Middleville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Middleville clear sky chart from 2005-11-05 to 2017-10-06.

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
31%
15083
18%
47070
9%
15052
42%
15052
21%
30513

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
20%
720
18%
2506
6%
716
34%
716
15%
1624
January16th to endNight
16%
768
19%
2569
4%
768
35%
768
15%
1657
February1st to 15thNight
12%
704
15%
2259
2%
701
28%
701
14%
1517
February16th to endNight
17%
631
24%
1893
6%
631
38%
631
17%
1230
March1st to 15thNight
19%
720
18%
2119
6%
720
33%
720
17%
1413
March16th to endNight
19%
768
21%
2016
7%
768
30%
768
20%
1343
April1st to 15thNight
20%
718
15%
1796
4%
718
26%
718
19%
1286
April16th to endNight
27%
720
18%
1800
3%
720
35%
720
25%
1236
May1st to 15thNight
30%
470
18%
1550
10%
470
39%
470
17%
1042
May16th to endNight
40%
374
15%
1497
12%
374
48%
374
18%
933
June1st to 15thNight
42%
360
14%
1440
12%
360
52%
360
18%
913
June16th to endNight
52%
360
14%
1440
14%
360
62%
360
25%
821
July1st to 15thNight
52%
340
13%
1360
16%
340
56%
340
21%
828
July16th to endNight
58%
376
15%
1418
15%
354
64%
354
26%
804
August1st to 15thNight
55%
557
17%
1628
12%
555
58%
555
32%
1025
August16th to endNight
55%
764
19%
1910
10%
764
57%
764
32%
1271
September1st to 15thNight
43%
720
22%
1800
10%
720
49%
720
32%
1183
September16th to endNight
50%
717
27%
1949
19%
717
56%
717
34%
1199
October1st to 15thNight
39%
684
20%
2033
15%
684
47%
684
25%
1307
October16th to endNight
27%
704
20%
2175
9%
704
41%
704
23%
1368
November1st to 15thNight
32%
700
21%
2277
10%
700
47%
700
22%
1414
November16th to endNight
27%
720
19%
2427
10%
720
39%
720
18%
1553
December1st to 15thNight
21%
720
13%
2520
5%
720
32%
720
13%
1732
December16th to endNight
16%
768
16%
2688
3%
768
31%
768
13%
1814

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
16%6%25%5%3445%7%38%
48130
Night
16%6%2442445%7%41%
47240
Cloud CoverDay
15%6%25%5%3445%7%38%
48139
Night
15%6%2442445%7%41%
47246
TransparencyDay
44%6%12%20%14%1
47818
Night
41%6%13%21%15%1
47070
SeeingDay
21%14%28%21%11%3
5798
Night
20%14%29%25%9%
15084

