Stearns Scout Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stearns Scout Camp clear sky chart from 2005-11-05 to 2017-09-19.

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
38%
16149
16%
46546
9%
16102
44%
16102
25%
31006

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
31%
900
13%
2515
7%
895
37%
895
20%
1814
January16th to endNight
26%
960
12%
2523
5%
960
32%
960
18%
1885
February1st to 15thNight
32%
879
13%
2288
4%
875
38%
875
23%
1609
February16th to endNight
31%
780
15%
2042
5%
780
39%
780
24%
1433
March1st to 15thNight
33%
552
14%
1992
10%
552
39%
552
20%
1307
March16th to endNight
34%
576
15%
2112
13%
576
42%
576
17%
1432
April1st to 15thNight
32%
539
17%
1803
12%
539
42%
539
22%
1182
April16th to endNight
31%
540
17%
1632
12%
540
40%
540
18%
1180
May1st to 15thNight
32%
540
14%
1518
6%
540
39%
540
22%
1060
May16th to endNight
42%
563
15%
1498
5%
561
47%
561
30%
971
June1st to 15thNight
49%
540
13%
1385
4%
540
53%
540
36%
885
June16th to endNight
57%
540
16%
1260
7%
540
60%
540
45%
788
July1st to 15thNight
60%
510
16%
1223
7%
510
62%
510
46%
739
July16th to endNight
66%
564
20%
1459
10%
531
68%
531
47%
804
August1st to 15thNight
66%
539
21%
1610
19%
536
69%
536
37%
921
August16th to endNight
60%
573
22%
1764
19%
573
67%
573
38%
981
September1st to 15thNight
57%
540
23%
1800
22%
540
65%
540
39%
939
September16th to endNight
43%
526
21%
1870
15%
526
54%
526
29%
1068
October1st to 15thNight
39%
660
24%
1980
14%
660
46%
660
31%
1182
October16th to endNight
34%
704
15%
2112
8%
704
40%
704
21%
1425
November1st to 15thNight
34%
864
20%
2432
9%
864
43%
864
26%
1591
November16th to endNight
30%
900
16%
2520
9%
900
35%
900
21%
1767
December1st to 15thNight
26%
900
10%
2520
4%
900
31%
900
16%
1903
December16th to endNight
22%
960
12%
2688
3%
960
29%
960
12%
2140

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%7%36%5%3445%7%37%
48221
Night
12%7%35%5%2445%6%41%
46711
Cloud CoverDay
13%7%36%5%3445%7%37%
48232
Night
12%7%35%5%24447%41%
46715
Cloud CoverDay
13%7%36%5%3445%7%37%
48230
Night
12%7%35%5%2445%7%41%
46715
TransparencyDay
45%6%14%22%9%
47905
Night
42%6%14%23%11%1
46546
SeeingDay
16%7%28%28%16%3
6152
Night
15%7%31%32%12%1
16150

