay
11%6%35%5%35%5%6%7%38%
2617
June1st to 15thDay
10%425%5%3446%7%43%
2520
16th to endDay
8%5%26%5%35%5%7%9%38%
2520
July1st to 15thDay
7%324435%6%6%8%47%
2520
16th to endDay
7%3245%35%5%7%9%43%
2655
August1st to 15thDay
6%5%25%5%35%6%6%8%44%
2342
16th to endDay
9%425%5%45%5%6%9%42%
2100
September1st to 15thDay
13%314434447%48%
1961
16th to endDay
10%5%245%25%5%6%8%42%
1815
October1st to 15thDay
13%7%25%5%3445%5%42%
1735
16th to endDay
17%7%35%5%3445%6%35%
1623
November1st to 15thDay
13%8%35%5%23447%40%
1582
16th to endDay
16%8%46%435%436%35%
1578
December1st to 15thDay
17%12%5%7%6%3445%8%24%
1440
16th to endDay
21%14%6%8%5%2444423%
1536
January1st to 15thNight
16%11%47%5%24346%33%
2506
16th to endNight
13%12%7%8%5%245%47%27%
2670
February1st to 15thNight
14%12%46%424345%35%
2196
16th to endNight
17%9%47%6%24345%34%
1893
March1st to 15thNight
16%8%47%434436%35%
2160
16th to endNight
16%8%36%5%345%5%8%33%
2016
April1st to 15thNight
18%7%35%5%25%446%35%
1797
16th to endNight
20%6%35%31344442%
1722
May1st to 15thNight
17%7%36%5%245%5%6%34%
1595
16th to endNight
10%6%25%43445%8%43%
1496
June1st to 15thNight
12%4135%335%5%7%47%
1440
16th to endNight
8%5%25%446%5%7%10%39%
1440
July1st to 15thNight
6%3144246%6%9%51%
1440
16th to endNight
6%323325%5%7%10%49%
1513
August1st to 15thNight
4213425%5%7%8%54%
1529
16th to endNight
9%415%42335%9%50%
1750
September1st to 15thNight
10%41441325%6%54%
1658
16th to endNight
10%5%15%424447%49%
1815
October1st to 15thNight
13%5%24424347%47%
1892
16th to endNight
18%8%36%422335%40%
2249
November1st to 15thNight
13%7%35%423336%45%
2276
16th to endNight
17%8%35%5%34346%37%
2379
December1st to 15thNight
20%10%36%6%2445%7%27%
2520
16th to endNight
23%15%47%5%34345%21%
2688

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
54%5%14%16%7%
1433
16th to endDay
61%411%15%6%
1551
February1st to 15thDay
56%411%17%8%
1659
16th to endDay
54%5%10%20%7%1
1580
March1st to 15thDay
55%6%12%17%7%1
1800
16th to endDay
53%6%13%19%5%
2218
April1st to 15thDay
54%5%8%19%10%
2151
16th to endDay
47%6%12%17%12%3
2236
May1st to 15thDay
53%5%12%21%6%
2352
16th to endDay
43%7%12%21%14%1
2621
June1st to 15thDay
38%7%11%23%18%1
2520
16th to endDay
39%8%14%20%15%2
2520
July1st to 15thDay
32%8%14%27%15%2
2371
16th to endDay
35%7%16%22%14%3
2488
August1st to 15thDay
35%7%14%27%13%1
2327
16th to endDay
37%7%14%22%16%2
2100
September1st to 15thDay
35%6%11%25%19%2
1961
16th to endDay
37%6%11%29%14%1
1815
October1st to 15thDay
40%5%12%25%13%1
1735
16th to endDay
48%5%12%22%8%1
1623
November1st to 15thDay
43%5%11%23%13%2
1582
16th to endDay
51%5%13%23%6%
1578
December1st to 15thDay
56%5%15%17%5%
1440
16th to endDay
63%5%11%12%6%
1536
January1st to 15thNight
52%413%19%9%
2506
16th to endNight
55%5%14%17%7%
2670
February1st to 15thNight
50%412%20%10%1
2205
16th to endNight
51%411%21%8%2
1893
March1st to 15thNight
50%5%12%17%11%2
2160
16th to endNight
49%5%15%20%8%1
2016
April1st to 15thNight
49%5%9%19%14%1
1797
16th to endNight
45%5%10%20%13%4
1722
May1st to 15thNight
48%6%10%22%11%
1596
16th to endNight
36%7%13%22%17%2
1498
June1st to 15thNight
34%6%11%26%18%2
1440
16th to endNight
36%7%14%22%17%1
1440
July1st to 15thNight
27%8%14%27%18%3
1360
16th to endNight
26%8%17%25%18%4
1417
August1st to 15thNight
24%7%16%29%19%1
1520
16th to endNight
30%5%13%27%17%5%
1750
September1st to 15thNight
30%49%27%25%1
1658
16th to endNight
33%5%10%32%16%1
1815
October1st to 15thNight
35%6%10%26%19%1
1892
16th to endNight
45%5%11%24%10%1
2249
November1st to 15thNight
40%49%25%16%3
2276
16th to endNight
48%414%22%9%
2379
December1st to 15thNight
54%5%12%19%6%
2520
16th to endNight
64%49%14%5%
2688

