Mankota
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mankota clear sky chart from 2005-11-05 to 2017-04-28.

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
36%
15320
15%
45573
8%
15280
42%
15280
24%
30183

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
23%
895
12%
2685
5%
895
30%
895
17%
1920
January16th to endNight
23%
960
15%
2721
5%
960
33%
960
18%
1949
February1st to 15thNight
32%
714
11%
2303
6%
711
37%
711
18%
1595
February16th to endNight
32%
632
13%
2022
9%
632
38%
632
17%
1466
March1st to 15thNight
32%
720
14%
2088
7%
720
39%
720
24%
1408
March16th to endNight
30%
710
13%
2054
7%
710
37%
710
18%
1523
April1st to 15thNight
35%
539
16%
1798
10%
539
43%
539
22%
1153
April16th to endNight
35%
534
16%
1565
10%
534
41%
534
22%
1080
May1st to 15thNight
41%
494
16%
1320
7%
494
45%
494
31%
856
May16th to endNight
37%
512
7%
1367
4%
510
39%
510
21%
1006
June1st to 15thNight
46%
330
7%
1155
6%
330
50%
330
25%
691
June16th to endNight
51%
330
6%
1155
6%
330
54%
330
32%
628
July1st to 15thNight
60%
310
9%
1085
9%
310
63%
310
36%
564
July16th to endNight
60%
462
15%
1245
11%
430
64%
430
48%
643
August1st to 15thNight
62%
494
19%
1344
14%
491
67%
491
46%
748
August16th to endNight
60%
525
25%
1627
19%
525
66%
525
43%
856
September1st to 15thNight
57%
495
21%
1650
20%
495
63%
495
33%
931
September16th to endNight
50%
572
26%
1802
20%
572
58%
572
37%
1003
October1st to 15thNight
37%
660
23%
1980
11%
660
47%
660
30%
1190
October16th to endNight
34%
797
20%
2205
9%
797
41%
797
25%
1473
November1st to 15thNight
27%
875
18%
2447
8%
875
35%
875
23%
1662
November16th to endNight
24%
900
15%
2520
5%
900
32%
900
22%
1745
December1st to 15thNight
24%
900
9%
2555
4%
900
30%
900
14%
2003
December16th to endNight
24%
960
13%
2880
4%
960
32%
960
16%
2090

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%8%36%5%35%45%7%37%
46146
Night
8%8%37%5%35%5%5%7%38%
45730
Cloud CoverDay
10%8%36%5%35%45%7%37%
46147
Night
8%8%36%6%35%5%5%7%38%
45732
TransparencyDay
44%5%16%23%9%1
45807
Night
43%5%15%22%10%1
45573
SeeingDay
14%8%28%29%15%3
5479
Night
12%8%33%32%11%1
15331

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
6%11%6%9%7%5%6%5%5%6%27%
1253
16th to endDay
49%48%8%48%7%8%8%26%
1501
February1st to 15thDay
8%11%6%12%9%45%345%27%
1569
16th to endDay
5%13%7%11%8%46%6%6%7%22%
1452
March1st to 15thDay
6%10%49%6%47%6%7%8%28%
1869
16th to endDay
9%12%6%9%7%35%5%5%9%25%
2168
April1st to 15thDay
11%9%46%7%445%6%7%32%
2150
16th to endDay
14%10%37%43445%7%33%
2339
May1st to 15thDay
14%8%35%5%25%45%6%36%
2301
16th to endDay
24%7%35%5%25%45%7%28%
2392
June1st to 15thDay
18%6%35%5%35%5%6%7%31%
2475
16th to endDay
10%424435%5%6%8%43%
2475
July1st to 15thDay
6%425%4245%6%9%47%
2475
16th to endDay
431232345%8%58%
2518
August1st to 15thDay
8%4244245%6%7%49%
2277
16th to endDay
8%313323348%57%
2223
September1st to 15thDay
11%7%15%5%24346%47%
1980
16th to endDay
13%41321335%7%50%
1827
October1st to 15thDay
13%7%35%43345%6%42%
1650
16th to endDay
9%8%36%42445%8%41%
1656
November1st to 15thDay
9%9%345%3345%8%41%
1408
16th to endDay
7%10%49%7%45%45%8%33%
1440
December1st to 15thDay
7%13%5%10%8%5%8%5%47%21%
1404
16th to endDay
5%11%413%9%5%6%45%8%24%
1344
January1st to 15thNight
6%10%49%5%47%5%5%8%31%
2685
16th to endNight
410%49%8%5%6%5%6%8%31%
2721
February1st to 15thNight
5%10%5%9%7%45%6%5%7%32%
2292
16th to endNight
6%12%6%10%8%3436%7%28%
2022
March1st to 15thNight
6%8%46%7%45%5%6%10%34%
2088
16th to endNight
9%10%5%10%7%45%5%48%27%
2051
April1st to 15thNight
9%8%35%6%35%5%6%7%39%
1798
16th to endNight
12%10%36%435%5%5%6%34%
1565
May1st to 15thNight
12%8%24334448%42%
1319
16th to endNight
18%7%26%7%25%35%8%30%
1367
June1st to 15thNight
14%424435%46%9%41%
1155
16th to endNight
7%313426%5%49%50%
1155
July1st to 15thNight
7%32332445%9%52%
1155
16th to endNight
3314325%47%8%57%
1339
August1st to 15thNight
6%413333347%57%
1352
16th to endNight
8%312322336%60%
1627
September1st to 15thNight
10%414434347%50%
1650
16th to endNight
10%42332345%7%53%
1802
October1st to 15thNight
10%7%25%42345%7%46%
1980
16th to endNight
8%9%46%435%5%6%8%37%
2205
November1st to 15thNight
7%10%46%5%345%45%41%
2447
16th to endNight
7%10%47%6%45%5%5%7%34%
2520
December1st to 15thNight
7%12%6%11%8%6%6%5%5%7%22%
2555
16th to endNight
7%11%48%7%46%7%6%7%27%
2880

