IUP Northpointe Regional Campus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the IUP Northpointe Regional Campus clear sky chart from 2005-11-06 to 2024-01-14.

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%
23291
14%
74872
10%
23241
39%
23241
17%
53342

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 10thNight
12%
757
10%
2510
4%
757
20%
757
8%
2021
January11th to 20thNight
13%
735
6%
2386
2%
735
18%
735
7%
1957
January21st to endNight
15%
792
9%
2574
4%
792
21%
792
9%
2063
February1st to 10thNight
16%
720
9%
2340
5%
720
22%
720
9%
1859
February11th to 20thNight
11%
702
9%
2275
3%
700
19%
700
9%
1786
February21st to endNight
15%
592
13%
1783
5%
592
24%
592
11%
1396
March1st to 10thNight
20%
720
16%
1980
7%
720
28%
720
17%
1447
March11th to 20thNight
24%
720
17%
1980
9%
720
31%
720
17%
1417
March21st to endNight
22%
792
17%
2178
6%
792
30%
792
18%
1596
April1st to 10thNight
23%
720
14%
1864
5%
720
29%
720
20%
1374
April11th to 20thNight
29%
711
16%
1775
6%
711
33%
711
23%
1255
April21st to endNight
27%
546
18%
1626
8%
546
34%
546
21%
1117
May1st to 10thNight
36%
540
14%
1620
8%
540
41%
540
19%
1139
May11th to 20thNight
39%
528
16%
1590
10%
528
45%
528
21%
1106
May21st to endNight
53%
388
18%
1551
18%
388
61%
388
25%
885
June1st to 10thNight
49%
360
16%
1440
17%
360
57%
360
23%
847
June11th to 20thNight
50%
360
16%
1440
18%
360
57%
360
21%
880
June21st to endNight
51%
360
17%
1440
18%
360
59%
360
23%
849
July1st to 10thNight
57%
354
15%
1404
18%
354
61%
354
22%
854
July11th to 20thNight
62%
522
18%
1566
16%
522
65%
522
32%
946
July21st to endNight
60%
591
16%
1672
13%
558
62%
558
27%
1074
August1st to 10thNight
64%
537
18%
1600
15%
534
66%
534
31%
995
August11th to 20thNight
59%
534
19%
1598
15%
534
61%
534
29%
1022
August21st to endNight
58%
710
20%
1898
12%
710
60%
710
33%
1215
September1st to 10thNight
54%
720
22%
1800
12%
720
58%
720
34%
1173
September11th to 20thNight
61%
720
26%
1939
20%
720
64%
720
39%
1162
September21st to endNight
44%
720
20%
1998
15%
720
48%
720
25%
1348
October1st to 10thNight
45%
720
17%
2160
16%
720
48%
720
25%
1404
October11th to 20thNight
33%
720
16%
2160
11%
720
41%
720
22%
1450
October21st to endNight
29%
792
18%
2376
11%
792
38%
792
18%
1698
November1st to 10thNight
38%
740
21%
2277
16%
740
45%
740
24%
1464
November11th to 20thNight
26%
760
15%
2640
11%
760
34%
760
15%
1871
November21st to endNight
22%
760
13%
2660
9%
760
31%
760
13%
1945
December1st to 10thNight
15%
760
6%
2660
4%
760
19%
760
7%
2153
December11th to 20thNight
17%
759
8%
3253
5%
759
23%
759
7%
2528
December21st to endNight
16%
829
5%
4859
5%
817
22%
817
4%
4046

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
17%10%47%6%35%5%5%7%31%
74633
Night
17%10%47%6%3445%7%33%
75129
TransparencyDay
52%7%12%18%10%1
74349
Night
51%6%12%19%11%2
74932
SeeingDay
24%15%27%20%11%4
13566
Night
23%12%27%26%11%1
23304

