Little Elk River
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Elk River clear sky chart from 2005-11-05 to 2017-03-19.

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%
15630
16%
45159
9%
15584
43%
15584
24%
30194

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
28%
899
13%
2685
7%
895
35%
895
18%
1919
January16th to endNight
23%
960
14%
2531
5%
960
30%
960
18%
1906
February1st to 15thNight
32%
879
15%
2288
4%
875
39%
875
23%
1579
February16th to endNight
31%
789
15%
2051
5%
789
38%
789
23%
1468
March1st to 15thNight
34%
552
14%
1992
9%
552
41%
552
19%
1331
March16th to endNight
32%
540
14%
1980
10%
540
41%
540
17%
1352
April1st to 15thNight
30%
494
18%
1647
11%
494
43%
494
23%
1077
April16th to endNight
32%
495
16%
1485
10%
495
40%
495
20%
1053
May1st to 15thNight
31%
495
15%
1392
7%
495
37%
495
22%
973
May16th to endNight
44%
515
13%
1370
5%
513
47%
513
31%
884
June1st to 15thNight
45%
495
13%
1196
5%
495
48%
495
36%
783
June16th to endNight
55%
495
14%
1155
5%
495
57%
495
46%
716
July1st to 15thNight
56%
465
18%
1085
8%
465
59%
465
49%
650
July16th to endNight
63%
522
18%
1306
9%
489
64%
489
49%
712
August1st to 15thNight
63%
494
22%
1475
17%
491
68%
491
42%
791
August16th to endNight
55%
525
23%
1600
21%
525
62%
525
40%
877
September1st to 15thNight
56%
495
23%
1655
20%
495
63%
495
35%
880
September16th to endNight
45%
506
22%
1829
17%
506
54%
506
31%
980
October1st to 15thNight
38%
660
23%
1980
14%
660
45%
660
28%
1225
October16th to endNight
33%
720
15%
2128
8%
720
38%
720
21%
1476
November1st to 15thNight
34%
875
19%
2442
9%
875
42%
875
24%
1635
November16th to endNight
30%
900
16%
2520
9%
900
36%
900
21%
1768
December1st to 15thNight
26%
900
10%
2520
4%
900
31%
900
16%
1892
December16th to endNight
21%
960
11%
2847
3%
960
29%
960
11%
2267

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%8%36%5%3445%7%35%
45672
Night
12%8%36%5%3445%7%39%
45320
Cloud CoverDay
13%8%36%5%3445%7%36%
45683
Night
12%8%36%5%3445%7%39%
45324
Cloud CoverDay
13%8%36%5%3445%7%35%
45681
Night
12%8%46%5%3445%7%38%
45324
TransparencyDay
47%414%23%9%
45351
Night
45%413%24%11%1
45159
SeeingDay
17%7%27%28%15%4
5331
Night
16%7%30%32%11%1
15632