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
7%11%6%9%7%6%7%5%46%28%
1253
16th to endDay
49%5%8%8%48%6%8%8%26%
1501
February1st to 15thDay
8%11%7%11%10%45%345%27%
1569
16th to endDay
5%13%7%11%8%45%5%6%7%23%
1452
March1st to 15thDay
6%10%5%8%7%47%5%6%7%29%
1869
16th to endDay
9%12%5%10%6%35%5%5%9%25%
2169
April1st to 15thDay
11%9%37%6%445%6%7%32%
2150
16th to endDay
14%11%35%5%3445%7%33%
2339
May1st to 15thDay
14%8%35%6%2445%6%36%
2301
16th to endDay
24%7%25%5%25%45%7%29%
2392
June1st to 15thDay
18%6%25%5%36%46%8%31%
2475
16th to endDay
10%424425%5%6%8%43%
2475
July1st to 15thDay
6%325%4345%7%9%47%
2475
16th to endDay
432332346%8%57%
2518
August1st to 15thDay
8%315%4345%5%7%49%
2277
16th to endDay
8%323323447%56%
2223
September1st to 15thDay
11%6%24423346%47%
1980
16th to endDay
14%41331335%7%50%
1827
October1st to 15thDay
14%7%35%423446%42%
1650
16th to endDay
10%8%36%42445%8%41%
1656
November1st to 15thDay
9%9%35%5%3345%8%41%
1408
16th to endDay
7%10%310%6%36%46%7%33%
1440
December1st to 15thDay
7%13%6%10%8%5%8%5%5%7%22%
1404
16th to endDay
6%11%5%12%10%5%6%45%8%24%
1344
January1st to 15thNight
6%10%5%8%6%46%5%5%7%32%
2685
16th to endNight
49%49%8%46%5%6%8%31%
2721
February1st to 15thNight
6%11%5%9%6%45%6%5%7%32%
2292
16th to endNight
7%12%6%11%7%35%46%5%29%
2022
March1st to 15thNight
6%8%5%6%7%36%46%10%34%
2088
16th to endNight
9%10%5%10%7%45%5%5%7%28%
2054
April1st to 15thNight
9%7%36%5%25%5%6%7%38%
1798
16th to endNight
12%10%36%5%36%5%5%6%34%
1565
May1st to 15thNight
11%8%2443435%7%43%
1319
16th to endNight
18%7%27%6%3445%7%31%
1366
June1st to 15thNight
13%42443446%8%41%
1155
16th to endNight
7%213427%449%50%
1155
July1st to 15thNight
7%31432436%9%52%
1155
16th to endNight
332332445%9%56%
1339
August1st to 15thNight
6%314333347%57%
1352
16th to endNight
8%322312346%60%
1627
September1st to 15thNight
10%414424447%50%
1650
16th to endNight
10%41332245%6%53%
1802
October1st to 15thNight
10%6%3443235%7%46%
1980
16th to endNight
8%9%35%4345%6%8%38%
2205
November1st to 15thNight
8%10%46%5%35%436%41%
2447
16th to endNight
7%10%47%6%35%5%5%7%35%
2520
December1st to 15thNight
7%12%6%11%8%5%6%5%5%6%22%
2555
16th to endNight
7%12%48%8%46%7%5%8%28%
2880