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%12%6%8%7%37%5%5%6%27%
1387
16th to endDay
9%12%410%6%47%6%6%7%24%
1698
February1st to 15thDay
8%11%49%5%36%5%5%6%32%
1575
16th to endDay
9%10%410%7%36%45%6%30%
1430
March1st to 15thDay
13%9%5%8%6%24347%33%
1967
16th to endDay
18%9%46%5%2445%6%31%
2112
April1st to 15thDay
16%8%36%424447%37%
2144
16th to endDay
24%10%36%5%33336%29%
2328
May1st to 15thDay
19%7%46%6%3445%5%33%
2432
16th to endDay
15%6%25%5%35%5%6%8%36%
2617
June1st to 15thDay
13%6%36%5%245%6%7%37%
2571
16th to endDay
9%425%5%3446%10%42%
2700
July1st to 15thDay
7%313425%46%9%50%
2662
16th to endDay
6%3134245%6%10%48%
2607
August1st to 15thDay
9%425%6%35%6%6%7%42%
2340
16th to endDay
13%42442445%7%48%
2438
September1st to 15thDay
9%31443446%7%49%
2160
16th to endDay
14%6%244345%5%7%42%
1821
October1st to 15thDay
16%6%245%23346%44%
1650
16th to endDay
19%9%35%5%23347%36%
1760
November1st to 15thDay
13%9%36%5%24347%38%
1423
16th to endDay
15%9%36%6%25%36%8%32%
1440
December1st to 15thDay
13%13%5%8%8%45%45%5%26%
1440
16th to endDay
17%16%7%11%5%23335%22%
1519
January1st to 15thNight
8%8%5%7%7%36%5%5%6%33%
2515
16th to endNight
11%13%5%7%6%345%6%7%29%
2523
February1st to 15thNight
8%10%5%7%435%45%6%38%
2285
16th to endNight
9%8%37%6%35%5%5%7%36%
2042
March1st to 15thNight
12%9%36%5%25%446%40%
1980
16th to endNight
15%9%46%5%2445%7%35%
2112
April1st to 15thNight
15%9%35%423445%40%
1803
16th to endNight
22%11%35%423335%34%
1632
May1st to 15thNight
18%6%35%5%24345%39%
1518
16th to endNight
12%425%5%25%45%8%43%
1496
June1st to 15thNight
13%41342445%8%48%
1385
16th to endNight
8%31232446%7%55%
1260
July1st to 15thNight
42144335%5%8%56%
1296
16th to endNight
42133235%5%9%58%
1558
August1st to 15thNight
7%32342345%8%53%
1620
16th to endNight
8%31342335%5%57%
1764
September1st to 15thNight
8%3133225%5%7%56%
1800
16th to endNight
11%5%245%23346%51%
1870
October1st to 15thNight
13%5%24423337%50%
1980
16th to endNight
19%8%35%313335%40%
2112
November1st to 15thNight
12%7%36%423446%43%
2432
16th to endNight
13%9%46%5%2445%6%37%
2520
December1st to 15thNight
12%10%5%8%7%44446%31%
2520
16th to endNight
17%14%5%8%6%34445%23%
2688

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%12%6%8%7%37%5%5%6%27%
1387
16th to endDay
9%13%49%7%47%6%6%7%24%
1698
February1st to 15thDay
8%11%5%9%6%46%5%5%5%33%
1575
16th to endDay
9%10%5%10%7%36%45%6%30%
1430
March1st to 15thDay
13%9%5%8%6%24446%34%
1978
16th to endDay
18%9%46%5%2445%7%31%
2112
April1st to 15thDay
16%8%47%424447%37%
2144
16th to endDay
24%10%35%5%24335%29%
2328
May1st to 15thDay
19%7%37%6%3435%5%32%
2432
16th to endDay
15%6%25%5%35%5%5%8%36%
2617
June1st to 15thDay
13%6%36%5%245%6%7%36%
2571
16th to endDay
9%425%5%35%5%6%10%42%
2700
July1st to 15thDay
7%31343446%9%50%
2662
16th to endDay
5%323425%47%10%49%
2607
August1st to 15thDay
9%425%6%35%6%6%7%41%
2340
16th to endDay
13%42342435%7%48%
2438
September1st to 15thDay
9%31443445%8%49%
2160
16th to endDay
15%5%25%33445%6%42%
1821
October1st to 15thDay
16%6%245%23346%43%
1650
16th to endDay
19%9%35%423447%35%
1760
November1st to 15thDay
12%10%46%433347%38%
1423
16th to endDay
15%9%36%5%26%35%8%32%
1440
December1st to 15thDay
13%12%5%8%8%35%45%5%26%
1440
16th to endDay
17%16%7%11%5%33245%22%
1519
January1st to 15thNight
8%9%5%7%7%35%5%5%7%33%
2515
16th to endNight
11%13%5%8%6%335%6%7%29%
2523
February1st to 15thNight
8%10%5%7%4345%5%6%38%
2278
16th to endNight
8%8%47%6%35%5%5%7%36%
2042
March1st to 15thNight
12%9%35%5%24446%40%
1992
16th to endNight
15%9%46%42345%6%35%
2112
April1st to 15thNight
15%9%35%333446%40%
1803
16th to endNight
22%11%34423435%34%
1632
May1st to 15thNight
18%6%35%5%23345%40%
1517
16th to endNight
11%425%5%2445%9%43%
1496
June1st to 15thNight
13%412424449%47%
1385
16th to endNight
8%2123245%6%7%55%
1260
July1st to 15thNight
422343345%9%56%
1296
16th to endNight
421323345%8%58%
1558
August1st to 15thNight
8%32332445%8%53%
1620
16th to endNight
9%313423346%57%
1764
September1st to 15thNight
7%31332345%7%56%
1800
16th to endNight
11%5%24423346%51%
1870
October1st to 15thNight
13%5%24412346%50%
1980
16th to endNight
20%8%25%323346%40%
2112
November1st to 15thNight
12%8%36%423447%43%
2432
16th to endNight
13%9%46%5%2445%6%37%
2520
December1st to 15thNight
12%10%5%8%7%44446%31%
2520
16th to endNight
17%14%5%8%7%34445%23%
2688

