Middle Creek Wildlife Management Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Middle Creek Wildlife Management Area clear sky chart from 2005-11-05 to 2017-12-20.

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
33%
15468
20%
48063
10%
15431
44%
15431
23%
30426

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
19%
719
19%
2500
7%
716
35%
716
15%
1615
January16th to endNight
16%
768
22%
2496
5%
768
37%
768
19%
1555
February1st to 15thNight
14%
704
17%
2287
4%
701
31%
701
15%
1490
February16th to endNight
15%
631
23%
1900
4%
631
36%
631
17%
1226
March1st to 15thNight
19%
720
20%
2055
6%
720
34%
720
20%
1362
March16th to endNight
22%
768
22%
2056
8%
768
35%
768
24%
1361
April1st to 15thNight
21%
718
18%
1796
4%
718
29%
718
24%
1205
April16th to endNight
31%
720
18%
1800
4%
720
39%
720
28%
1207
May1st to 15thNight
35%
497
17%
1577
9%
497
43%
497
21%
1036
May16th to endNight
46%
374
16%
1497
14%
374
53%
374
19%
916
June1st to 15thNight
46%
360
17%
1440
15%
360
56%
360
21%
861
June16th to endNight
49%
360
17%
1440
18%
360
56%
360
26%
827
July1st to 15thNight
49%
340
13%
1360
14%
340
53%
340
19%
833
July16th to endNight
60%
447
15%
1483
13%
419
65%
419
28%
853
August1st to 15thNight
61%
545
19%
1615
15%
542
63%
542
32%
997
August16th to endNight
59%
764
20%
1910
11%
764
61%
764
36%
1223
September1st to 15thNight
46%
720
24%
1800
11%
720
52%
720
33%
1156
September16th to endNight
54%
717
27%
1956
21%
717
58%
717
32%
1251
October1st to 15thNight
43%
720
21%
2160
17%
720
51%
720
25%
1372
October16th to endNight
34%
768
28%
2310
15%
768
50%
768
29%
1352
November1st to 15thNight
35%
760
22%
2472
11%
760
49%
760
25%
1492
November16th to endNight
26%
780
22%
2668
10%
780
41%
780
19%
1636
December1st to 15thNight
22%
780
15%
2730
6%
780
35%
780
14%
1831
December16th to endNight
19%
788
18%
2755
4%
788
36%
788
16%
1769

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
15%6%25%5%3445%7%39%
48770
Night
15%5%2442445%7%41%
48240
Cloud CoverDay
15%6%25%5%3445%7%39%
48780
Night
15%5%2442445%7%42%
48245
TransparencyDay
42%5%11%23%14%2
48465
Night
41%412%23%16%2
48063
SeeingDay
19%13%25%23%13%5%
5969
Night
18%14%28%26%11%1
15470

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
14%8%25%5%345%5%7%35%
1435
16th to endDay
14%8%36%43445%6%37%
1728
February1st to 15thDay
15%8%35%5%35%5%5%6%35%
1575
16th to endDay
14%7%37%5%34446%37%
1572
March1st to 15thDay
15%4346%445%5%6%37%
1891
16th to endDay
19%6%35%5%2335%6%38%
2166
April1st to 15thDay
18%6%24323447%40%
2152
16th to endDay
16%4245%24447%44%
2160
May1st to 15thDay
18%6%245%35%5%5%6%35%
2384
16th to endDay
16%6%25%426%46%7%36%
2618
June1st to 15thDay
13%5%25%436%6%6%10%37%
2520
16th to endDay
11%5%25%5%3447%10%39%
2520
July1st to 15thDay
10%5%26%6%36%6%7%9%35%
2520
16th to endDay
7%5%25%6%47%6%7%9%38%
2580
August1st to 15thDay
13%5%246%36%6%7%8%35%
2322
16th to endDay
12%42443446%8%43%
2292
September1st to 15thDay
16%42443345%6%44%
2160
16th to endDay
13%5%34434445%45%
2001
October1st to 15thDay
18%6%24323346%44%
1800
16th to endDay
17%5%2432345%7%43%
1912
November1st to 15thDay
16%6%25%42235%6%44%
1716
16th to endDay
18%424424346%43%
1618
December1st to 15thDay
17%7%246%3445%6%36%
1560
16th to endDay
19%6%35%42445%8%35%
1568
January1st to 15thNight
16%7%35%6%3445%7%37%
2500
16th to endNight
15%8%25%423347%41%
2496
February1st to 15thNight
14%7%36%6%24446%38%
2285
16th to endNight
15%6%345%25%447%41%
1900
March1st to 15thNight
16%6%245%34446%41%
2043
16th to endNight
17%6%33423347%43%
2056
April1st to 15thNight
16%5%345%2346%7%40%
1796
16th to endNight
16%5%25%423446%44%
1800
May1st to 15thNight
19%5%2433445%7%37%
1577
16th to endNight
14%5%25%5%345%5%7%39%
1495
June1st to 15thNight
14%435%33446%8%42%
1440
16th to endNight
10%424436%46%9%43%
1440
July1st to 15thNight
9%5%36%6%35%47%9%38%
1440
16th to endNight
8%5%145%35%5%7%10%42%
1585
August1st to 15thNight
9%5%25%42447%7%44%
1626
16th to endNight
11%413435%5%6%7%46%
1910
September1st to 15thNight
14%5%24323447%47%
1800
16th to endNight
13%414425%45%6%46%
1956
October1st to 15thNight
18%5%25%324236%45%
2160
16th to endNight
17%41332235%8%47%
2310
November1st to 15thNight
13%5%24424445%47%
2472
16th to endNight
16%425%424447%41%
2668
December1st to 15thNight
18%6%36%5%35%5%5%6%33%
2730
16th to endNight
17%6%35%4245%5%8%36%
2755