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%6%35%5%35%5%45%39%
1432
16th to endDay
13%6%35%5%445%5%6%38%
1653
February1st to 15thDay
15%7%27%5%3445%6%34%
1600
16th to endDay
15%7%37%5%35%445%37%
1580
March1st to 15thDay
16%7%35%5%3346%7%35%
1829
16th to endDay
17%7%245%2435%5%40%
2208
April1st to 15thDay
19%7%25%324346%39%
2152
16th to endDay
15%5%3443445%6%41%
2160
May1st to 15thDay
21%6%25%5%34447%34%
2411
16th to endDay
17%6%35%5%35%45%7%35%
2618
June1st to 15thDay
18%435%5%35%5%5%8%32%
2520
16th to endDay
14%5%35%6%35%5%5%7%37%
2520
July1st to 15thDay
12%5%26%5%46%6%5%10%34%
2520
16th to endDay
10%5%26%6%35%6%6%9%37%
2654
August1st to 15thDay
14%5%25%7%35%5%6%7%35%
2307
16th to endDay
13%5%24435%5%5%8%42%
2292
September1st to 15thDay
15%5%245%34446%43%
2160
16th to endDay
13%435%42445%6%45%
2010
October1st to 15thDay
17%6%25%423447%42%
1722
16th to endDay
20%5%14434446%41%
1695
November1st to 15thDay
18%8%23322336%45%
1581
16th to endDay
19%5%2333345%6%42%
1530
December1st to 15thDay
16%8%37%435%345%36%
1440
16th to endDay
20%8%35%42435%7%32%
1536
January1st to 15thNight
17%6%25%425%45%6%39%
2506
16th to endNight
14%8%35%5%2445%6%39%
2569
February1st to 15thNight
13%8%36%5%34445%38%
2258
16th to endNight
15%5%345%3345%5%42%
1893
March1st to 15thNight
17%7%245%24347%40%
2106
16th to endNight
16%7%24324447%41%
2016
April1st to 15thNight
17%7%25%5%2445%6%36%
1796
16th to endNight
17%5%2432445%7%42%
1800
May1st to 15thNight
18%7%245%24346%38%
1550
16th to endNight
16%5%1442445%7%41%
1495
June1st to 15thNight
18%5%2432445%6%40%
1440
16th to endNight
11%3144345%5%9%46%
1440
July1st to 15thNight
11%4235%35%5%5%10%42%
1440
16th to endNight
10%413226%6%7%10%44%
1514
August1st to 15thNight
11%5%234345%5%8%45%
1638
16th to endNight
14%41433446%9%44%
1910
September1st to 15thNight
15%5%23324346%47%
1800
16th to endNight
11%4245%23346%51%
1949
October1st to 15thNight
18%5%24333345%46%
2033
16th to endNight
19%5%13323446%44%
2175
November1st to 15thNight
15%6%25%323345%46%
2277
16th to endNight
16%5%35%424447%40%
2427
December1st to 15thNight
19%7%245%35%45%6%34%
2520
16th to endNight
18%8%345%34446%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
14%6%36%5%45%44440%
1432
16th to endDay
13%6%35%5%35%5%5%6%38%
1653
February1st to 15thDay
15%8%27%5%3445%6%35%
1600
16th to endDay
15%6%37%6%245%4438%
1580
March1st to 15thDay
17%8%25%5%2346%7%35%
1839
16th to endDay
17%7%25%6%34346%40%
2207
April1st to 15thDay
18%8%24424446%39%
2152
16th to endDay
15%5%345%3445%6%41%
2160
May1st to 15thDay
21%6%25%5%24447%34%
2411
16th to endDay
16%5%35%5%35%45%7%35%
2618
June1st to 15thDay
18%435%6%35%5%6%9%32%
2520
16th to endDay
14%5%35%5%36%5%5%8%36%
2520
July1st to 15thDay
11%6%25%6%45%6%6%9%34%
2520
16th to endDay
10%5%25%6%35%6%6%8%38%
2654
August1st to 15thDay
13%5%26%6%35%6%6%7%35%
2307
16th to endDay
13%4245%345%5%7%41%
2292
September1st to 15thDay
15%4245%34446%43%
2160
16th to endDay
13%425%423446%45%
2010
October1st to 15thDay
16%6%15%423447%42%
1722
16th to endDay
20%414424446%40%
1695
November1st to 15thDay
17%7%23322335%46%
1581
16th to endDay
19%5%2442445%5%42%
1530
December1st to 15thDay
16%8%36%434445%37%
1440
16th to endDay
19%8%46%424447%32%
1536
January1st to 15thNight
17%6%35%43445%6%39%
2506
16th to endNight
14%8%35%42445%6%39%
2569
February1st to 15thNight
13%8%37%5%34446%38%
2251
16th to endNight
15%5%345%3435%5%42%
1893
March1st to 15thNight
18%6%24424346%40%
2119
16th to endNight
16%7%34334446%41%
2016
April1st to 15thNight
17%6%35%5%2445%6%37%
1796
16th to endNight
17%5%2332445%6%42%
1800
May1st to 15thNight
18%7%34434347%37%
1550
16th to endNight
15%5%245%3445%7%41%
1495
June1st to 15thNight
18%5%24325%446%40%
1440
16th to endNight
10%3135%245%6%10%45%
1440
July1st to 15thNight
11%415%435%46%10%41%
1440
16th to endNight
10%423326%6%7%10%43%
1514
August1st to 15thNight
12%42343446%8%45%
1638
16th to endNight
14%41442436%9%43%
1910
September1st to 15thNight
15%5%2432335%6%47%
1800
16th to endNight
12%415%5%23336%51%
1949
October1st to 15thNight
18%5%24324346%45%
2033
16th to endNight
19%5%13323446%45%
2175
