Salina
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salina clear sky chart from 2005-11-05 to 2017-09-15.

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
45%
15886
25%
46901
15%
15841
54%
15841
37%
26538

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
37%
900
27%
2327
12%
895
47%
895
39%
1382
January16th to endNight
40%
960
30%
2496
12%
960
50%
960
41%
1436
February1st to 15thNight
34%
836
19%
2247
8%
832
41%
832
29%
1475
February16th to endNight
34%
632
28%
1894
10%
632
47%
632
33%
1090
March1st to 15thNight
36%
591
24%
2031
14%
591
47%
591
31%
1113
March16th to endNight
31%
576
20%
2112
14%
576
41%
576
23%
1259
April1st to 15thNight
34%
539
20%
1894
13%
539
47%
539
30%
1039
April16th to endNight
35%
540
22%
1620
16%
540
46%
540
27%
1002
May1st to 15thNight
40%
539
19%
1620
15%
539
48%
539
27%
1024
May16th to endNight
50%
561
18%
1684
14%
561
56%
561
36%
969
June1st to 15thNight
51%
540
19%
1620
11%
540
57%
540
39%
887
June16th to endNight
56%
540
23%
1620
13%
540
63%
540
51%
803
July1st to 15thNight
65%
510
19%
1530
15%
510
68%
510
46%
797
July16th to endNight
71%
564
25%
1594
23%
531
74%
531
43%
850
August1st to 15thNight
72%
539
22%
1610
23%
536
75%
536
41%
873
August16th to endNight
64%
573
28%
1749
27%
573
70%
573
41%
937
September1st to 15thNight
57%
540
23%
1980
22%
540
65%
540
34%
1036
September16th to endNight
59%
492
32%
1815
29%
492
67%
492
39%
881
October1st to 15thNight
47%
573
31%
1893
23%
573
55%
573
32%
1047
October16th to endNight
47%
706
32%
2114
17%
706
58%
706
47%
1055
November1st to 15thNight
49%
875
33%
2275
14%
875
59%
875
51%
1212
November16th to endNight
42%
900
29%
2340
12%
900
53%
900
44%
1335
December1st to 15thNight
37%
900
23%
2340
10%
900
47%
900
36%
1452
December16th to endNight
38%
960
28%
2496
13%
960
48%
960
33%
1584

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
10%424424447%51%
47825
Night
9%424323347%53%
47097
Cloud CoverDay
9%5%24424447%50%
47823
Night
9%42432345%7%53%
47097
TransparencyDay
32%413%27%17%3
47523
Night
30%413%27%20%4
46902
SeeingDay
10%6%26%33%19%3
5883
Night
11%6%31%37%12%
15892

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 15thDay
6%5%23334446%54%
1611
16th to endDay
8%5%3441435%7%51%
1728
February1st to 15thDay
7%8%35%425%447%45%
1624
16th to endDay
6%6%24434347%51%
1580
March1st to 15thDay
10%7%243345%46%49%
1928
16th to endDay
17%7%24323345%45%
2112
April1st to 15thDay
14%6%24424446%47%
2049
16th to endDay
17%5%25%424347%40%
2340
May1st to 15thDay
12%5%244345%5%6%45%
2331
16th to endDay
13%42443445%6%44%
2430
June1st to 15thDay
7%324424437%53%
2340
16th to endDay
5%1124345%6%7%57%
2340
July1st to 15thDay
6%3244445%6%10%47%
2340
16th to endDay
6%3134345%6%9%51%
2466
August1st to 15thDay
7%313425%5%6%9%50%
2340
16th to endDay
7%313434348%55%
2450
September1st to 15thDay
12%424423346%51%
1969
16th to endDay
8%21432345%6%56%
1815
October1st to 15thDay
13%314412246%55%
1724
16th to endDay
9%413222335%62%
1757
November1st to 15thDay
6%312224435%62%
1583
16th to endDay
10%422312335%61%
1620
December1st to 15thDay
11%6%15%424446%48%
1620
16th to endDay
11%8%35%5%22246%45%
1728
January1st to 15thNight
7%5%25%423345%55%
2327
16th to endNight
7%42442335%5%57%
2496
February1st to 15thNight
9%8%35%5%24446%45%
2237
16th to endNight
9%5%25%424345%53%
1894
March1st to 15thNight
8%6%13324447%52%
2031
16th to endNight
16%7%24323347%45%
2112
April1st to 15thNight
11%42442335%7%51%
1894
16th to endNight
15%5%2432335%7%45%
1620
May1st to 15thNight
14%5%25%324447%45%
1619
16th to endNight
10%3132245%6%11%47%
1683
June1st to 15thNight
6%2133245%5%10%54%
1620
16th to endNight
31122235%5%9%60%
1620
July1st to 15thNight
6%21232446%11%54%
1620
16th to endNight
5%213425%46%9%53%
1702
August1st to 15thNight
321443447%9%53%
1620
16th to endNight
7%213324346%58%
1749
September1st to 15thNight
9%41432345%7%53%
1980
16th to endNight
6%3442435%6%59%
1815
October1st to 15thNight
12%413313336%55%
1893
16th to endNight
8%31321233464%
2114
November1st to 15thNight
6%312212347%65%
2275
16th to endNight
10%412212335%60%
2340
December1st to 15thNight
10%6%25%32435%6%49%
2340
16th to endNight
12%7%34323346%48%
2496