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%12%6%8%6%47%5%5%6%27%
1387
16th to endDay
9%12%5%10%6%46%7%5%7%24%
1698
February1st to 15thDay
8%10%5%8%6%45%5%5%6%32%
1575
16th to endDay
9%10%410%7%36%45%6%29%
1430
March1st to 15thDay
13%9%5%8%6%2435%5%34%
1978
16th to endDay
17%10%46%5%3445%6%32%
2110
April1st to 15thDay
16%8%47%424446%37%
2144
16th to endDay
24%10%45%5%34335%29%
2328
May1st to 15thDay
19%7%47%6%3445%5%32%
2432
16th to endDay
14%6%25%5%35%46%7%36%
2617
June1st to 15thDay
14%6%36%5%245%5%8%36%
2571
16th to endDay
9%415%5%35%5%6%9%42%
2700
July1st to 15thDay
7%313435%46%9%50%
2662
16th to endDay
5%323435%46%10%48%
2607
August1st to 15thDay
9%425%6%36%6%6%7%42%
2340
16th to endDay
13%41442335%8%48%
2438
September1st to 15thDay
9%314435%45%8%49%
2160
16th to endDay
15%6%25%43445%7%42%
1821
October1st to 15thDay
16%6%25%5%23346%43%
1650
16th to endDay
19%9%35%5%23446%36%
1760
November1st to 15thDay
12%10%46%43345%6%38%
1423
16th to endDay
15%9%36%5%25%45%8%32%
1440
December1st to 15thDay
14%12%5%7%9%45%45%426%
1440
16th to endDay
16%16%7%11%6%33235%22%
1519
January1st to 15thNight
9%8%6%7%7%35%5%5%7%32%
2515
16th to endNight
10%13%5%8%6%2446%7%29%
2523
February1st to 15thNight
8%10%5%7%43445%6%38%
2278
16th to endNight
9%8%48%6%35%5%6%7%36%
2042
March1st to 15thNight
12%9%35%5%24446%39%
1992
16th to endNight
15%9%46%42435%7%35%
2112
April1st to 15thNight
15%9%35%423445%40%
1803
16th to endNight
22%11%44413435%34%
1632
May1st to 15thNight
19%6%26%434346%39%
1517
16th to endNight
11%426%5%2446%8%42%
1496
June1st to 15thNight
13%413334449%47%
1385
16th to endNight
8%21232446%8%54%
1260
July1st to 15thNight
432343445%8%56%
1296
16th to endNight
421333345%8%58%
1558
August1st to 15thNight
7%41432445%8%53%
1620
16th to endNight
9%313323346%56%
1764
September1st to 15thNight
7%31332345%7%56%
1800
16th to endNight
11%5%24423346%51%
1870
October1st to 15thNight
13%5%24323347%50%
1980
16th to endNight
20%8%34423346%40%
2112
November1st to 15thNight
12%7%35%423447%43%
2432
16th to endNight
13%9%46%5%2445%6%37%
2520
December1st to 15thNight
12%10%5%7%7%45%445%31%
2520
16th to endNight
17%14%5%9%7%34445%23%
2688