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
8%13%5%9%7%36%5%5%7%27%
1253
16th to endDay
9%14%5%9%8%45%5%5%7%23%
1689
February1st to 15thDay
6%11%5%9%7%46%5%46%31%
1575
16th to endDay
10%11%5%8%8%45%6%5%6%27%
1428
March1st to 15thDay
14%9%5%8%5%34446%33%
1960
16th to endDay
17%12%47%5%3435%6%28%
1974
April1st to 15thDay
15%9%26%5%2345%6%37%
1969
16th to endDay
23%10%36%42345%6%29%
2145
May1st to 15thDay
21%9%48%6%34435%29%
2229
16th to endDay
14%6%245%25%5%6%8%36%
2393
June1st to 15thDay
17%7%35%6%35%46%8%32%
2431
16th to endDay
9%425%435%5%6%9%41%
2475
July1st to 15thDay
7%415%5%35%5%6%8%46%
2475
16th to endDay
5%3145%35%6%7%10%46%
2453
August1st to 15thDay
8%425%6%36%5%6%8%40%
2145
16th to endDay
12%5%2442445%8%46%
2250
September1st to 15thDay
10%4244345%5%8%46%
1975
16th to endDay
15%5%2442345%7%44%
1790
October1st to 15thDay
14%9%25%323346%41%
1650
16th to endDay
22%10%35%422346%34%
1744
November1st to 15thDay
13%8%46%5%2345%5%39%
1415
16th to endDay
15%11%5%8%7%3435%6%29%
1440
December1st to 15thDay
12%14%5%10%6%35%45%6%24%
1440
16th to endDay
14%15%7%12%7%24246%20%
1374
January1st to 15thNight
9%9%5%9%7%46%5%5%6%30%
2685
16th to endNight
10%12%6%10%5%45%5%6%8%25%
2531
February1st to 15thNight
7%9%5%8%5%35%45%8%35%
2285
16th to endNight
7%11%49%6%45%45%6%34%
2051
March1st to 15thNight
12%9%47%5%34446%36%
1980
16th to endNight
15%8%38%6%345%46%33%
1980
April1st to 15thNight
17%10%33324445%40%
1647
16th to endNight
21%9%35%43334435%
1485
May1st to 15thNight
19%8%27%324346%37%
1392
16th to endNight
10%4145%35%5%7%7%44%
1368
June1st to 15thNight
13%5%233245%6%7%44%
1196
16th to endNight
8%2442345%9%52%
1155
July1st to 15thNight
43233146%5%8%56%
1155
16th to endNight
431322345%9%58%
1404
August1st to 15thNight
6%3134235%5%9%55%
1485
16th to endNight
9%42232335%8%55%
1600
September1st to 15thNight
9%414423347%54%
1655
16th to endNight
11%42431335%7%51%
1829
October1st to 15thNight
12%7%25%423345%47%
1980
16th to endNight
20%9%45%423336%36%
2128
November1st to 15thNight
11%7%35%5%35%45%7%38%
2442
16th to endNight
13%9%47%5%2445%7%35%
2520
December1st to 15thNight
12%12%6%9%6%35%5%46%27%
2520
16th to endNight
15%15%6%9%8%34446%20%
2847

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%13%6%9%7%35%5%6%7%27%
1253
16th to endDay
9%13%5%9%8%445%5%7%23%
1689
February1st to 15thDay
6%12%5%8%7%46%5%46%32%
1575
16th to endDay
10%11%49%7%46%6%5%6%27%
1428
March1st to 15thDay
14%9%5%7%5%25%446%33%
1971
16th to endDay
18%12%46%6%3345%6%28%
1974
April1st to 15thDay
15%9%36%5%2345%5%37%
1969
16th to endDay
23%10%36%42445%5%29%
2145
May1st to 15thDay
22%9%47%6%3434429%
2229
16th to endDay
14%6%345%35%5%6%8%36%
2393
June1st to 15thDay
17%7%26%6%35%46%7%32%
2431
16th to endDay
10%425%436%5%5%9%41%
2475
July1st to 15thDay
7%4146%345%5%8%47%
2475
16th to endDay
6%3135%35%5%6%10%46%
2453
August1st to 15thDay
8%425%5%46%5%6%8%40%
2145
16th to endDay
12%5%2442345%8%46%
2250
September1st to 15thDay
10%4144245%5%8%46%
1975
16th to endDay
15%5%2442345%7%44%
1790
October1st to 15thDay
15%9%25%323347%41%
1650
16th to endDay
22%10%35%322346%34%
1744
November1st to 15thDay
13%8%46%5%2345%5%40%
1415
16th to endDay
15%11%48%7%33446%28%
1440
December1st to 15thDay
12%14%5%10%6%36%446%24%
1440
16th to endDay
15%15%7%12%8%24236%21%
1374
January1st to 15thNight
8%9%5%9%7%5%6%5%5%6%30%
2685
16th to endNight
9%12%6%10%6%35%5%6%8%25%
2531
February1st to 15thNight
7%9%6%8%5%3445%7%36%
2278
16th to endNight
8%10%49%6%4445%6%35%
2051
March1st to 15thNight
12%9%46%5%35%346%36%
1992
16th to endNight
15%9%38%6%25%446%33%
1980
April1st to 15thNight
17%11%23324345%41%
1647
16th to endNight
22%8%36%43344435%
1485
May1st to 15thNight
20%7%36%424336%37%
1391
16th to endNight
11%4145%26%5%6%7%44%
1368
June1st to 15thNight
13%5%2332347%7%45%
1196
16th to endNight
9%21432346%10%52%
1155
July1st to 15thNight
5%3223136%5%8%55%
1155
16th to endNight
5%31322335%9%58%
1404
August1st to 15thNight
6%31342345%8%55%
1485
16th to endNight
10%31222345%8%55%
1600
September1st to 15thNight
9%424423346%55%
1655
16th to endNight
11%5%2432335%6%51%
1829
October1st to 15thNight
13%8%24433346%47%
1980
16th to endNight
20%9%35%323345%37%
2128
November1st to 15thNight
11%7%345%35%5%5%7%39%
2442
16th to endNight
13%9%46%5%3345%7%35%
2520
December1st to 15thNight
12%12%6%9%6%35%5%46%27%
2520
16th to endNight
15%16%6%9%8%34446%20%
2847

