Lincoln City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lincoln City clear sky chart from 2005-11-05 to 2017-10-06.

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
39%
14784
10%
46821
10%
14750
41%
14750
14%
35484

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
26%
720
8%
2506
7%
716
29%
716
8%
2067
January16th to endNight
32%
768
10%
2529
9%
768
34%
768
11%
1998
February1st to 15thNight
27%
697
5%
2288
5%
697
29%
697
7%
1943
February16th to endNight
26%
632
8%
2036
5%
632
30%
632
8%
1684
March1st to 15thNight
25%
720
4%
1993
3%
720
25%
720
8%
1740
March16th to endNight
23%
768
4%
2112
4%
768
23%
768
6%
1895
April1st to 15thNight
27%
719
6%
1802
3%
719
28%
719
9%
1568
April16th to endNight
39%
561
8%
1641
6%
561
39%
561
12%
1291
May1st to 15thNight
40%
440
10%
1520
10%
440
43%
440
15%
1088
May16th to endNight
39%
375
6%
1496
9%
374
40%
374
10%
1136
June1st to 15thNight
43%
360
6%
1431
10%
360
44%
360
13%
1033
June16th to endNight
51%
360
10%
1260
12%
360
52%
360
19%
865
July1st to 15thNight
68%
340
15%
1264
22%
340
68%
340
33%
666
July16th to endNight
68%
427
18%
1463
25%
401
70%
401
37%
729
August1st to 15thNight
67%
538
16%
1611
15%
535
67%
535
36%
906
August16th to endNight
65%
627
22%
1773
18%
627
65%
627
36%
1043
September1st to 15thNight
71%
720
24%
1800
15%
720
72%
720
48%
1041
September16th to endNight
56%
716
22%
1994
18%
716
57%
716
28%
1325
October1st to 15thNight
50%
684
14%
2052
14%
684
52%
684
23%
1407
October16th to endNight
36%
704
10%
2112
10%
704
38%
704
13%
1637
November1st to 15thNight
29%
700
7%
2410
7%
700
30%
700
8%
2048
November16th to endNight
32%
720
5%
2520
6%
720
33%
720
10%
2030
December1st to 15thNight
30%
720
8%
2520
7%
720
33%
720
9%
2017
December16th to endNight
22%
768
6%
2688
5%
768
23%
768
5%
2327

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
25%9%36%5%2445%7%26%
48385
Night
28%10%36%5%24345%25%
46990
Cloud CoverDay
27%9%36%423346%27%
48385
Night
29%9%36%423345%26%
46994
TransparencyDay
57%6%11%14%7%2
48058
Night
58%5%10%13%8%3
46822
SeeingDay
30%7%20%27%12%2
6078
Night
33%5%12%23%21%3
14792

By Month

Percentage Cloud Cover NW (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
42%10%35%41223319%
1432
16th to endDay
32%9%35%5%22335%25%
1692
February1st to 15thDay
36%11%37%6%3432315%
1576
16th to endDay
35%14%45%42333418%
1436
March1st to 15thDay
43%12%46%42333312%
1965
16th to endDay
36%12%5%7%6%2423414%
2112
April1st to 15thDay
30%11%5%8%6%23346%16%
2146
16th to endDay
27%9%37%6%2446%6%20%
2316
May1st to 15thDay
22%9%46%5%2445%6%28%
2430
16th to endDay
24%9%36%5%36%6%6%8%20%
2615
June1st to 15thDay
25%9%45%5%25%5%6%7%23%
2525
16th to endDay
18%9%36%5%3445%8%30%
2700
July1st to 15thDay
11%6%243235%6%11%42%
2616
16th to endDay
10%7%35%42437%10%39%
2604
August1st to 15thDay
9%8%46%5%45%6%7%10%30%
2340
16th to endDay
9%6%25%4246%7%10%40%
2429
September1st to 15thDay
7%6%1442446%11%46%
2160
16th to endDay
20%5%25%42445%7%36%
1964
October1st to 15thDay
23%9%45%324335%32%
1705
16th to endDay
30%8%36%5%23347%24%
1760
November1st to 15thDay
37%9%47%5%23346%15%
1446
16th to endDay
34%9%46%6%35%33319%
1440
December1st to 15thDay
33%10%35%5%3444419%
1440
16th to endDay
42%11%35%5%2422215%
1536
January1st to 15thNight
38%9%36%42333418%
2506
16th to endNight
33%9%36%5%23335%23%
2529
February1st to 15thNight
32%11%48%5%2433416%
2276
16th to endNight
31%13%5%7%6%3222321%
2036
March1st to 15thNight
43%9%36%42322415%
1993
16th to endNight
39%13%47%6%2323411%
2108
April1st to 15thNight
31%15%48%5%2333316%
1802
16th to endNight
25%10%46%5%35%5%5%8%20%
1641
May1st to 15thNight
22%10%37%5%33345%28%
1520
16th to endNight
29%11%46%5%35%45%7%17%
1496
June1st to 15thNight
24%10%47%6%24446%23%
1431
16th to endNight
19%11%47%424447%29%
1260
July1st to 15thNight
10%8%35%5%34347%43%
1340
16th to endNight
9%9%36%435%5%48%40%
1563
August1st to 15thNight
9%10%36%42446%9%37%
1620
16th to endNight
12%7%36%423349%42%
1773
September1st to 15thNight
7%5%25%333447%54%
1800
16th to endNight
16%7%26%324447%38%
1994
October1st to 15thNight
22%6%25%314346%38%
2052
16th to endNight
29%8%36%5%24445%26%
2112
November1st to 15thNight
38%9%35%6%34445%15%
2410
16th to endNight
34%9%36%5%2333322%
2520
December1st to 15thNight
32%9%36%5%2344322%
2520
16th to endNight
42%11%36%5%2322315%
2688

