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 2017-10-31.

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%
16336
16%
47234
9%
16290
43%
16290
25%
31433

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
27%
899
13%
2685
7%
895
34%
895
18%
1919
January16th to endNight
23%
960
14%
2531
5%
960
31%
960
18%
1906
February1st to 15thNight
32%
879
15%
2288
4%
875
39%
875
23%
1579
February16th to endNight
30%
789
15%
2051
5%
789
37%
789
23%
1468
March1st to 15thNight
34%
552
14%
1992
9%
552
41%
552
19%
1331
March16th to endNight
32%
576
16%
2112
12%
576
41%
576
17%
1437
April1st to 15thNight
31%
539
17%
1797
11%
539
43%
539
22%
1179
April16th to endNight
32%
540
16%
1620
11%
540
40%
540
20%
1151
May1st to 15thNight
32%
540
15%
1518
7%
540
38%
540
23%
1045
May16th to endNight
44%
563
14%
1498
5%
561
47%
561
30%
969
June1st to 15thNight
47%
540
12%
1305
5%
540
50%
540
38%
837
June16th to endNight
55%
540
15%
1260
6%
540
57%
540
46%
788
July1st to 15thNight
57%
510
17%
1190
7%
510
60%
510
50%
704
July16th to endNight
63%
564
20%
1419
11%
531
64%
531
49%
774
August1st to 15thNight
64%
539
21%
1610
16%
536
68%
536
41%
874
August16th to endNight
55%
573
24%
1746
21%
573
63%
573
40%
951
September1st to 15thNight
57%
540
22%
1806
20%
540
64%
540
37%
941
September16th to endNight
44%
552
23%
1995
17%
552
54%
552
30%
1085
October1st to 15thNight
38%
720
22%
2160
14%
720
44%
720
28%
1333
October16th to endNight
32%
786
17%
2322
9%
786
39%
786
21%
1600
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
20%
960
11%
2847
3%
960
28%
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%36%
48529
Night
12%8%36%5%3445%7%39%
47395
Cloud CoverDay
13%8%36%5%3445%7%36%
48540
Night
12%8%36%5%3445%7%39%
47399
Cloud CoverDay
13%8%36%5%3445%7%36%
48538
Night
12%8%36%5%3445%7%39%
47399
TransparencyDay
46%414%24%9%
48208
Night
44%413%25%11%1
47234
SeeingDay
17%6%27%28%15%3
6304
Night
16%7%30%32%12%1
16338

