Ottawa (KS)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ottawa (KS) clear sky chart from 2005-11-05 to

2017-09-12
.

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
43%
15858
23%
47030
14%
15811
51%
15811
32%
28115

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
33%
900
23%
2327
9%
895
44%
895
34%
1448
January16th to endNight
29%
960
26%
2496
10%
960
40%
960
34%
1551
February1st to 15thNight
25%
880
17%
2288
6%
876
32%
876
24%
1581
February16th to endNight
29%
654
25%
1916
10%
654
39%
654
28%
1167
March1st to 15thNight
33%
540
22%
1980
13%
540
46%
540
25%
1168
March16th to endNight
27%
576
16%
2112
10%
576
36%
576
19%
1362
April1st to 15thNight
34%
539
21%
1872
12%
539
49%
539
27%
1074
April16th to endNight
32%
540
21%
1690
13%
540
45%
540
24%
1091
May1st to 15thNight
39%
540
20%
1620
16%
540
46%
540
28%
1039
May16th to endNight
48%
563
18%
1685
15%
561
53%
561
31%
1026
June1st to 15thNight
58%
540
19%
1515
12%
540
63%
540
39%
875
June16th to endNight
62%
540
23%
1565
16%
540
66%
540
50%
810
July1st to 15thNight
69%
510
17%
1530
15%
510
71%
510
40%
848
July16th to endNight
73%
564
24%
1594
24%
531
75%
531
43%
861
August1st to 15thNight
77%
539
23%
1610
27%
536
78%
536
41%
875
August16th to endNight
70%
573
27%
1800
30%
573
74%
573
39%
982
September1st to 15thNight
62%
530
24%
1844
26%
530
65%
530
30%
1057
September16th to endNight
62%
492
29%
1815
27%
492
70%
492
35%
937
October1st to 15thNight
47%
639
28%
1959
21%
639
52%
639
34%
1146
October16th to endNight
40%
704
29%
2112
15%
704
51%
704
38%
1148
November1st to 15thNight
42%
775
30%
2175
14%
775
54%
775
38%
1221
November16th to endNight
33%
900
25%
2440
10%
900
45%
900
34%
1468
December1st to 15thNight
30%
900
20%
2520
8%
900
40%
900
27%
1633
December16th to endNight
30%
960
23%
2565
10%
960
40%
960
25%
1747

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%5%14316%3346%40%
47606
Night
9%413316%3345%44%
47225
Cloud CoverDay
12%6%25%42445%7%45%
47604
Night
10%5%24423446%50%
47225
TransparencyDay
37%6%13%25%15%2
47304
Night
33%5%12%26%18%3
47030
SeeingDay
13%6%25%30%19%4
5877
Night
13%8%30%33%13%1
15858

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
8%415%320%234440%
1611
16th to endDay
9%5%25%318%333438%
1728
February1st to 15thDay
9%8%35%419%323436%
1575
16th to endDay
11%6%35%317%3335%36%
1566
March1st to 15thDay
9%7%25%419%344432%
1980
16th to endDay
16%8%24318%223432%
2112
April1st to 15thDay
13%6%25%318%3335%35%
2076
16th to endDay
16%6%25%419%3335%27%
2268
May1st to 15thDay
13%6%24419%3336%33%
2331
16th to endDay
13%5%14320%3446%30%
2430
June1st to 15thDay
7%313419%345%7%38%
2436
16th to endDay
2212319%345%8%46%
2386
July1st to 15thDay
7%313412%345%7%45%
2340
16th to endDay
5%213319%345%7%41%
2466
August1st to 15thDay
7%414311%445%8%45%
2340
16th to endDay
6%314410%445%7%46%
2402
September1st to 15thDay
12%5%14310%2336%45%
2032
16th to endDay
7%313311%245%7%47%
1815
October1st to 15thDay
12%6%14311%323447%
1659
16th to endDay
9%414310%3335%50%
1760
November1st to 15thDay
6%413215%333450%
1681
16th to endDay
12%5%13218%112445%
1517
December1st to 15thDay
13%8%24418%2225%33%
1440
16th to endDay
11%7%25%318%233335%
1655
January1st to 15thNight
6%5%13319%3335%42%
2327
16th to endNight
7%5%24318%3335%42%
2496
February1st to 15thNight
8%8%35%418%334336%
2278
16th to endNight
10%425%417%243441%
1916
March1st to 15thNight
9%6%15%318%233440%
1980
16th to endNight
14%5%15%318%2245%34%
2112
April1st to 15thNight
8%5%24318%323442%
1872
16th to endNight
14%5%24319%333434%
1690
May1st to 15thNight
12%323318%334440%
1619
16th to endNight
10%313419%3348%38%
1683
June1st to 15thNight
4213319%345%7%45%
1515
16th to endNight
2112218%335%8%51%
1565
July1st to 15thNight
5%312312%345%6%51%
1620
16th to endNight
3113418%245%7%45%
1702
August1st to 15thNight
422410%35%6%8%50%
1620
16th to endNight
5%314310%3325%56%
1800
September1st to 15thNight
10%423311%3345%47%
1844
16th to endNight
6%313310%3446%50%
1815
October1st to 15thNight
13%313311%2236%49%
1959
16th to endNight
6%313310%223456%
2112
November1st to 15thNight
6%312316%234450%
2175
16th to endNight
12%412218%123447%
2440
December1st to 15thNight
13%6%14318%2345%36%
2520
16th to endNight
12%7%24319%233436%
2565

