Higinbotham State Wildlife Managment Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Higinbotham State Wildlife Managment Area clear sky chart from 2005-11-05 to 2018-01-20.

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
36%
16809
13%
48476
8%
16764
41%
16764
21%
34306

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
30%
975
9%
2910
6%
970
34%
970
15%
2205
January16th to endNight
23%
985
10%
2769
4%
985
29%
985
13%
2218
February1st to 15thNight
37%
877
11%
2287
5%
875
41%
875
20%
1724
February16th to endNight
31%
759
13%
2021
6%
759
36%
759
17%
1551
March1st to 15thNight
32%
603
12%
2043
9%
603
36%
603
16%
1484
March16th to endNight
34%
576
14%
2112
11%
576
42%
576
16%
1468
April1st to 15thNight
35%
539
16%
1747
12%
539
44%
539
23%
1131
April16th to endNight
33%
540
14%
1620
11%
540
38%
540
19%
1161
May1st to 15thNight
32%
540
13%
1527
5%
540
36%
540
21%
1102
May16th to endNight
40%
563
14%
1375
5%
561
44%
561
33%
912
June1st to 15thNight
46%
540
8%
1260
4%
540
50%
540
32%
872
June16th to endNight
53%
540
9%
1260
5%
540
56%
540
35%
846
July1st to 15thNight
62%
510
14%
1190
8%
510
64%
510
49%
714
July16th to endNight
62%
564
17%
1292
7%
531
63%
531
45%
772
August1st to 15thNight
64%
539
20%
1610
14%
536
67%
536
40%
893
August16th to endNight
56%
573
22%
1719
20%
573
62%
573
38%
968
September1st to 15thNight
58%
540
19%
1826
19%
540
63%
540
37%
976
September16th to endNight
47%
537
23%
1980
20%
537
56%
537
27%
1139
October1st to 15thNight
36%
699
19%
2139
13%
699
41%
699
26%
1367
October16th to endNight
29%
870
14%
2406
6%
870
35%
870
19%
1760
November1st to 15thNight
29%
950
14%
2634
6%
950
35%
950
18%
1944
November16th to endNight
26%
975
12%
2730
6%
975
30%
975
15%
2096
December1st to 15thNight
26%
975
6%
2899
4%
975
29%
975
11%
2366
December16th to endNight
18%
1040
7%
3120
3%
1040
23%
1040
8%
2637

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%46%6%35%45%7%34%
49077
Night
11%9%47%5%3445%7%34%
48629
Cloud CoverDay
13%8%46%6%35%45%7%34%
49087
Night
11%9%47%6%35%5%5%6%35%
48632
Cloud CoverDay
13%9%46%6%35%45%7%34%
49088
Night
11%9%47%6%345%5%7%34%
48633
Cloud CoverDay
13%8%36%6%35%45%7%34%
49086
Night
11%9%47%6%345%5%7%34%
48633
TransparencyDay
49%6%14%22%7%
48746
Night
48%6%13%22%8%
48477
SeeingDay
16%8%28%28%15%3
6599
Night
16%6%31%32%12%1
16812