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%29%
2112
April1st to 15thDay
15%9%36%5%2445%6%36%
2149
16th to endDay
23%10%36%42335%5%29%
2340
May1st to 15thDay
20%9%47%6%34435%30%
2433
16th to endDay
15%7%245%25%5%6%8%35%
2617
June1st to 15thDay
15%6%35%5%3445%7%35%
2652
16th to endDay
9%425%436%5%6%9%41%
2700
July1st to 15thDay
7%4145%35%5%5%8%48%
2700
16th to endDay
5%3145%35%5%6%9%47%
2648
August1st to 15thDay
8%5%25%6%36%5%7%8%40%
2340
16th to endDay
12%5%2442345%8%46%
2456
September1st to 15thDay
10%4144345%5%8%47%
2154
16th to endDay
15%5%2442345%7%43%
1953
October1st to 15thDay
15%9%25%423347%41%
1800
16th to endDay
21%10%35%422446%35%
1901
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%9%38%5%345%5%6%33%
2112
April1st to 15thNight
16%10%34324445%40%
1797
16th to endNight
21%9%35%433445%35%
1620
May1st to 15thNight
18%8%27%424346%38%
1518
16th to endNight
11%4145%35%5%7%7%43%
1496
June1st to 15thNight
12%5%2331446%8%47%
1305
16th to endNight
8%2442445%9%52%
1260
July1st to 15thNight
43232146%5%8%56%
1260
16th to endNight
431322345%9%58%
1517
August1st to 15thNight
7%3135%225%49%54%
1620
16th to endNight
9%422323348%55%
1746
September1st to 15thNight
9%413422347%55%
1806
16th to endNight
11%5%2441335%6%51%
1995
October1st to 15thNight
13%7%24423345%47%
2160
16th to endNight
19%9%35%423336%37%
2322
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
17%12%46%6%3445%6%28%
2112
April1st to 15thDay
15%9%36%5%2345%6%36%
2149
16th to endDay
23%10%36%42445%5%30%
2340
May1st to 15thDay
21%8%47%6%34445%31%
2433
16th to endDay
15%6%345%35%5%5%8%35%
2617
June1st to 15thDay
16%6%25%5%3446%7%35%
2652
16th to endDay
10%425%436%5%6%9%40%
2700
July1st to 15thDay
7%4146%345%5%8%48%
2700
16th to endDay
6%3135%35%5%6%10%47%
2648
August1st to 15thDay
9%425%5%46%5%7%8%40%
2340
16th to endDay
13%5%1432345%8%46%
2456
September1st to 15thDay
10%4144345%5%9%47%
2154
16th to endDay
14%6%2442445%7%43%
1953
October1st to 15thDay
15%9%25%423347%40%
1800
16th to endDay
21%10%35%322446%35%
1901
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%45%6%33%
2112
April1st to 15thNight
16%10%33424345%41%
1797
16th to endNight
22%8%36%433445%35%
1620
May1st to 15thNight
18%7%36%423346%38%
1517
16th to endNight
11%4145%26%5%6%7%43%
1496
June1st to 15thNight
12%5%2332347%7%47%
1305
16th to endNight
9%21442446%9%51%
1260
July1st to 15thNight
5%3223136%5%8%56%
1260
16th to endNight
5%31322345%9%58%
1517
August1st to 15thNight
7%31342345%8%54%
1620
16th to endNight
10%31222345%7%56%
1746
September1st to 15thNight
9%413323346%56%
1806
16th to endNight
11%5%2432335%6%51%
1995
October1st to 15thNight
13%7%24423345%47%
2160
16th to endNight
19%9%35%333346%37%
2322
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
17%12%37%5%3445%6%29%
2110
April1st to 15thDay
15%10%35%43445%6%36%
2149
16th to endDay
23%9%36%424445%30%
2340
May1st to 15thDay
20%9%47%6%34345%30%
2433
16th to endDay
15%7%25%5%245%5%8%35%
2617
June1st to 15thDay
16%6%25%6%35%45%8%35%
2652
16th to endDay
10%425%435%6%6%9%40%
2700
July1st to 15thDay
7%4145%345%6%8%47%
2700
16th to endDay
6%3145%35%5%7%9%47%
2648
August1st to 15thDay
8%426%5%36%6%7%7%40%
2340
16th to endDay
13%5%244235%5%8%46%
2456
September1st to 15thDay
10%41443445%9%47%
2154
16th to endDay
14%6%2442445%7%43%
1953
October1st to 15thDay
16%9%25%43335%7%40%
1800
16th to endDay
21%9%35%422345%35%
1901
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%9%48%5%245%5%6%33%
2112
April1st to 15thNight
16%11%34323345%40%
1797
16th to endNight
22%8%35%5%24335%35%
1620
May1st to 15thNight
18%6%36%423336%38%
1517
16th to endNight
11%4145%35%6%6%6%44%
1496
June1st to 15thNight
12%5%1432446%7%47%
1305
16th to endNight
9%1144235%5%9%51%
1260
July1st to 15thNight
5%3233235%5%9%55%
1260
16th to endNight
441331335%9%58%
1517
August1st to 15thNight
7%32343345%8%54%
1620
16th to endNight
10%41331345%7%55%
1746
September1st to 15thNight
9%413323347%55%
1806
16th to endNight
10%6%24323346%51%
1995
October1st to 15thNight
13%7%24423246%47%
2160
16th to endNight
19%9%45%433336%37%
2322
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%23%3
2112
April1st to 15thDay
47%411%21%12%1
2149
16th to endDay
55%313%15%10%1
2340
May1st to 15thDay
55%311%21%6%
2433
16th to endDay
45%5%12%25%10%
2621
June1st to 15thDay
46%415%24%7%
2652
16th to endDay
38%5%15%29%9%1
2700
July1st to 15thDay
32%5%15%29%15%1
2541
16th to endDay
30%5%17%29%13%2
2483
August1st to 15thDay
38%5%13%28%10%2
2326
16th to endDay
35%416%26%15%1
2456
September1st to 15thDay
33%416%34%10%
2154
16th to endDay
40%314%34%6%
1953
October1st to 15thDay
43%313%26%11%1
1800
16th to endDay
51%313%22%8%
1901
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%23%6%
2112
April1st to 15thNight
45%410%24%14%1
1797
16th to endNight
52%39%19%12%2
1620
May1st to 15thNight
47%311%24%11%
1518
16th to endNight
37%6%13%24%16%1
1498
June1st to 15thNight
33%5%18%29%12%1
1305
16th to endNight
28%418%29%16%3
1260
July1st to 15thNight
24%416%35%16%2
1190
16th to endNight
22%416%34%17%3
1419
August1st to 15thNight
27%315%34%14%4
1610
16th to endNight
27%415%29%19%2
1746
September1st to 15thNight
28%315%36%15%
1806
16th to endNight
34%215%33%13%
1995
October1st to 15thNight
39%310%31%14%1
2160
16th to endNight
49%312%23%11%
2322
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
29%9%20%26%12%2
96
April1st to 15thDay
18%9%30%26%13%1
268
16th to endDay
30%8%25%22%11%1
450
May1st to 15thDay
25%10%28%23%8%2
468
16th to endDay
20%7%27%29%9%5%
517
June1st to 15thDay
15%7%28%30%15%1
495
16th to endDay
12%8%31%27%15%5%
495
July1st to 15thDay
9%425%29%23%8%
475
16th to endDay
8%5%24%33%22%5%
515
August1st to 15thDay
11%320%33%28%3
493
16th to endDay
14%423%28%22%6%
496
September1st to 15thDay
9%326%35%20%4
309
16th to endDay
16%439%25%8%5%
135
October1st to 15thDay
17%8%36%18%12%5%
135
16th to endDay
25%9%28%23%12%
144
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%30%29%10%1
576
April1st to 15thNight
21%7%33%28%8%
539
16th to endNight
25%5%28%30%9%
540
May1st to 15thNight
22%8%28%31%6%1
540
16th to endNight
13%430%35%14%1
563
June1st to 15thNight
15%227%41%11%1
540
16th to endNight
10%226%44%16%
540
July1st to 15thNight
7%225%41%21%1
510
16th to endNight
7%121%46%20%1
564
August1st to 15thNight
8%317%42%25%2
539
16th to endNight
10%225%35%23%2
573
September1st to 15thNight
10%321%40%21%2
540
16th to endNight
15%5%31%28%15%3
552
October1st to 15thNight
17%8%30%29%12%1
720
16th to endNight
25%6%28%32%6%
786
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 2017-11-01 16:23:38. Version ac04

Copyright 2017 A. Danko


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