November1st to 15thNight
15%6%25%423346%46%
2277
16th to endNight
16%5%36%324447%40%
2427
December1st to 15thNight
19%7%35%5%35%45%6%34%
2520
16th to endNight
18%8%245%25%446%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%6%11%23%10%2
1433
16th to endDay
44%5%14%21%11%2
1653
February1st to 15thDay
48%5%12%19%12%1
1603
16th to endDay
47%5%10%23%11%1
1580
March1st to 15thDay
46%5%15%20%9%1
1839
16th to endDay
45%5%10%18%16%3
2208
April1st to 15thDay
45%5%10%21%13%3
2152
16th to endDay
41%6%9%19%19%3
2160
May1st to 15thDay
50%5%9%19%13%2
2411
16th to endDay
46%7%12%18%13%1
2622
June1st to 15thDay
48%8%12%20%10%
2520
16th to endDay
44%7%12%22%11%1
2520
July1st to 15thDay
44%7%12%18%14%1
2371
16th to endDay
41%7%14%22%12%1
2487
August1st to 15thDay
45%8%13%18%14%
2293
16th to endDay
39%6%10%23%17%1
2292
September1st to 15thDay
40%5%12%19%20%1
2160
16th to endDay
38%5%9%20%22%3
2010
October1st to 15thDay
41%7%12%19%16%2
1722
16th to endDay
43%6%12%22%13%1
1695
November1st to 15thDay
41%414%19%17%3
1581
16th to endDay
42%5%11%25%13%2
1530
December1st to 15thDay
48%6%15%17%10%1
1440
16th to endDay
50%6%15%16%10%
1536
January1st to 15thNight
44%5%14%20%12%2
2506
16th to endNight
43%5%12%24%13%1
2569
February1st to 15thNight
46%5%13%19%12%2
2259
16th to endNight
41%5%9%25%15%2
1893
March1st to 15thNight
45%414%21%12%2
2119
16th to endNight
41%411%21%17%2
2016
April1st to 15thNight
46%6%11%19%15%1
1796
16th to endNight
40%6%8%20%20%2
1800
May1st to 15thNight
46%6%10%19%15%1
1550
16th to endNight
40%9%14%19%13%2
1497
June1st to 15thNight
43%7%13%20%13%
1440
16th to endNight
33%8%16%28%12%
1440
July1st to 15thNight
37%10%14%22%14%1
1360
16th to endNight
31%9%19%22%13%2
1418
August1st to 15thNight
34%7%16%23%15%1
1628
16th to endNight
36%7%12%21%19%1
1910
September1st to 15thNight
37%5%11%24%19%
1800
16th to endNight
34%48%22%27%2
1949
October1st to 15thNight
41%411%23%17%1
2033
16th to endNight
39%5%14%24%14%
2175
November1st to 15thNight
39%5%12%20%17%3
2277
16th to endNight
43%5%14%23%12%1
2427
December1st to 15thNight
49%6%15%18%10%
2520
16th to endNight
48%6%13%20%10%
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
31%26%26%10%5%
60
16th to endDay
28%25%38%6%1
83
February1st to 15thDay
27%38%23%10%
117
16th to endDay
23%21%38%13%3
239
March1st to 15thDay
26%21%30%17%4
270
16th to endDay
22%23%33%12%5%2
288
April1st to 15thDay
25%18%30%17%6%1
270
16th to endDay
22%14%32%17%10%3
270
May1st to 15thDay
37%14%22%14%9%1
288
16th to endDay
18%11%30%25%10%2
331
June1st to 15thDay
21%13%25%25%12%1
315
16th to endDay
19%11%31%23%11%2
315
July1st to 15thDay
16%8%27%28%15%3
305
16th to endDay
13%7%26%28%19%5%
326
August1st to 15thDay
15%8%23%28%16%7%
313
16th to endDay
11%5%24%26%21%10%
332
September1st to 15thDay
16%10%27%21%14%8%
315
16th to endDay
17%5%25%21%17%13%
314
October1st to 15thDay
20%8%22%25%17%5%
278
16th to endDay
24%16%30%20%7%
260
November1st to 15thDay
23%16%24%22%11%2
235
16th to endDay
22%20%29%20%5%1
150
December1st to 15thDay
30%21%30%11%6%
60
16th to endDay
35%20%32%9%1
64
January1st to 15thNight
23%20%32%19%4
720
16th to endNight
21%22%36%18%1
768
February1st to 15thNight
23%21%38%16%
704
16th to endNight
25%21%33%18%1
631
March1st to 15thNight
26%22%29%19%2
720
16th to endNight
23%21%32%16%5%
768
April1st to 15thNight
23%20%32%20%3
718
16th to endNight
21%13%33%23%7%
720
May1st to 15thNight
21%14%29%27%7%
470
16th to endNight
17%7%29%34%10%
375
June1st to 15thNight
19%7%26%30%15%
360
16th to endNight
12%325%48%9%
360
July1st to 15thNight
13%326%40%16%
340
16th to endNight
9%223%42%19%1
376
August1st to 15thNight
13%121%37%23%2
557
16th to endNight
14%318%35%25%2
764
September1st to 15thNight
16%7%25%33%15%1
720
16th to endNight
14%423%27%24%5%
717
October1st to 15thNight
20%10%24%28%14%1
684
16th to endNight
23%16%29%24%6%
704
November1st to 15thNight
20%17%25%24%10%1
700
16th to endNight
21%19%28%21%8%
720
December1st to 15thNight
25%17%30%20%5%
720
16th to endNight
24%20%34%17%2
768
Page generated at 2017-10-07 14:07:43. Version ac04

Copyright 2017 A. Danko


Middleville Clear Sky Chart | Charts Home