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 15thDay
43%11%4431212320%
1432
16th to endDay
34%9%36%31423424%
1692
February1st to 15thDay
38%11%5%6%6%2323314%
1576
16th to endDay
38%12%5%6%32233218%
1436
March1st to 15thDay
45%12%47%42223311%
1965
16th to endDay
40%13%5%7%43324311%
2112
April1st to 15thDay
34%12%48%5%3335%5%13%
2146
16th to endDay
30%11%47%5%34445%18%
2316
May1st to 15thDay
24%10%5%6%32435%6%27%
2430
16th to endDay
27%8%47%5%35%45%7%18%
2615
June1st to 15thDay
28%9%37%42445%5%23%
2525
16th to endDay
20%7%36%5%25%448%30%
2700
July1st to 15thDay
11%5%3332336%9%47%
2616
16th to endDay
10%5%25%42445%10%44%
2604
August1st to 15thDay
9%7%25%5%445%6%9%38%
2340
16th to endDay
10%6%35%42345%9%45%
2429
September1st to 15thDay
8%41332445%10%50%
2160
16th to endDay
21%6%25%5%23447%36%
1964
October1st to 15thDay
26%7%36%434235%32%
1705
16th to endDay
32%8%35%423346%23%
1760
November1st to 15thDay
40%8%46%43343415%
1446
16th to endDay
35%10%36%5%3433219%
1440
December1st to 15thDay
36%11%36%5%2333320%
1440
16th to endDay
44%11%45%42322215%
1536
January1st to 15thNight
40%10%36%42333418%
2506
16th to endNight
34%10%35%5%2233423%
2529
February1st to 15thNight
35%11%47%5%2433416%
2276
16th to endNight
33%13%37%5%2323321%
2036
March1st to 15thNight
43%11%36%32323315%
1993
16th to endNight
41%12%47%5%2234411%
2112
April1st to 15thNight
34%14%48%5%2423415%
1802
16th to endNight
27%10%45%5%2445%7%20%
1641
May1st to 15thNight
23%10%45%42345%6%28%
1520
16th to endNight
30%9%36%5%3445%7%19%
1496
June1st to 15thNight
24%9%36%6%2435%6%25%
1431
16th to endNight
20%8%45%6%2445%7%30%
1260
July1st to 15thNight
9%5%34325%5%47%46%
1340
16th to endNight
7%5%26%5%245%48%45%
1563
August1st to 15thNight
7%6%26%4245%7%11%40%
1620
16th to endNight
10%7%2432345%7%46%
1773
September1st to 15thNight
7%41342235%6%57%
1800
16th to endNight
16%7%25%42345%6%41%
1994
October1st to 15thNight
23%6%15%42345%5%38%
2052
16th to endNight
30%9%36%5%2434426%
2112
November1st to 15thNight
39%8%36%5%33345%16%
2410
16th to endNight
37%8%36%42433322%
2520
December1st to 15thNight
34%9%36%42434422%
2520
16th to endNight
44%12%35%42322315%
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
71%36%6%8%3
1432
16th to endDay
64%5%6%10%7%6%
1692
February1st to 15thDay
77%5%5%6%4
1576
16th to endDay
73%5%6%6%7%
1436
March1st to 15thDay
80%45%5%3
1965
16th to endDay
79%6%5%6%2
2112
April1st to 15thDay
75%6%8%8%1
2146
16th to endDay
69%7%7%8%4
2316
May1st to 15thDay
57%6%13%14%8%
2430
16th to endDay
64%8%13%11%1
2619
June1st to 15thDay
61%9%12%12%4
2525
16th to endDay
51%8%17%15%5%2
2700
July1st to 15thDay
30%6%18%24%15%5%
2464
16th to endDay
28%5%17%29%16%3
2441
August1st to 15thDay
33%8%20%23%10%2
2324
16th to endDay
33%6%16%26%15%3
2429
September1st to 15thDay
27%5%16%23%16%10%
2160
16th to endDay
47%7%12%19%10%2
1964
October1st to 15thDay
55%49%13%13%2
1705
16th to endDay
63%5%9%12%8%1
1760
November1st to 15thDay
73%6%6%10%2
1446
16th to endDay
71%5%47%6%3
1440