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
56%5%12%18%6%
1253
16th to endDay
50%7%19%15%5%
1501
February1st to 15thDay
59%413%15%7%
1569
16th to endDay
58%416%12%7%
1452
March1st to 15thDay
51%7%21%15%3
1869
16th to endDay
54%7%18%16%3
2169
April1st to 15thDay
48%6%16%20%7%
2150
16th to endDay
48%417%21%6%1
2339
May1st to 15thDay
46%412%28%9%
2301
16th to endDay
53%5%16%18%6%
2396
June1st to 15thDay
49%417%20%6%
2475
16th to endDay
36%5%19%29%8%
2475
July1st to 15thDay
30%419%30%12%1
2316
16th to endDay
24%415%32%19%3
2349
August1st to 15thDay
31%417%27%15%2
2261
16th to endDay
27%313%33%18%3
2223
September1st to 15thDay
38%213%27%15%1
1980
16th to endDay
32%412%31%16%2
1827
October1st to 15thDay
41%5%17%26%9%
1650
16th to endDay
39%5%19%28%6%
1656
November1st to 15thDay
41%418%25%8%1
1408
16th to endDay
48%7%17%18%6%
1440
December1st to 15thDay
60%6%14%16%1
1404
16th to endDay
57%5%19%12%4
1344
January1st to 15thNight
49%7%17%19%5%
2685
16th to endNight
49%6%17%19%5%1
2721
February1st to 15thNight
50%5%18%18%6%1
2303
16th to endNight
54%414%17%8%
2022
March1st to 15thNight
43%5%20%21%7%
2088
16th to endNight
54%5%14%19%5%
2054
April1st to 15thNight
42%6%14%25%10%1
1798
16th to endNight
49%312%21%11%1
1565
May1st to 15thNight
39%411%29%14%
1320
16th to endNight
51%5%13%19%9%
1367
June1st to 15thNight
38%5%18%24%12%
1155
16th to endNight
30%5%22%30%9%
1155
July1st to 15thNight
27%5%15%31%16%2
1085
16th to endNight
21%417%32%19%4
1245
August1st to 15thNight
26%316%35%16%2
1344
16th to endNight
25%311%27%26%6%
1627
September1st to 15thNight
34%311%27%19%4
1650
16th to endNight
28%5%10%29%22%2
1802
October1st to 15thNight
36%416%26%15%
1980
16th to endNight
42%5%15%25%10%1
2205
November1st to 15thNight
44%5%15%22%10%2
2447
16th to endNight
47%5%20%18%8%
2520
December1st to 15thNight
60%5%14%15%3
2555
16th to endNight
51%7%17%17%6%
2880

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
6%6%21%38%20%6%
60
16th to endDay
13%14%27%24%19%1
91
February1st to 15thDay
17%8%43%26%3
90
16th to endDay
14%7%44%22%8%2
81
March1st to 15thDay
14%13%42%20%8%
159
16th to endDay
13%14%40%21%7%1
288
April1st to 15thDay
15%17%32%25%7%
269
16th to endDay
21%11%27%26%11%
320
May1st to 15thDay
18%8%30%26%13%3
393
16th to endDay
25%7%19%25%13%8%
437
June1st to 15thDay
17%8%28%27%15%2
420
16th to endDay
11%9%24%30%20%3
420
July1st to 15thDay
10%220%40%19%6%
400
16th to endDay
5%428%33%24%3
445
August1st to 15thDay
9%323%35%22%5%
385
16th to endDay
11%8%22%30%22%4
268
September1st to 15thDay
14%9%26%37%9%2
255
16th to endDay
18%9%22%31%14%4
184
October1st to 15thDay
31%428%20%10%5%
90
16th to endDay
17%11%25%25%17%3
96
November1st to 15thDay
11%7%42%27%11%
90
16th to endDay
11%15%32%23%15%2
90
December1st to 15thDay
10%7%40%25%10%5%
84
16th to endDay
12%12%46%21%41
64
January1st to 15thNight
12%13%41%24%7%1
900
16th to endNight
10%15%40%24%7%1
960
February1st to 15thNight
9%9%36%29%11%2
719
16th to endNight
12%6%32%30%15%2
632
March1st to 15thNight
9%8%38%31%9%2
720
16th to endNight
14%9%34%31%8%1
710
April1st to 15thNight
12%9%35%33%8%
539
16th to endNight
18%8%29%34%8%
534
May1st to 15thNight
15%6%30%34%11%1
495
16th to endNight
21%8%23%28%17%1
512
June1st to 15thNight
14%6%26%38%13%
330
16th to endNight
9%5%29%37%18%
330
July1st to 15thNight
9%221%49%15%
310
16th to endNight
4424%46%18%1
462
August1st to 15thNight
8%221%45%21%1
494
16th to endNight
9%420%42%21%1
525
September1st to 15thNight
12%222%40%19%2
495
16th to endNight
11%428%39%14%1
572
October1st to 15thNight
15%6%33%30%12%1
660
16th to endNight
14%9%34%33%8%
797
November1st to 15thNight
13%12%38%25%8%1
875
16th to endNight
12%10%43%27%5%
900
December1st to 15thNight
14%9%37%26%11%1
900
16th to endNight
12%10%38%26%10%1
960
Page generated at 2017-04-29 07:44:57. Version ac04

Copyright 2017 A. Danko


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