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
6%11%6%11%7%45%6%8%8%22%
1358
16th to endDay
10%14%7%11%8%47%5%6%5%17%
1557
February1st to 15thDay
8%10%6%9%9%37%5%6%5%27%
1575
16th to endDay
9%14%5%7%9%5%9%5%6%7%18%
1464
March1st to 15thDay
15%10%6%8%8%33446%27%
1906
16th to endDay
13%13%48%7%3435%7%29%
2112
April1st to 15thDay
13%9%35%5%36%46%7%33%
2198
16th to endDay
19%10%37%5%23446%30%
2340
May1st to 15thDay
20%9%36%5%34446%31%
2423
16th to endDay
17%7%25%5%35%348%35%
2737
June1st to 15thDay
20%5%35%425%5%5%8%34%
2700
16th to endDay
12%5%25%5%345%6%8%39%
2700
July1st to 15thDay
9%4245%345%6%9%44%
2700
16th to endDay
6%324335%5%7%9%48%
2786
August1st to 15thDay
11%4245%246%6%8%42%
2340
16th to endDay
11%5%14323347%51%
2483
September1st to 15thDay
12%6%24423347%47%
2132
16th to endDay
15%6%2442445%7%43%
1980
October1st to 15thDay
16%9%36%323346%38%
1809
16th to endDay
17%11%46%43445%8%29%
1816
November1st to 15thDay
14%12%5%9%42444433%
1554
16th to endDay
12%13%6%9%9%45%445%24%
1560
December1st to 15thDay
12%15%8%9%10%5%6%5%5%5%15%
1391
16th to endDay
12%16%7%12%9%35%5%35%18%
1456
January1st to 15thNight
7%11%7%10%8%45%6%6%6%24%
2910
16th to endNight
11%11%6%10%8%46%7%7%5%20%
2769
February1st to 15thNight
8%10%47%6%46%6%6%8%28%
2285
16th to endNight
8%10%5%8%9%5%6%5%6%6%27%
2021
March1st to 15thNight
10%12%5%8%6%36%5%5%6%30%
2031
16th to endNight
13%9%37%6%35%45%5%33%
2112
April1st to 15thNight
11%9%46%33335%8%39%
1747
16th to endNight
18%11%46%43335%5%33%
1620
May1st to 15thNight
18%9%36%423446%36%
1527
16th to endNight
12%4245%2445%9%43%
1374
June1st to 15thNight
14%5%144245%6%8%42%
1260
16th to endNight
7%423435%46%8%47%
1260
July1st to 15thNight
5%21231345%9%58%
1260
16th to endNight
431233446%10%54%
1380
August1st to 15thNight
7%21332345%7%56%
1620
16th to endNight
8%21441345%7%56%
1719
September1st to 15thNight
9%31321335%8%55%
1826
16th to endNight
15%41332345%7%48%
1980
October1st to 15thNight
15%6%2442346%7%41%
2139
16th to endNight
17%12%35%434447%32%
2406
November1st to 15thNight
12%12%6%8%5%33446%32%
2634
16th to endNight
11%11%5%9%7%45%5%5%6%26%
2730
December1st to 15thNight
9%14%7%12%8%5%7%5%45%19%
2899
16th to endNight
14%17%9%12%7%45%45%415%
3120

Percentage Cloud Cover NW (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
7%11%5%11%7%46%6%8%8%22%
1359
16th to endDay
10%15%6%12%7%47%5%6%5%17%
1557
February1st to 15thDay
8%10%6%9%8%37%47%5%26%
1575
16th to endDay
9%14%5%8%10%6%8%5%5%6%19%
1464
March1st to 15thDay
15%10%6%8%7%33346%28%
1917
16th to endDay
13%13%47%7%35%35%6%28%
2110
April1st to 15thDay
13%9%36%6%35%5%6%7%33%
2198
16th to endDay
19%10%37%6%24445%30%
2340
May1st to 15thDay
20%9%35%5%35%346%31%
2423
16th to endDay
17%7%25%5%35%448%35%
2737
June1st to 15thDay
19%6%3442445%9%34%
2700
16th to endDay
12%5%15%6%345%5%8%39%
2700
July1st to 15thDay
9%4245%25%5%6%9%44%
2700
16th to endDay
5%414425%5%7%9%48%
2786
August1st to 15thDay
10%4246%35%5%6%8%42%
2340
16th to endDay
10%5%14323348%52%
2483
September1st to 15thDay
12%5%25%413437%47%
2132
16th to endDay
15%5%25%32435%7%43%
1980
October1st to 15thDay
16%10%35%422346%39%
1809
16th to endDay
17%10%46%43445%7%30%
1816
November1st to 15thDay
14%12%5%9%42443433%
1554
16th to endDay
11%13%5%9%10%45%445%24%
1560
December1st to 15thDay
12%16%7%11%9%46%5%5%5%15%
1391
16th to endDay
12%16%7%12%8%445%45%18%
1456
January1st to 15thNight
7%11%7%10%8%45%6%7%6%24%
2910
16th to endNight
11%12%6%10%8%46%6%7%5%20%
2769
February1st to 15thNight
7%11%48%7%47%6%7%7%28%
2278
16th to endNight
8%10%5%9%9%5%6%5%5%6%27%
2021
March1st to 15thNight
10%12%5%8%6%35%5%46%29%
2043
16th to endNight
13%9%47%6%35%5%46%33%
2110
April1st to 15thNight
11%9%46%42345%8%39%
1747
16th to endNight
18%11%46%423445%34%
1620
May1st to 15thNight
18%9%37%323445%36%
1526
16th to endNight
12%5%15%42446%7%44%
1375
June1st to 15thNight
13%4244345%6%9%41%
1260
16th to endNight
7%425%4345%5%9%46%
1260
July1st to 15thNight
431222346%8%59%
1260
16th to endNight
431342447%10%54%
1380
August1st to 15thNight
7%21432345%7%55%
1620
16th to endNight
7%31342345%6%56%
1719
September1st to 15thNight
9%31331335%9%55%
1826
16th to endNight
15%413224447%49%
1980
October1st to 15thNight
15%6%2442345%8%42%
2139
16th to endNight
17%11%35%424447%32%
2406
November1st to 15thNight
12%12%5%8%5%24445%32%
2634
16th to endNight
11%10%5%9%7%46%5%5%6%27%
2730
December1st to 15thNight
9%14%7%11%9%46%5%5%5%19%
2899
16th to endNight
14%17%8%12%8%35%44415%
3120