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
7%5%13324446%54%
1611
16th to endDay
8%5%34424447%50%
1728
February1st to 15thDay
7%8%35%435%5%47%45%
1624
16th to endDay
6%6%24424448%51%
1580
March1st to 15thDay
10%6%2333445%6%48%
1928
16th to endDay
17%7%24313335%45%
2110
April1st to 15thDay
13%6%24424446%46%
2049
16th to endDay
16%6%25%434347%40%
2340
May1st to 15thDay
12%6%2433445%7%45%
2331
16th to endDay
12%6%2443445%7%43%
2430
June1st to 15thDay
7%324434447%53%
2340
16th to endDay
42133346%5%8%56%
2340
July1st to 15thDay
6%414435%5%6%10%47%
2340
16th to endDay
6%213435%46%9%52%
2466
August1st to 15thDay
7%323435%5%6%9%49%
2340
16th to endDay
7%323424447%54%
2450
September1st to 15thDay
11%5%24423345%51%
1969
16th to endDay
7%22432445%6%55%
1815
October1st to 15thDay
13%31431225%5%55%
1724
16th to endDay
9%41231233462%
1757
November1st to 15thDay
6%312224436%62%
1583
16th to endDay
10%5%1222223461%
1620
December1st to 15thDay
11%6%25%42445%5%47%
1620
16th to endDay
11%8%35%5%23336%45%
1728
January1st to 15thNight
6%5%25%423335%56%
2327
16th to endNight
7%42442335%5%57%
2496
February1st to 15thNight
9%8%35%5%24446%45%
2237
16th to endNight
8%425%424346%53%
1894
March1st to 15thNight
8%6%2442335%7%52%
2031
16th to endNight
17%6%24322347%45%
2112
April1st to 15thNight
10%42432435%7%50%
1894
16th to endNight
15%5%2432345%7%44%
1620
May1st to 15thNight
13%6%24324448%44%
1619
16th to endNight
10%3132235%7%11%46%
1683
June1st to 15thNight
6%21332446%10%53%
1620
16th to endNight
31122235%6%9%60%
1620
July1st to 15thNight
5%2133235%6%10%54%
1620
16th to endNight
5%213325%5%5%10%52%
1702
August1st to 15thNight
321443347%9%52%
1620
16th to endNight
7%313324347%58%
1749
September1st to 15thNight
9%42332346%7%53%
1980
16th to endNight
5%314323347%59%
1815
October1st to 15thNight
12%413323345%54%
1893
16th to endNight
9%313212345%64%
2114
November1st to 15thNight
6%312212346%65%
2275
16th to endNight
10%412222345%60%
2340
December1st to 15thNight
10%6%25%334446%50%
2340
16th to endNight
12%8%24323346%48%
2496