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
10%5%25%433445%49%
1611
16th to endDay
11%6%37%423447%45%
1728
February1st to 15thDay
11%9%5%5%434245%42%
1575
16th to endDay
13%7%35%424447%43%
1566
March1st to 15thDay
11%8%35%5%345%5%6%38%
1980
16th to endDay
20%10%35%423335%36%
2110
April1st to 15thDay
16%7%25%424346%43%
2076
16th to endDay
19%7%36%6%33445%36%
2268
May1st to 15thDay
17%7%25%5%34437%37%
2331
16th to endDay
15%6%35%5%34448%36%
2430
June1st to 15thDay
9%324435%5%7%10%43%
2436
16th to endDay
5%2124345%6%10%52%
2386
July1st to 15thDay
8%324435%46%9%46%
2340
16th to endDay
6%3134345%7%9%49%
2466
August1st to 15thDay
7%3144345%5%10%48%
2340
16th to endDay
9%3144345%5%9%48%
2402
September1st to 15thDay
13%5%25%423347%48%
2032
16th to endDay
7%4244245%6%7%51%
1815
October1st to 15thDay
13%6%14323335%51%
1659
16th to endDay
11%5%14323335%54%
1760
November1st to 15thDay
9%4132135%45%56%
1681
16th to endDay
15%6%23312236%52%
1517
December1st to 15thDay
15%9%34423236%42%
1440
16th to endDay
14%7%46%424445%40%
1655
January1st to 15thNight
8%6%24424445%51%
2327
16th to endNight
8%6%25%423445%51%
2496
February1st to 15thNight
11%10%36%5%24346%41%
2278
16th to endNight
11%5%35%423445%49%
1916
March1st to 15thNight
11%7%25%42345%6%47%
1980
16th to endNight
18%6%25%423446%39%
2112
April1st to 15thNight
10%5%25%423437%50%
1872
16th to endNight
18%5%25%42335%5%43%
1690
May1st to 15thNight
14%5%25%424446%45%
1619
16th to endNight
11%32343445%9%47%
1683
June1st to 15thNight
42144345%6%9%52%
1515
16th to endNight
411222445%11%59%
1565
July1st to 15thNight
6%2133345%6%9%53%
1620
16th to endNight
5%21442446%10%54%
1702
August1st to 15thNight
43124245%5%11%53%
1620
16th to endNight
6%424413336%58%
1800
September1st to 15thNight
11%423424446%50%
1844
16th to endNight
6%42432445%6%55%
1815
October1st to 15thNight
14%313323346%53%
1959
16th to endNight
9%413323235%60%
2112
November1st to 15thNight
8%423323346%58%
2175
16th to endNight
15%5%13212235%54%
2440
December1st to 15thNight
15%7%25%32435%6%44%
2520
16th to endNight
15%8%35%423346%41%
2565