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
6%12%6%10%7%45%6%8%8%21%
1358
16th to endDay
10%14%7%11%9%47%5%6%6%16%
1557
February1st to 15thDay
8%10%6%9%9%37%5%6%5%27%
1575
16th to endDay
10%13%5%8%8%5%9%6%5%7%18%
1464
March1st to 15thDay
15%10%6%8%8%34446%27%
1917
16th to endDay
14%13%38%7%3435%7%28%
2112
April1st to 15thDay
12%9%36%5%35%46%7%33%
2198
16th to endDay
19%10%47%6%24446%30%
2340
May1st to 15thDay
20%9%46%5%34447%31%
2423
16th to endDay
16%7%36%5%35%447%35%
2737
June1st to 15thDay
19%6%24435%5%5%8%33%
2700
16th to endDay
12%5%35%5%345%5%8%39%
2700
July1st to 15thDay
9%415%435%5%6%9%44%
2700
16th to endDay
6%324335%5%6%9%48%
2786
August1st to 15thDay
11%4245%25%6%6%8%42%
2340
16th to endDay
11%414323347%52%
2483
September1st to 15thDay
11%6%25%424348%47%
2132
16th to endDay
15%6%24423447%43%
1980
October1st to 15thDay
16%9%35%42235%6%38%
1809
16th to endDay
17%11%46%5%3345%8%29%
1816
November1st to 15thDay
14%12%5%9%41443433%
1554
16th to endDay
11%14%5%10%9%45%45%5%24%
1560
December1st to 15thDay
12%15%8%9%10%47%5%5%5%14%
1391
16th to endDay
11%17%7%11%9%35%5%35%17%
1456
January1st to 15thNight
7%11%7%10%8%45%6%6%6%24%
2910
16th to endNight
11%11%6%10%8%46%7%7%5%20%
2769
February1st to 15thNight
8%10%47%6%46%6%7%7%28%
2278
16th to endNight
8%10%5%9%9%5%6%46%6%27%
2021
March1st to 15thNight
10%12%5%8%5%36%447%30%
2043
16th to endNight
13%10%37%6%35%45%5%33%
2112
April1st to 15thNight
11%9%5%6%33335%8%39%
1747
16th to endNight
18%11%46%43335%433%
1620
May1st to 15thNight
18%9%46%423445%36%
1526
16th to endNight
12%5%246%245%6%8%43%
1374
June1st to 15thNight
14%4144245%6%9%41%
1260
16th to endNight
7%4235%35%5%6%8%46%
1260
July1st to 15thNight
5%3133135%5%9%58%
1260
16th to endNight
431332446%10%55%
1380
August1st to 15thNight
7%21443345%7%55%
1620
16th to endNight
8%323414447%56%
1719
September1st to 15thNight
9%31321335%8%55%
1826
16th to endNight
15%32322345%7%48%
1980
October1st to 15thNight
15%6%2442346%7%41%
2139
16th to endNight
17%11%35%5%24446%32%
2406
November1st to 15thNight
12%12%5%8%5%34436%32%
2634
16th to endNight
11%11%6%8%7%45%5%5%6%26%
2730
December1st to 15thNight
9%14%7%12%8%5%7%5%46%19%
2899
16th to endNight
14%17%8%12%8%35%44414%
3120