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
30%314%33%15%2
1612
16th to endDay
33%318%28%14%2
1728
February1st to 15thDay
38%5%19%23%9%4
1625
16th to endDay
32%313%28%17%4
1580
March1st to 15thDay
35%411%26%18%3
1928
16th to endDay
41%412%24%13%2
2112
April1st to 15thDay
38%412%26%15%2
2049
16th to endDay
44%311%25%13%1
2340
May1st to 15thDay
37%6%12%25%16%1
2331
16th to endDay
38%6%14%26%11%2
2434
June1st to 15thDay
30%5%14%28%15%4
2340
16th to endDay
23%5%12%31%22%4
2340
July1st to 15thDay
30%5%13%27%19%3
2201
16th to endDay
25%5%12%32%19%4
2311
August1st to 15thDay
29%6%16%27%16%3
2326
16th to endDay
28%412%29%19%6%
2450
September1st to 15thDay
34%412%22%18%7%
1969
16th to endDay
28%410%31%22%3
1815
October1st to 15thDay
31%29%25%25%4
1724
16th to endDay
26%210%30%24%6%
1757
November1st to 15thDay
24%311%26%28%5%
1583
16th to endDay
27%211%33%22%3
1620
December1st to 15thDay
37%416%26%14%
1620
16th to endDay
40%313%26%14%1
1728
January1st to 15thNight
31%314%28%20%2
2327
16th to endNight
28%315%28%20%3
2496
February1st to 15thNight
40%413%25%12%3
2247
16th to endNight
32%312%26%19%6%
1894
March1st to 15thNight
31%411%24%20%6%
2031
16th to endNight
39%411%26%14%3
2112
April1st to 15thNight
32%413%25%21%2
1894
16th to endNight
38%313%22%19%2
1620
May1st to 15thNight
38%6%12%22%17%2
1620
16th to endNight
29%6%23%25%13%2
1685
June1st to 15thNight
25%6%14%32%16%5%
1620
16th to endNight
19%414%32%24%4
1620
July1st to 15thNight
22%415%29%22%4
1530
16th to endNight
25%414%32%19%3
1594
August1st to 15thNight
26%5%18%29%15%5%
1610
16th to endNight
26%411%28%22%7%
1749
September1st to 15thNight
29%413%25%16%10%
1980
16th to endNight
24%410%24%30%5%
1815
October1st to 15thNight
30%5%8%22%25%7%
1893
16th to endNight
23%28%29%29%6%
2114
November1st to 15thNight
20%210%26%29%10%
2275
16th to endNight
26%310%30%23%5%
2340
December1st to 15thNight
34%314%28%17%
2340
16th to endNight
37%313%25%17%2
2496

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
11%15%32%28%11%1
90
16th to endDay
16%6%39%29%7%1
96
February1st to 15thDay
15%13%40%25%5%
90
16th to endDay
7%16%40%24%6%4
81
March1st to 15thDay
7%17%41%26%5%1
90
16th to endDay
19%14%34%26%5%
96
April1st to 15thDay
16%10%35%30%7%
168
16th to endDay
19%12%36%22%7%1
450
May1st to 15thDay
14%9%30%26%15%2
468
16th to endDay
17%8%29%27%15%3
517
June1st to 15thDay
6%428%36%19%4
495
16th to endDay
5%429%37%20%2
495
July1st to 15thDay
7%116%45%25%4
475
16th to endDay
7%19%39%35%6%
515
August1st to 15thDay
7%111%42%33%4
493
16th to endDay
8%317%37%27%5%
490
September1st to 15thDay
4321%40%21%7%
132
16th to endDay
10%315%33%31%6%
90
October1st to 15thDay
6%6%24%31%25%5%
90
16th to endDay
4345%28%16%2
96
November1st to 15thDay
7%424%40%17%5%
90
16th to endDay
23%7%47%14%5%1
90
December1st to 15thDay
10%12%47%20%6%3
90
16th to endDay
16%14%41%22%4
96
January1st to 15thNight
9%10%36%35%8%
900
16th to endNight
9%8%38%37%6%
960
February1st to 15thNight
13%8%37%36%3
839
16th to endNight
10%11%40%32%5%
632
March1st to 15thNight
12%9%38%32%7%
591
16th to endNight
21%9%34%28%5%
576
April1st to 15thNight
12%9%41%31%5%
539
16th to endNight
17%9%32%32%7%
540
May1st to 15thNight
15%6%32%34%10%
540
16th to endNight
10%5%28%38%13%3
563
June1st to 15thNight
8%432%36%18%
540
16th to endNight
4233%42%15%
540
July1st to 15thNight
7%117%50%20%1
510
16th to endNight
7%114%50%25%1
564
August1st to 15thNight
3110%55%28%
539
16th to endNight
8%216%41%27%3
573
September1st to 15thNight
10%224%40%18%3
540
16th to endNight
7%325%41%20%1
492
October1st to 15thNight
15%8%24%35%16%1
573
16th to endNight
10%6%33%36%12%
706
November1st to 15thNight
8%8%32%37%12%
875
16th to endNight
12%8%35%33%10%
900
December1st to 15thNight
14%8%36%36%4
900
16th to endNight
14%8%32%35%8%
960
Page generated at 2017-09-15 23:58:33. Version ac04

Copyright 2017 A. Danko


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