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
36%5%13%25%17%1
1612
16th to endDay
39%415%25%12%1
1728
February1st to 15thDay
44%5%13%25%8%2
1576
16th to endDay
41%413%24%13%2
1566
March1st to 15thDay
44%6%11%22%12%2
1980
16th to endDay
50%411%21%9%1
2112
April1st to 15thDay
43%411%23%16%
2076
16th to endDay
49%5%12%20%11%
2268
May1st to 15thDay
47%6%10%21%12%
2331
16th to endDay
44%8%15%19%10%1
2434
June1st to 15thDay
33%8%14%25%15%1
2436
16th to endDay
25%8%15%29%19%1
2386
July1st to 15thDay
32%7%16%28%12%2
2201
16th to endDay
26%8%16%31%15%2
2311
August1st to 15thDay
31%7%15%26%16%2
2326
16th to endDay
32%7%12%25%16%6%
2402
September1st to 15thDay
36%5%11%23%17%5%
2032
16th to endDay
29%5%13%27%20%2
1815
October1st to 15thDay
35%49%25%20%5%
1659
16th to endDay
32%412%26%20%4
1760
November1st to 15thDay
28%5%11%27%21%6%
1681
16th to endDay
35%39%29%20%1
1517
December1st to 15thDay
43%413%27%10%
1440
16th to endDay
44%5%13%21%12%2
1655
January1st to 15thNight
34%314%26%18%2
2327
16th to endNight
33%5%13%28%17%2
2496
February1st to 15thNight
43%5%12%23%12%1
2288
16th to endNight
36%410%25%18%3
1916
March1st to 15thNight
36%6%11%22%18%4
1980
16th to endNight
45%5%12%22%12%2
2112
April1st to 15thNight
35%411%25%21%2
1872
16th to endNight
41%5%10%24%16%1
1690
May1st to 15thNight
39%6%12%23%17%1
1620
16th to endNight
33%7%18%25%13%1
1685
June1st to 15thNight
26%7%16%30%15%2
1515
16th to endNight
19%5%14%33%22%3
1565
July1st to 15thNight
26%6%15%31%16%3
1530
16th to endNight
23%6%13%32%20%2
1594
August1st to 15thNight
23%8%16%31%17%4
1610
16th to endNight
28%49%26%23%6%
1800
September1st to 15thNight
33%6%10%23%18%7%
1844
16th to endNight
27%5%11%27%25%3
1815
October1st to 15thNight
32%5%8%22%23%6%
1959
16th to endNight
27%49%29%24%4
2112
November1st to 15thNight
28%411%24%24%7%
2175
16th to endNight
33%39%30%19%3
2440
December1st to 15thNight
40%5%13%27%12%
2520
16th to endNight
43%5%11%21%13%3
2565

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
25%14%36%15%7%
90
16th to endDay
16%12%44%20%32
96
February1st to 15thDay
7%22%43%20%6%
90
16th to endDay
12%24%41%13%6%1
81
March1st to 15thDay
17%18%44%17%1
90
16th to endDay
23%18%35%15%6%
96
April1st to 15thDay
17%12%34%24%9%
195
16th to endDay
23%11%36%19%7%1
378
May1st to 15thDay
19%10%32%24%10%1
468
16th to endDay
19%8%30%23%13%3
517
June1st to 15thDay
9%325%34%20%5%
495
16th to endDay
5%431%34%20%2
495
July1st to 15thDay
11%117%37%25%7%
475
16th to endDay
6%11%37%37%6%
515
August1st to 15thDay
8%9%36%35%8%
493
16th to endDay
9%214%33%31%8%
442
September1st to 15thDay
9%113%40%28%7%
219
16th to endDay
10%120%40%20%8%
90
October1st to 15thDay
5%11%25%34%12%11%
90
16th to endDay
9%5%46%27%8%3
96
November1st to 15thDay
13%6%20%36%14%8%
90
16th to endDay
37%12%26%20%21
90
December1st to 15thDay
17%13%42%17%5%3
90
16th to endDay
22%19%30%23%3
96
January1st to 15thNight
10%13%38%29%6%
900
16th to endNight
11%12%41%29%5%
960
February1st to 15thNight
16%12%39%28%3
880
16th to endNight
15%12%38%28%4
654
March1st to 15thNight
13%10%38%30%6%
540
16th to endNight
20%11%36%25%5%
576
April1st to 15thNight
14%12%36%30%6%
539
16th to endNight
20%10%33%26%8%
540
May1st to 15thNight
16%5%33%31%11%
540
16th to endNight
13%432%32%15%1
563
June1st to 15thNight
6%424%44%19%1
540
16th to endNight
4128%44%19%
540
July1st to 15thNight
8%15%48%24%1
510
16th to endNight
5%10%48%32%2
564
August1st to 15thNight
7%7%45%37%2
539
16th to endNight
7%113%37%35%3
573
September1st to 15thNight
11%117%41%24%2
530
16th to endNight
8%319%38%26%4
492
October1st to 15thNight
17%328%29%18%2
639
16th to endNight
12%8%37%29%12%
704
November1st to 15thNight
9%11%31%32%12%1
775
16th to endNight
18%11%33%30%6%
900
December1st to 15thNight
20%10%34%28%5%
900
16th to endNight
20%9%34%30%5%
960
Page generated at 2017-09-13 06:39:21. Version ac04

Copyright 2017 A. Danko


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