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
7%12%6%9%7%46%6%8%9%21%
1358
16th to endDay
10%14%7%11%9%46%6%6%6%16%
1557
February1st to 15thDay
8%10%6%8%9%37%5%6%5%27%
1575
16th to endDay
10%13%5%9%8%5%9%5%5%7%18%
1464
March1st to 15thDay
15%10%5%9%7%34446%27%
1917
16th to endDay
14%12%5%7%7%34446%29%
2110
April1st to 15thDay
12%10%35%5%345%6%6%33%
2198
16th to endDay
19%10%47%6%23445%31%
2340
May1st to 15thDay
20%9%36%5%34446%31%
2423
16th to endDay
17%6%25%5%34447%35%
2737
June1st to 15thDay
20%6%25%4345%5%8%33%
2700
16th to endDay
13%5%25%5%345%5%8%39%
2700
July1st to 15thDay
9%424435%5%6%8%44%
2700
16th to endDay
6%414435%5%7%9%48%
2786
August1st to 15thDay
11%4245%345%6%8%43%
2340
16th to endDay
11%424423338%51%
2483
September1st to 15thDay
12%6%24324348%47%
2132
16th to endDay
15%6%24423447%43%
1980
October1st to 15thDay
16%10%35%42225%7%38%
1809
16th to endDay
17%11%46%5%3345%8%29%
1816
November1st to 15thDay
14%13%5%9%5%23435%33%
1554
16th to endDay
12%14%6%9%10%45%445%24%
1560
December1st to 15thDay
12%16%7%10%9%5%7%5%45%14%
1391
16th to endDay
12%17%6%12%8%46%435%17%
1456
January1st to 15thNight
7%11%7%10%8%45%6%7%6%24%
2910
16th to endNight
11%11%7%9%8%5%6%7%7%5%19%
2769
February1st to 15thNight
8%10%47%6%46%6%7%7%29%
2278
16th to endNight
8%10%5%9%9%46%46%6%27%
2021
March1st to 15thNight
10%13%5%8%6%35%5%46%30%
2043
16th to endNight
13%10%37%5%35%446%33%
2112
April1st to 15thNight
12%9%45%5%2435%8%39%
1747
16th to endNight
19%11%46%42444434%
1620
May1st to 15thNight
18%9%46%423345%36%
1526
16th to endNight
12%5%235%2445%8%43%
1374
June1st to 15thNight
15%3144345%6%8%42%
1260
16th to endNight
7%4235%35%46%9%46%
1260
July1st to 15thNight
5%2123235%5%9%57%
1260
16th to endNight
5%2133245%6%9%55%
1380
August1st to 15thNight
7%31442345%7%55%
1620
16th to endNight
8%314413448%55%
1719
September1st to 15thNight
9%31331245%7%55%
1826
16th to endNight
15%32332345%7%48%
1980
October1st to 15thNight
15%6%2442446%7%41%
2139
16th to endNight
17%12%35%5%24446%32%
2406
November1st to 15thNight
12%12%5%8%5%34346%32%
2634
16th to endNight
11%11%5%9%7%45%5%5%6%26%
2730
December1st to 15thNight
9%14%7%11%8%46%6%46%19%
2899
16th to endNight
15%16%8%12%8%35%445%14%
3120