By Month

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 10thDay
17%17%9%11%8%34345%20%
1653
11th to 20thDay
19%21%7%12%8%4333418%
1647
21st to endDay
18%17%8%12%9%44435%16%
1782
February1st to 10thDay
20%17%6%11%8%3434419%
1620
11th to 20thDay
17%15%7%13%7%36%446%19%
1573
21st to endDay
21%13%5%10%7%43436%24%
1470
March1st to 10thDay
16%11%6%9%6%3435%6%31%
1980
11th to 20thDay
19%12%5%8%436%5%45%29%
1980
21st to endDay
20%11%49%6%35%446%27%
2178
April1st to 10thDay
16%11%47%5%45%46%6%32%
2095
11th to 20thDay
18%10%46%7%35%45%6%32%
2142
21st to endDay
23%9%36%5%34446%33%
2340
May1st to 10thDay
19%9%47%6%45%5%6%7%29%
2340
11th to 20thDay
21%7%36%6%45%6%5%7%29%
2301
21st to endDay
13%6%25%6%46%6%7%9%38%
2725
June1st to 10thDay
15%7%35%7%45%6%6%8%34%
2520
11th to 20thDay
15%6%36%6%45%6%6%8%34%
2520
21st to endDay
15%6%35%6%45%5%6%10%37%
2520
July1st to 10thDay
12%6%35%5%45%5%6%8%39%
2511
11th to 20thDay
12%7%36%6%35%5%6%11%37%
2340
21st to endDay
12%6%36%7%47%7%6%8%34%
2547
August1st to 10thDay
10%6%36%8%47%6%8%10%33%
2327
11th to 20thDay
14%6%36%6%46%6%6%9%34%
2303
21st to endDay
13%5%35%6%46%6%8%9%37%
2440
September1st to 10thDay
16%7%26%5%35%45%6%42%
2160
11th to 20thDay
12%6%26%5%35%46%9%43%
2018
21st to endDay
19%7%36%5%345%5%6%37%
1960
October1st to 10thDay
17%7%36%5%246%6%7%37%
1800
11th to 20thDay
22%8%35%5%345%5%6%34%
1800
21st to endDay
25%10%36%5%34446%30%
1980
November1st to 10thDay
12%7%36%6%345%6%7%41%
1800
11th to 20thDay
19%13%46%5%3445%6%32%
1539
21st to endDay
19%16%47%6%35%5%5%5%25%
1520
December1st to 10thDay
21%18%8%10%6%43445%17%
1520
11th to 20thDay
20%17%9%9%5%34435%21%
1910
21st to endDay
26%21%7%10%6%3333415%
2772
January1st to 10thNight
19%17%7%9%6%35%5%3421%
2510
11th to 20thNight
20%16%6%11%7%35%44419%
2386
21st to endNight
18%17%7%10%7%34445%22%
2574
February1st to 10thNight
21%13%6%10%7%44445%23%
2340
11th to 20thNight
19%13%412%6%45%45%5%24%
2273
21st to endNight
20%13%5%10%7%25%45%5%25%
1783
March1st to 10thNight
17%10%47%6%35%5%47%32%
1980
11th to 20thNight
20%9%47%434447%34%
1980
21st to endNight
17%10%5%7%6%24445%34%
2178
April1st to 10thNight
18%11%46%4345%36%35%
1864
11th to 20thNight
16%7%36%5%45%5%5%7%37%
1775
21st to endNight
16%9%38%6%3445%8%35%
1626
May1st to 10thNight
19%7%36%5%35%6%5%6%34%
1620
11th to 20thNight
18%6%37%5%345%5%8%36%
1589
21st to endNight
10%5%25%5%35%5%6%10%44%
1550
June1st to 10thNight
11%5%16%6%345%5%8%45%
1440
11th to 20thNight
12%6%36%435%5%5%9%42%
1440
21st to endNight
11%5%246%35%5%7%10%42%
1440
July1st to 10thNight
10%437%6%345%5%9%44%
1444
11th to 20thNight
10%5%25%435%5%7%9%46%
1620
21st to endNight
10%6%36%6%45%6%7%9%38%
1771
August1st to 10thNight
7%5%26%5%36%5%7%9%46%
1611
11th to 20thNight
11%6%35%5%45%46%9%43%
1598
21st to endNight
11%425%435%6%6%9%44%
1898
September1st to 10thNight
13%5%245%346%5%6%48%
1800
11th to 20thNight
10%4243245%6%9%52%
1939
21st to endNight
15%8%35%435%45%6%41%
1998
October1st to 10thNight
14%6%36%5%345%5%7%43%
2160
11th to 20thNight
19%7%35%5%3445%7%38%
2160
21st to endNight
23%9%36%5%34447%33%
2376
November1st to 10thNight
14%8%35%4345%47%42%
2277
11th to 20thNight
19%12%45%6%45%45%7%30%
2640
21st to endNight
20%12%46%6%35%5%46%29%
2660
December1st to 10thNight
22%15%8%9%5%44445%19%
2660
11th to 20thNight
20%16%6%9%6%34445%22%
3285
21st to endNight
25%17%7%9%7%44445%14%
4884