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
22%11%38%25%2
90
16th to endDay
27%9%27%28%7%1
96
February1st to 15thDay
14%16%51%16%1
90
16th to endDay
16%12%35%22%9%3
81
March1st to 15thDay
31%15%31%17%4
90
16th to endDay
27%8%31%19%10%2
249
April1st to 15thDay
24%11%29%24%9%1
270
16th to endDay
22%11%27%22%12%4
270
May1st to 15thDay
25%8%30%21%10%3
309
16th to endDay
17%7%31%26%12%4
517
June1st to 15thDay
11%5%32%32%14%4
495
16th to endDay
11%435%30%11%5%
495
July1st to 15thDay
7%229%34%17%9%
475
16th to endDay
7%226%35%20%7%
515
August1st to 15thDay
10%116%33%23%13%
384
16th to endDay
10%415%31%25%12%
268
September1st to 15thDay
12%315%33%23%11%
255
16th to endDay
12%421%26%24%10%
254
October1st to 15thDay
14%6%25%31%17%4
175
16th to endDay
30%439%21%4
96
November1st to 15thDay
7%11%24%35%17%3
90
16th to endDay
22%13%43%13%7%
90
December1st to 15thDay
17%20%35%21%41
90
16th to endDay
29%20%44%32
96
January1st to 15thNight
21%15%37%20%4
900
16th to endNight
18%14%38%25%3
960
February1st to 15thNight
21%11%38%23%5%
797
16th to endNight
21%13%32%26%5%
631
March1st to 15thNight
20%11%34%24%9%
720
16th to endNight
19%8%33%26%10%1
633
April1st to 15thNight
22%11%31%27%6%1
539
16th to endNight
24%7%27%30%9%1
540
May1st to 15thNight
20%6%29%31%10%1
540
16th to endNight
12%424%36%21%
563
June1st to 15thNight
13%221%43%18%
540
16th to endNight
10%226%37%20%1
540
July1st to 15thNight
8%118%41%26%3
510
16th to endNight
6%116%43%27%3
564
August1st to 15thNight
5%10%45%32%4
527
16th to endNight
10%215%35%32%4
525
September1st to 15thNight
11%318%31%28%6%
503
16th to endNight
12%5%20%30%26%4
657
October1st to 15thNight
17%6%23%30%20%2
660
16th to endNight
21%15%30%22%8%
704
November1st to 15thNight
18%11%34%24%10%1
700
16th to endNight
21%16%30%23%7%
759
December1st to 15thNight
25%13%34%21%4
900
16th to endNight
30%12%34%20%2
960
Page generated at 2017-08-13 13:16:13. Version ac04

Copyright 2017 A. Danko


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