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%8%10%20%4
1359
16th to endDay
67%5%10%12%4
1557
February1st to 15thDay
55%6%14%18%5%
1576
16th to endDay
63%6%10%14%4
1464
March1st to 15thDay
57%414%17%5%
1917
16th to endDay
55%6%12%19%4
2112
April1st to 15thDay
48%5%13%21%9%
2198
16th to endDay
55%5%12%16%9%1
2340
May1st to 15thDay
54%5%11%20%7%
2423
16th to endDay
48%5%11%21%11%
2741
June1st to 15thDay
47%7%16%23%5%
2700
16th to endDay
41%6%18%25%7%
2700
July1st to 15thDay
34%8%15%29%11%
2541
16th to endDay
32%8%17%30%11%
2611
August1st to 15thDay
36%8%16%27%9%1
2326
16th to endDay
32%5%15%32%14%
2483
September1st to 15thDay
36%5%16%30%10%
2132
16th to endDay
41%5%16%30%5%
1980
October1st to 15thDay
46%5%14%24%9%
1809
16th to endDay
53%6%16%16%6%
1816
November1st to 15thDay
54%5%13%17%7%
1554
16th to endDay
63%6%11%12%6%
1560
December1st to 15thDay
70%5%10%11%2
1391
16th to endDay
69%410%10%5%
1456
January1st to 15thNight
56%6%11%18%6%
2910
16th to endNight
61%6%12%14%5%
2769
February1st to 15thNight
51%8%14%18%7%
2288
16th to endNight
56%6%11%19%6%
2021
March1st to 15thNight
54%6%12%19%7%
2043
16th to endNight
51%6%13%20%7%
2112
April1st to 15thNight
43%413%23%12%2
1747
16th to endNight
52%5%8%19%11%2
1620
May1st to 15thNight
50%5%10%21%11%1
1527
16th to endNight
37%6%13%27%13%2
1375
June1st to 15thNight
38%7%17%25%9%1
1260
16th to endNight
33%8%17%28%9%1
1260
July1st to 15thNight
21%8%17%37%13%1
1190
16th to endNight
25%6%16%31%18%1
1292
August1st to 15thNight
27%5%14%36%13%2
1610
16th to endNight
28%6%14%33%16%1
1719
September1st to 15thNight
26%6%18%35%12%
1826
16th to endNight
34%6%13%33%12%
1980
October1st to 15thNight
40%6%15%26%11%
2139
16th to endNight
51%5%13%22%6%
2406
November1st to 15thNight
53%5%11%19%8%1
2634
16th to endNight
57%6%16%13%6%
2730
December1st to 15thNight
65%5%12%12%3
2899
16th to endNight
71%5%8%9%4
3120

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
17%8%34%24%14%
135
16th to endDay
18%231%33%14%
109
February1st to 15thDay
16%14%44%18%5%
90
16th to endDay
20%6%39%28%31
81
March1st to 15thDay
17%13%27%31%8%1
90
16th to endDay
15%6%29%34%12%2
96
April1st to 15thDay
14%15%30%26%12%
317
16th to endDay
27%9%27%24%9%1
450
May1st to 15thDay
24%10%27%25%8%2
468
16th to endDay
19%8%29%25%14%3
517
June1st to 15thDay
19%8%27%28%13%2
495
16th to endDay
12%7%30%28%16%5%
495
July1st to 15thDay
11%5%23%28%23%7%
475
16th to endDay
6%428%30%23%6%
515
August1st to 15thDay
9%321%34%24%6%
493
16th to endDay
12%422%33%21%4
523
September1st to 15thDay
12%8%22%36%17%3
287
16th to endDay
18%8%36%20%11%5%
135
October1st to 15thDay
16%13%34%30%5%
135
16th to endDay
22%8%31%22%11%2
144
November1st to 15thDay
20%11%29%25%12%1
135
16th to endDay
30%18%29%17%3
135
December1st to 15thDay
27%10%26%28%6%
135
16th to endDay
17%11%40%17%11%2
144
January1st to 15thNight
12%6%35%31%10%1
975
16th to endNight
17%8%38%29%5%
985
February1st to 15thNight
14%6%28%36%12%2
880
16th to endNight
13%7%35%28%12%3
759
March1st to 15thNight
15%6%35%28%11%1
603
16th to endNight
19%6%31%27%12%2
576
April1st to 15thNight
17%7%35%30%7%
539
16th to endNight
24%6%28%29%10%
540
May1st to 15thNight
22%5%30%30%8%1
540
16th to endNight
14%336%31%13%
563
June1st to 15thNight
17%326%38%12%
540
16th to endNight
8%5%26%40%18%
540
July1st to 15thNight
6%225%41%22%1
510
16th to endNight
6%224%42%22%2
564
August1st to 15thNight
9%19%45%23%1
539
16th to endNight
10%325%38%20%1
573
September1st to 15thNight
10%225%39%19%2
540
16th to endNight
16%429%35%14%
537
October1st to 15thNight
19%7%31%33%7%
699
16th to endNight
23%9%29%28%8%
870
November1st to 15thNight
18%7%36%27%8%1
950
16th to endNight
17%10%36%26%7%1
975
December1st to 15thNight
16%7%34%30%10%
975
16th to endNight
24%6%33%25%8%1
1040
Page generated at 2018-01-21 11:19:29. Version ac04

Copyright 2018 A. Danko


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