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 2017-08-12.

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%
14947
20%
46505
9%
14910
44%
14910
22%
29512

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
14%
631
23%
1900
4%
631
36%
631
17%
1226
March1st to 15thNight
20%
720
20%
2055
6%
720
35%
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
38%
720
28%
1207
May1st to 15thNight
35%
497
17%
1577
9%
497
43%
497
21%
1036
May16th to endNight
46%
374
16%
1497
15%
374
52%
374
19%
916
June1st to 15thNight
46%
360
17%
1440
15%
360
57%
360
21%
861
June16th to endNight
50%
360
17%
1440
18%
360
57%
360
26%
827
July1st to 15thNight
49%
340
13%
1360
14%
340
53%
340
19%
833
July16th to endNight
61%
447
15%
1483
13%
419
66%
419
28%
853
August1st to 15thNight
61%
532
19%
1580
15%
529
64%
529
32%
974
August16th to endNight
59%
700
19%
1750
10%
700
60%
700
36%
1127
September1st to 15thNight
47%
660
26%
1650
12%
660
54%
660
33%
1062
September16th to endNight
52%
657
25%
1793
19%
657
56%
657
31%
1165
October1st to 15thNight
42%
660
23%
1980
18%
660
51%
660
25%
1251
October16th to endNight
33%
704
26%
2117
12%
704
49%
704
28%
1252
November1st to 15thNight
34%
700
22%
2277
11%
700
48%
700
24%
1374
November16th to endNight
25%
720
20%
2463
9%
720
39%
720
18%
1544
December1st to 15thNight
22%
720
16%
2520
6%
720
35%
720
14%
1682
December16th to endNight
19%
768
18%
2688
4%
768
36%
768
15%
1734

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%
47461
Night
15%5%2442445%7%41%
46682
Cloud CoverDay
15%6%25%5%3445%7%39%
47471
Night
15%5%2442445%7%41%
46687
TransparencyDay
42%5%11%22%14%2
47156
Night
41%412%23%16%2
46505
SeeingDay
19%12%26%23%13%5%
5529
Night
18%14%28%26%11%1
14949

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
12%5%146%36%6%7%8%36%
2272
16th to endDay
13%43443445%8%43%
2100
September1st to 15thDay
15%3244335%5%7%45%
1980
16th to endDay
14%6%35%434445%44%
1834
October1st to 15thDay
17%6%24323346%44%
1650
16th to endDay
18%6%143235%47%42%
1753
November1st to 15thDay
15%7%25%42235%6%45%
1581
16th to endDay
19%425%424446%41%
1494
December1st to 15thDay
18%7%25%6%3445%6%35%
1440
16th to endDay
19%6%35%42445%8%35%
1536
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
8%5%25%5%245%7%7%45%
1591
16th to endNight
11%5%13425%5%5%7%46%
1750
September1st to 15thNight
14%5%24323447%47%
1650
16th to endNight
14%5%25%425%445%45%
1793
October1st to 15thNight
18%5%25%324236%45%
1980
16th to endNight
18%41332245%8%46%
2117
November1st to 15thNight
13%6%24424445%47%
2277
16th to endNight
17%5%25%43445%7%39%
2463
December1st to 15thNight
18%6%36%5%35%5%5%6%34%
2520
16th to endNight
17%6%35%4245%5%7%36%
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
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
12%5%145%26%6%7%9%36%
2272
16th to endDay
13%5%2433445%8%43%
2100
September1st to 15thDay
15%42442445%6%45%
1980
16th to endDay
14%5%35%434345%44%
1834
October1st to 15thDay
17%6%2332345%6%45%
1650
16th to endDay
17%6%143235%5%7%41%
1753
November1st to 15thDay
15%6%2442325%7%45%
1581
16th to endDay
19%4245%24347%41%
1494
December1st to 15thDay
18%6%25%6%3445%6%36%
1440
16th to endDay
19%5%3442445%7%36%
1536
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
8%5%25%4345%6%8%45%
1591
16th to endNight
12%413435%45%7%46%
1750
September1st to 15thNight
14%5%24323447%47%
1650
16th to endNight
14%5%245%2445%5%45%
1793
October1st to 15thNight
17%5%24424246%45%
1980
16th to endNight
17%41332235%7%47%
2117
November1st to 15thNight
13%5%24423445%47%
2277
16th to endNight
18%4245%3445%7%39%
2463
December1st to 15thNight
19%6%26%5%35%45%5%34%
2520
16th to endNight
17%7%25%4245%5%7%36%
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
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%17%1
2259
16th to endDay
38%5%9%25%19%3
2100
September1st to 15thDay
37%5%11%20%21%3
1980
16th to endDay
41%37%22%22%3
1834
October1st to 15thDay
39%411%25%16%2
1650
16th to endDay
40%410%26%16%1
1753
November1st to 15thDay
40%313%21%17%3
1581
16th to endDay
43%310%27%13%1
1494
December1st to 15thDay
47%415%20%10%1
1440
16th to endDay
46%315%22%10%
1536
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
1580
16th to endNight
35%5%12%23%20%3
1750
September1st to 15thNight
35%6%10%22%22%3
1650
16th to endNight
38%5%6%21%23%3
1793
October1st to 15thNight
40%49%26%15%2
1980
16th to endNight
35%311%29%19%1
2117
November1st to 15thNight
38%310%23%16%6%
2277
16th to endNight
43%311%24%14%2
2463
December1st to 15thNight
49%413%20%11%
2520
16th to endNight
45%415%22%10%1
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
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
16%6%17%26%21%11%
297
16th to endDay
12%316%31%17%18%
268
September1st to 15thDay
14%8%19%25%20%12%
255
16th to endDay
20%5%18%22%18%15%
254
October1st to 15thDay
20%6%23%26%18%4
255
16th to endDay
14%17%30%26%10%
271
November1st to 15thDay
18%12%26%25%14%1
235
16th to endDay
21%21%34%14%7%
114
December1st to 15thDay
23%26%28%10%8%3
60
16th to endDay
32%23%25%17%1
64
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
11%314%42%25%3
532
16th to endNight
14%315%34%28%3
700
September1st to 15thNight
16%6%22%30%21%2
660
16th to endNight
15%5%19%28%27%3
657
October1st to 15thNight
19%9%21%29%17%2
660
16th to endNight
19%16%26%27%8%
704
November1st to 15thNight
16%14%30%26%11%1
700
16th to endNight
18%22%28%20%9%
720
December1st to 15thNight
22%18%31%19%7%
720
16th to endNight
21%20%33%22%1
768
Page generated at 2017-08-13 14:16:55. Version ac04

Copyright 2017 A. Danko


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