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
15%7%25%6%3445%7%35%
1435
16th to endDay
14%8%46%5%34447%36%
1728
February1st to 15thDay
15%7%35%5%25%5%5%6%35%
1575
16th to endDay
14%7%37%5%34446%37%
1572
March1st to 15thDay
15%5%35%6%45%5%5%6%37%
1902
16th to endDay
19%7%345%2335%5%39%
2165
April1st to 15thDay
18%6%3442345%7%40%
2152
16th to endDay
16%424433447%44%
2160
May1st to 15thDay
18%6%245%35%5%5%7%35%
2384
16th to endDay
15%6%25%435%5%6%7%36%
2618
June1st to 15thDay
13%5%25%435%6%6%9%37%
2520
16th to endDay
12%425%5%3446%10%39%
2520
July1st to 15thDay
10%5%35%5%45%6%7%9%35%
2520
16th to endDay
7%5%246%46%7%7%9%38%
2580
August1st to 15thDay
13%5%145%26%6%7%8%36%
2322
16th to endDay
12%42433446%8%43%
2292
September1st to 15thDay
15%42442445%6%45%
2160
16th to endDay
13%5%35%434345%45%
2001
October1st to 15thDay
18%6%23323345%44%
1800
16th to endDay
16%6%143235%5%7%43%
1912
November1st to 15thDay
16%6%25%5%2325%6%44%
1716
16th to endDay
18%4245%24346%43%
1618
December1st to 15thDay
17%7%25%5%3445%6%36%
1560
16th to endDay
19%5%3442445%7%36%
1568
January1st to 15thNight
16%7%35%5%3445%7%37%
2500
16th to endNight
15%7%35%42435%6%41%
2496
February1st to 15thNight
14%7%35%6%3445%6%39%
2278
16th to endNight
15%5%34425%446%42%
1900
March1st to 15thNight
17%6%25%5%34346%41%
2055
16th to endNight
17%7%33323347%43%
2056
April1st to 15thNight
16%5%3442346%7%40%
1796
16th to endNight
15%5%25%423446%44%
1800
May1st to 15thNight
19%5%25%424447%38%
1577
16th to endNight
14%5%26%5%25%45%7%40%
1495
June1st to 15thNight
14%43433446%8%42%
1440
16th to endNight
10%424436%46%10%42%
1440
July1st to 15thNight
9%5%36%5%45%47%10%37%
1440
16th to endNight
8%4245%35%5%7%10%42%
1585
August1st to 15thNight
9%5%25%4245%6%8%45%
1626
16th to endNight
12%413435%46%7%46%
1910
September1st to 15thNight
14%5%233235%47%47%
1800
16th to endNight
13%4245%245%5%6%46%
1956
October1st to 15thNight
18%6%34323246%45%
2160
16th to endNight
17%41332235%7%48%
2310
November1st to 15thNight
13%5%24423446%47%
2472
16th to endNight
17%424434447%41%
2668
December1st to 15thNight
18%6%26%5%35%5%6%5%34%
2730
16th to endNight
17%7%25%4245%5%8%36%
2755