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
8%13%5%8%8%35%46%6%27%
1253
16th to endDay
9%14%410%8%45%6%5%7%23%
1689
February1st to 15thDay
6%11%5%9%7%36%5%46%32%
1575
16th to endDay
11%10%5%8%8%46%5%5%6%27%
1428
March1st to 15thDay
14%9%47%6%25%446%33%
1971
16th to endDay
18%12%37%6%3445%6%28%
1972
April1st to 15thDay
15%10%35%43445%6%37%
1969
16th to endDay
23%9%36%424445%30%
2145
May1st to 15thDay
21%9%48%6%3434429%
2229
16th to endDay
14%6%25%5%245%6%9%36%
2393
June1st to 15thDay
17%7%26%6%35%45%8%31%
2431
16th to endDay
10%424435%6%6%9%41%
2475
July1st to 15thDay
7%4145%345%6%8%46%
2475
16th to endDay
6%3145%35%5%7%9%47%
2453
August1st to 15thDay
8%426%6%45%6%7%7%41%
2145
16th to endDay
12%5%244235%5%8%46%
2250
September1st to 15thDay
10%42443445%8%46%
1975
16th to endDay
15%5%2442445%7%44%
1790
October1st to 15thDay
15%9%25%33335%7%40%
1650
16th to endDay
22%10%35%422345%34%
1744
November1st to 15thDay
13%9%46%5%2345%5%39%
1415
16th to endDay
15%11%48%7%3445%6%28%
1440
December1st to 15thDay
12%14%5%10%6%45%45%5%24%
1440
16th to endDay
14%15%7%13%7%34235%21%
1374
January1st to 15thNight
8%9%5%9%8%46%46%6%29%
2685
16th to endNight
10%12%6%10%6%35%5%6%8%25%
2531
February1st to 15thNight
7%9%6%8%5%25%45%7%36%
2278
16th to endNight
8%10%49%7%3445%6%34%
2051
March1st to 15thNight
12%9%46%5%34446%37%
1992
16th to endNight
15%8%48%5%245%5%6%33%
1980
April1st to 15thNight
16%11%23323346%40%
1647
16th to endNight
22%8%35%5%34335%35%
1485
May1st to 15thNight
20%6%36%423336%37%
1391
16th to endNight
10%4145%35%5%6%7%45%
1368
June1st to 15thNight
13%5%1432446%7%45%
1196
16th to endNight
9%11442345%9%52%
1155
July1st to 15thNight
5%3233236%5%8%55%
1155
16th to endNight
441331336%9%57%
1404
August1st to 15thNight
6%31332345%8%55%
1485
16th to endNight
9%41331345%8%55%
1600
September1st to 15thNight
9%413333347%54%
1655
16th to endNight
10%5%23323347%52%
1829
October1st to 15thNight
13%7%24423346%46%
1980
16th to endNight
20%9%45%333336%36%
2128
November1st to 15thNight
11%7%45%5%35%5%5%6%38%
2442
16th to endNight
13%9%47%6%2345%7%34%
2520
December1st to 15thNight
12%12%5%10%6%35%5%46%26%
2520
16th to endNight
15%16%6%9%8%34446%20%
2847