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
55%7%11%18%6%
1388
16th to endDay
56%7%15%16%3
1698
February1st to 15thDay
51%7%14%19%6%1
1576
16th to endDay
53%7%13%19%6%
1430
March1st to 15thDay
51%6%14%19%6%
1978
16th to endDay
53%7%12%23%2
2112
April1st to 15thDay
47%5%12%21%11%1
2144
16th to endDay
57%412%15%9%1
2328
May1st to 15thDay
53%5%12%20%7%
2432
16th to endDay
44%8%14%21%10%1
2621
June1st to 15thDay
43%8%14%24%7%
2571
16th to endDay
35%7%17%27%10%1
2700
July1st to 15thDay
28%8%16%28%16%1
2506
16th to endDay
29%9%17%26%15%1
2444
August1st to 15thDay
37%8%15%26%8%2
2326
16th to endDay
33%6%16%28%13%1
2438
September1st to 15thDay
32%6%17%33%10%
2160
16th to endDay
40%7%13%30%7%
1821
October1st to 15thDay
41%414%25%12%1
1650
16th to endDay
48%5%15%21%8%
1760
November1st to 15thDay
46%413%20%13%1
1423
16th to endDay
49%7%17%15%8%1
1440
December1st to 15thDay
59%7%12%15%5%
1440
16th to endDay
65%410%13%5%
1519
January1st to 15thNight
48%7%13%20%8%
2515
16th to endNight
52%6%15%18%5%
2523
February1st to 15thNight
46%5%16%21%9%
2288
16th to endNight
44%6%15%21%10%
2042
March1st to 15thNight
45%5%16%22%9%
1992
16th to endNight
49%6%14%24%5%
2112
April1st to 15thNight
45%410%25%12%1
1803
16th to endNight
53%5%7%17%14%2
1632
May1st to 15thNight
47%5%12%21%12%1
1518
16th to endNight
37%6%14%23%15%2
1498
June1st to 15thNight
33%6%16%28%12%1
1385
16th to endNight
25%8%15%28%17%4
1260
July1st to 15thNight
25%6%16%31%16%2
1223
16th to endNight
21%7%17%31%18%4
1459
August1st to 15thNight
27%7%14%31%15%4
1610
16th to endNight
27%6%16%28%18%3
1764
September1st to 15thNight
26%5%16%33%18%
1800
16th to endNight
33%5%13%32%13%
1870
October1st to 15thNight
35%411%30%15%2
1980
16th to endNight
46%414%21%11%
2112
November1st to 15thNight
41%5%13%23%15%1
2432
16th to endNight
47%6%17%18%8%1
2520
December1st to 15thNight
55%6%13%18%5%
2520
16th to endNight
62%5%11%14%5%
2688

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
20%8%37%25%5%2
90
16th to endDay
23%9%30%28%8%
96
February1st to 15thDay
15%21%36%22%4
90
16th to endDay
18%11%38%22%9%
81
March1st to 15thDay
24%7%34%27%5%
90
16th to endDay
29%9%20%31%9%
96
April1st to 15thDay
20%10%29%26%11%
263
16th to endDay
29%9%31%20%8%1
438
May1st to 15thDay
24%11%28%22%11%1
468
16th to endDay
20%6%30%26%13%2
517
June1st to 15thDay
14%6%31%27%17%2
495
16th to endDay
9%6%32%31%16%3
495
July1st to 15thDay
9%5%24%28%24%8%
475
16th to endDay
8%223%35%26%4
515
August1st to 15thDay
10%220%36%25%4
493
16th to endDay
13%422%32%20%5%
478
September1st to 15thDay
9%427%33%19%6%
315
16th to endDay
23%7%24%26%9%7%
105
October1st to 15thDay
6%11%33%22%17%8%
90
16th to endDay
26%8%31%17%15%1
96
November1st to 15thDay
10%6%26%38%14%3
90
16th to endDay
37%8%31%16%5%
90
December1st to 15thDay
14%15%40%22%7%
90
16th to endDay
33%14%33%17%1
96
January1st to 15thNight
11%10%35%30%9%2
900
16th to endNight
18%9%36%29%5%
960
February1st to 15thNight
13%9%35%32%7%1
880
16th to endNight
13%9%38%28%9%1
780
March1st to 15thNight
17%7%36%27%9%
552
16th to endNight
19%8%31%29%9%2
576
April1st to 15thNight
20%7%36%27%8%
539
16th to endNight
26%7%28%27%8%1
540
May1st to 15thNight
20%8%35%27%7%
540
16th to endNight
15%5%30%33%13%1
563
June1st to 15thNight
15%426%39%13%
540
16th to endNight
8%326%46%13%
540
July1st to 15thNight
5%226%40%23%
510
16th to endNight
5%122%45%22%1
564
August1st to 15thNight
9%215%44%26%1
539
16th to endNight
9%222%38%24%2
573
September1st to 15thNight
9%324%37%22%3
540
16th to endNight
13%7%31%26%19%2
526
October1st to 15thNight
15%8%32%28%13%1
660
16th to endNight
25%7%27%31%8%
704
November1st to 15thNight
15%10%33%30%9%
864
16th to endNight
18%12%33%25%10%
900
December1st to 15thNight
18%9%35%28%7%
900
16th to endNight
24%8%30%28%6%1
960
Page generated at 2017-09-20 03:49:51. Version ac04

Copyright 2017 A. Danko


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