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
46%413%21%10%2
1436
16th to endDay
46%413%22%11%1
1728
February1st to 15thDay
46%5%11%22%11%2
1577
16th to endDay
48%311%23%10%1
1572
March1st to 15thDay
46%412%22%11%1
1902
16th to endDay
46%49%20%16%2
2166
April1st to 15thDay
43%49%23%15%3
2152
16th to endDay
39%410%21%19%5%
2160
May1st to 15thDay
46%6%9%20%14%2
2384
16th to endDay
44%6%12%21%12%1
2622
June1st to 15thDay
40%8%12%25%11%1
2520
16th to endDay
38%6%15%24%12%1
2520
July1st to 15thDay
42%6%11%22%15%2
2371
16th to endDay
37%7%13%25%14%1
2419
August1st to 15thDay
41%6%12%21%16%1
2309
16th to endDay
37%410%25%18%2
2292
September1st to 15thDay
38%5%11%20%20%3
2160
16th to endDay
39%37%23%22%2
2001
October1st to 15thDay
41%411%24%17%1
1800
16th to endDay
39%410%27%17%
1912
November1st to 15thDay
41%314%21%16%3
1716
16th to endDay
41%310%28%14%1
1618
December1st to 15thDay
47%415%21%10%
1560
16th to endDay
46%416%22%9%
1568
January1st to 15thNight
45%412%20%13%3
2500
16th to endNight
42%213%26%13%1
2496
February1st to 15thNight
46%312%23%12%1
2287
16th to endNight
42%410%23%17%2
1900
March1st to 15thNight
43%411%23%15%1
2055
16th to endNight
42%310%23%16%2
2056
April1st to 15thNight
41%311%22%17%3
1796
16th to endNight
39%5%10%19%20%4
1800
May1st to 15thNight
44%5%10%19%16%2
1577
16th to endNight
41%6%14%17%16%3
1497
June1st to 15thNight
39%6%12%22%17%
1440
16th to endNight
35%6%13%27%15%1
1440
July1st to 15thNight
42%5%13%21%12%3
1360
16th to endNight
32%8%17%24%15%2
1483
August1st to 15thNight
35%6%13%24%19%1
1615
16th to endNight
34%5%12%23%20%2
1910
September1st to 15thNight
35%6%10%22%22%3
1800
16th to endNight
37%5%7%22%24%3
1956
October1st to 15thNight
41%39%26%16%2
2160
16th to endNight
34%310%31%18%1
2310
November1st to 15thNight
38%311%23%16%5%
2472
16th to endNight
41%310%25%16%2
2668
December1st to 15thNight
49%413%20%11%1
2730
16th to endNight
44%416%22%10%
2755

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%34%31%8%3
61
16th to endDay
23%31%30%12%2
96
February1st to 15thDay
28%33%26%11%
90
16th to endDay
21%22%38%15%2
231
March1st to 15thDay
19%23%31%20%5%
270
16th to endDay
22%19%33%17%42
288
April1st to 15thDay
22%17%28%20%7%2
270
16th to endDay
22%11%30%20%9%5%
270
May1st to 15thDay
29%17%22%16%10%3
288
16th to endDay
20%8%27%20%20%2
331
June1st to 15thDay
18%12%24%25%16%2
315
16th to endDay
16%8%30%29%11%2
315
July1st to 15thDay
16%321%33%20%3
305
16th to endDay
9%322%35%19%9%
326
August1st to 15thDay
17%6%17%26%20%10%
313
16th to endDay
12%317%32%18%16%
332
September1st to 15thDay
16%9%20%22%19%10%
315
16th to endDay
16%7%16%23%20%15%
314
October1st to 15thDay
22%6%22%23%19%5%
315
16th to endDay
14%19%29%22%12%1
334
November1st to 15thDay
19%11%28%25%13%1
280
16th to endDay
19%23%35%14%6%
148
December1st to 15thDay
22%24%31%11%8%2
90
16th to endDay
30%25%25%18%1
72
January1st to 15thNight
19%23%32%20%4
720
16th to endNight
21%21%35%19%1
768
February1st to 15thNight
19%23%36%19%1
704
16th to endNight
19%27%34%14%3
631
March1st to 15thNight
21%19%35%19%4
720
16th to endNight
19%18%35%19%6%
768
April1st to 15thNight
20%21%34%19%4
718
16th to endNight
17%14%31%26%9%
720
May1st to 15thNight
20%9%30%29%8%
497
16th to endNight
15%8%23%35%15%1
375
June1st to 15thNight
16%424%39%14%
360
16th to endNight
11%228%46%11%
360
July1st to 15thNight
11%423%40%19%
340
16th to endNight
10%218%40%25%2
447
August1st to 15thNight
12%213%42%25%3
545
16th to endNight
14%315%35%28%3
764
September1st to 15thNight
16%5%23%30%21%2
720
16th to endNight
14%5%18%28%28%4
717
October1st to 15thNight
20%9%20%29%17%3
720
16th to endNight
19%15%26%27%10%
768
November1st to 15thNight
16%13%30%26%12%1
760
16th to endNight
17%21%29%21%8%
780
December1st to 15thNight
22%18%31%20%7%
780
16th to endNight
21%20%33%22%1
788
Page generated at 2017-12-21 07:04:55. Version ac04

Copyright 2017 A. Danko


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