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%412%19%8%
1254
16th to endDay
58%413%18%5%
1689
February1st to 15thDay
52%313%21%6%1
1576
16th to endDay
56%411%21%6%
1428
March1st to 15thDay
52%314%20%8%
1971
16th to endDay
56%312%22%3
1974
April1st to 15thDay
46%410%22%13%1
1969
16th to endDay
55%313%15%10%1
2145
May1st to 15thDay
58%310%20%6%
2229
16th to endDay
43%5%12%26%10%
2397
June1st to 15thDay
49%415%24%5%
2431
16th to endDay
37%5%16%28%10%1
2475
July1st to 15thDay
33%5%15%28%15%1
2316
16th to endDay
31%5%18%29%12%2
2288
August1st to 15thDay
38%5%13%28%11%2
2131
16th to endDay
35%415%26%16%1
2250
September1st to 15thDay
33%416%33%10%
1975
16th to endDay
40%315%34%6%
1790
October1st to 15thDay
43%314%26%10%1
1650
16th to endDay
52%313%22%8%
1744
November1st to 15thDay
45%413%22%12%
1415
16th to endDay
56%414%15%7%1
1440
December1st to 15thDay
61%313%16%4
1440
16th to endDay
66%310%12%6%
1374
January1st to 15thNight
52%411%21%9%
2685
16th to endNight
55%412%20%6%
2531
February1st to 15thNight
46%315%23%10%
2288
16th to endNight
49%312%22%11%
2051
March1st to 15thNight
48%416%20%9%
1992
16th to endNight
51%414%22%6%
1980
April1st to 15thNight
45%49%25%14%1
1647
16th to endNight
52%39%19%12%2
1485
May1st to 15thNight
49%311%23%10%
1392
16th to endNight
37%6%12%24%17%1
1370
June1st to 15thNight
35%5%18%29%9%
1196
16th to endNight
28%418%29%15%3
1155
July1st to 15thNight
25%416%34%16%2
1085
16th to endNight
22%417%34%17%3
1306
August1st to 15thNight
26%415%34%15%4
1475
16th to endNight
27%414%28%21%3
1600
September1st to 15thNight
29%314%36%14%
1655
16th to endNight
33%215%34%13%
1829
October1st to 15thNight
39%310%31%13%1
1980
16th to endNight
50%313%22%10%
2128
November1st to 15thNight
44%312%26%11%1
2442
16th to endNight
48%416%20%8%1
2520
December1st to 15thNight
57%313%19%5%
2520
16th to endNight
65%310%14%5%
2847

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%8%28%26%12%1
90
16th to endDay
18%6%31%28%13%2
96
February1st to 15thDay
14%18%44%18%3
90
16th to endDay
25%6%39%23%31
81
March1st to 15thDay
23%6%27%31%10%1
90
16th to endDay
36%12%15%20%13%1
58
April1st to 15thDay
18%12%29%24%13%1
208
16th to endDay
30%8%24%23%12%1
375
May1st to 15thDay
28%12%26%21%8%2
393
16th to endDay
18%8%26%29%11%6%
437
June1st to 15thDay
17%7%29%28%14%1
420
16th to endDay
11%8%30%26%16%5%
420
July1st to 15thDay
11%425%29%20%9%
400
16th to endDay
8%6%26%32%20%5%
445
August1st to 15thDay
10%322%33%26%3
418
16th to endDay
13%425%29%21%6%
418
September1st to 15thDay
10%424%38%18%4
250
16th to endDay
18%5%32%25%10%7%
90
October1st to 15thDay
10%11%34%22%16%5%
90
16th to endDay
27%7%29%20%15%
96
November1st to 15thDay
12%5%27%40%12%2
90
16th to endDay
41%424%21%8%
90
December1st to 15thDay
23%5%31%31%8%
90
16th to endDay
29%10%31%20%5%3
96
January1st to 15thNight
13%11%33%29%10%2
900
16th to endNight
16%10%36%28%7%
960
February1st to 15thNight
11%9%34%32%11%
880
16th to endNight
13%10%33%28%11%2
789
March1st to 15thNight
17%7%32%31%9%1
552
16th to endNight
19%7%31%30%9%1
540
April1st to 15thNight
22%7%34%27%7%
494
16th to endNight
26%5%27%31%8%
495
May1st to 15thNight
23%9%29%28%6%1
495
16th to endNight
12%5%30%35%14%1
515
June1st to 15thNight
16%327%41%10%
495
16th to endNight
10%226%44%16%
495
July1st to 15thNight
7%226%40%20%1
465
16th to endNight
7%122%45%20%1
522
August1st to 15thNight
7%318%43%23%2
494
16th to endNight
10%225%35%22%2
525
September1st to 15thNight
11%321%40%20%2
495
16th to endNight
15%5%30%28%16%3
506
October1st to 15thNight
18%8%29%29%12%
660
16th to endNight
26%5%26%33%6%
720
November1st to 15thNight
15%10%32%31%9%
875
16th to endNight
18%11%32%27%9%
900
December1st to 15thNight
19%9%32%31%6%
900
16th to endNight
23%9%29%28%8%1
960
Page generated at 2017-03-20 07:18:35. Version ac04

Copyright 2017 A. Danko


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