December1st to 15thDay
70%47%8%7%
1440
16th to endDay
76%45%7%41
1536
January1st to 15thNight
71%36%6%8%3
2506
16th to endNight
65%46%7%7%7%
2529
February1st to 15thNight
71%6%7%8%31
2288
16th to endNight
69%5%8%8%6%1
2036
March1st to 15thNight
75%45%9%4
1993
16th to endNight
78%5%7%5%3
2112
April1st to 15thNight
73%49%8%4
1802
16th to endNight
60%8%12%11%5%1
1641
May1st to 15thNight
54%5%13%16%7%2
1521
16th to endNight
59%8%14%11%41
1496
June1st to 15thNight
54%8%16%15%4
1431
16th to endNight
46%9%19%17%43
1260
July1st to 15thNight
28%6%17%22%17%6%
1264
16th to endNight
25%5%16%28%17%7%
1463
August1st to 15thNight
28%6%21%27%9%6%
1611
16th to endNight
31%6%14%26%15%5%
1773
September1st to 15thNight
24%5%15%22%21%11%
1800
16th to endNight
42%5%12%19%13%6%
1994
October1st to 15thNight
46%5%10%16%15%5%
2052
16th to endNight
61%5%8%13%10%1
2112
November1st to 15thNight
71%6%8%9%3
2410
16th to endNight
67%5%7%6%7%6%
2520
December1st to 15thNight
65%5%7%11%8%
2520
16th to endNight
76%45%7%41
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
46%116%21%13%
60
16th to endDay
44%9%13%20%12%
220
February1st to 15thDay
50%5%16%22%4
236
16th to endDay
47%10%19%18%4
214
March1st to 15thDay
60%12%14%10%2
270
16th to endDay
51%11%20%10%4
288
April1st to 15thDay
40%11%20%17%9%1
269
16th to endDay
38%12%24%15%6%2
270
May1st to 15thDay
34%13%22%21%6%1
288
16th to endDay
26%8%21%26%14%3
330
June1st to 15thDay
32%425%25%11%1
320
16th to endDay
17%429%36%10%1
495
July1st to 15thDay
12%320%45%16%1
398
16th to endDay
10%420%43%18%2
327
August1st to 15thDay
13%117%42%18%6%
315
16th to endDay
11%214%40%26%4
332
September1st to 15thDay
14%421%30%22%5%
315
16th to endDay
22%5%23%29%17%
315
October1st to 15thDay
30%8%20%25%12%2
278
16th to endDay
44%5%19%19%9%1
272
November1st to 15thDay
41%12%26%17%2
82
16th to endDay
38%128%13%18%
60
December1st to 15thDay
68%10%15%6%
60
16th to endDay
40%10%20%20%7%
64
January1st to 15thNight
45%8%14%18%13%
720
16th to endNight
38%5%15%20%17%2
768
February1st to 15thNight
40%6%15%20%15%1
704
16th to endNight
40%10%15%18%13%1
632
March1st to 15thNight
51%7%10%17%10%2
720
16th to endNight
48%7%11%16%13%2
768
April1st to 15thNight
40%8%13%20%14%2
719
16th to endNight
31%6%13%26%18%3
561
May1st to 15thNight
26%5%17%26%21%2
441
16th to endNight
34%410%21%25%3
375
June1st to 15thNight
26%214%26%26%1
360
16th to endNight
21%312%30%30%2
360
July1st to 15thNight
12%8%37%37%4
340
16th to endNight
8%19%36%38%5%
427
August1st to 15thNight
10%5%30%43%9%
538
16th to endNight
14%110%27%37%8%
627
September1st to 15thNight
9%10%25%41%11%
720
16th to endNight
20%211%30%29%5%
716
October1st to 15thNight
27%314%25%23%6%
684
16th to endNight
35%414%20%19%5%
704
November1st to 15thNight
43%7%14%22%11%
700
16th to endNight
41%7%13%19%15%2
720
December1st to 15thNight
39%7%16%23%12%1
720
16th to endNight
51%9%12%15%9%
768
Page generated at 2017-10-07 11:07:55. Version ac04

Copyright 2017 A. Danko


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