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 10thDay
69%410%11%5%
1654
11th to 20thDay
72%411%11%2
1647
21st to endDay
73%410%9%41
1782
February1st to 10thDay
70%49%11%5%
1620
11th to 20thDay
67%5%10%12%5%
1582
21st to endDay
63%5%10%14%7%1
1470
March1st to 10thDay
54%6%12%19%8%
1980
11th to 20thDay
57%5%9%17%9%2
1980
21st to endDay
58%5%8%17%10%1
2178
April1st to 10thDay
52%6%10%18%11%2
2095
11th to 20thDay
52%6%10%16%14%2
2142
21st to endDay
53%5%11%20%11%2
2340
May1st to 10thDay
53%7%12%18%9%2
2340
11th to 20thDay
53%9%11%14%11%2
2305
21st to endDay
41%10%17%22%9%2
2725
June1st to 10thDay
46%8%13%21%11%1
2520
11th to 20thDay
45%9%14%19%11%1
2520
21st to endDay
43%8%12%26%10%1
2520
July1st to 10thDay
42%9%12%21%13%3
2441
11th to 20thDay
41%7%14%25%12%1
2271
21st to endDay
43%10%13%19%14%1
2405
August1st to 10thDay
43%9%16%25%8%
2314
11th to 20thDay
44%9%14%22%9%1
2303
21st to endDay
40%9%13%23%12%3
2440
September1st to 10thDay
43%7%10%21%16%3
2160
11th to 20thDay
37%6%15%26%14%1
2018
21st to endDay
47%6%12%21%14%1
1960
October1st to 10thDay
44%7%14%20%14%1
1800
11th to 20thDay
50%6%12%23%9%
1800
21st to endDay
56%5%13%17%9%1
1980
November1st to 10thDay
43%7%12%19%16%2
1800
11th to 20thDay
54%5%12%18%9%2
1539
21st to endDay
60%6%12%16%5%1
1520
December1st to 10thDay
71%6%10%10%3
1520
11th to 20thDay
68%411%15%3
1906
21st to endDay
76%410%8%2
2772
January1st to 10thNight
67%5%9%14%41
2510
11th to 20thNight
69%6%11%12%3
2386
21st to endNight
66%5%10%13%41
2574
February1st to 10thNight
65%410%15%5%
2340
11th to 20thNight
63%5%10%14%7%
2275
21st to endNight
61%6%8%16%9%1
1783
March1st to 10thNight
52%5%10%21%11%1
1980
11th to 20thNight
50%5%13%20%10%2
1980
21st to endNight
53%5%9%16%15%2
2178
April1st to 10thNight
51%6%10%19%13%1
1864
11th to 20thNight
46%7%12%17%15%3
1775
21st to endNight
47%6%10%22%12%3
1626
May1st to 10thNight
48%7%10%18%12%4
1620
11th to 20thNight
46%8%10%18%15%2
1590
21st to endNight
34%8%16%26%14%2
1551
June1st to 10thNight
37%8%14%25%15%2
1440
11th to 20thNight
39%9%13%24%14%2
1440
21st to endNight
36%10%14%23%16%1
1440
July1st to 10thNight
37%10%11%21%17%4
1404
11th to 20thNight
32%9%14%25%18%2
1566
21st to endNight
38%9%15%22%14%3
1672
August1st to 10thNight
34%8%15%27%16%
1600
11th to 20thNight
38%8%13%25%14%2
1598
21st to endNight
34%9%13%25%15%4
1898
September1st to 10thNight
35%8%13%22%18%4
1800
11th to 20thNight
29%6%14%28%21%1
1939
21st to endNight
43%6%12%21%16%2
1998
October1st to 10thNight
40%7%13%23%14%2
2160
11th to 20thNight
46%5%12%24%12%1
2160
21st to endNight
51%5%12%19%11%1
2376
November1st to 10thNight
41%6%12%21%16%4
2277
11th to 20thNight
54%5%11%19%10%2
2640
21st to endNight
56%6%12%20%6%1
2660
December1st to 10thNight
68%5%12%11%4
2660
11th to 20thNight
65%5%11%15%3
3288
21st to endNight
72%7%10%10%2
4884

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 10thDay
34%26%23%12%41
245
11th to 20thDay
37%25%28%6%21
249
21st to endDay
33%24%33%7%4
264
February1st to 10thDay
38%25%34%21
240
11th to 20thDay
42%25%28%5%
240
21st to endDay
36%30%26%7%1
242
March1st to 10thDay
32%21%30%13%3
420
11th to 20thDay
34%19%30%12%41
420
21st to endDay
33%19%28%16%41
462
April1st to 10thDay
30%20%25%17%7%1
420
11th to 20thDay
25%19%29%13%10%3
412
21st to endDay
30%20%26%17%5%2
420
May1st to 10thDay
28%18%27%17%6%4
423
11th to 20thDay
24%11%34%17%10%3
447
21st to endDay
16%10%27%25%17%5%
485
June1st to 10thDay
16%12%28%28%14%3
450
11th to 20thDay
18%15%24%25%14%4
450
21st to endDay
16%12%31%26%12%3
450
July1st to 10thDay
14%8%20%28%20%11%
445
11th to 20thDay
11%7%26%32%15%8%
444
21st to endDay
14%428%30%16%8%
488
August1st to 10thDay
11%7%24%25%22%10%
446
11th to 20thDay
15%7%22%28%16%12%
439
21st to endDay
12%6%25%27%19%10%
495
September1st to 10thDay
19%8%20%27%18%8%
450
11th to 20thDay
12%424%30%20%10%
450
21st to endDay
23%12%22%24%14%5%
450
October1st to 10thDay
18%11%26%22%19%4
450
11th to 20thDay
27%16%27%21%8%1
450
21st to endDay
32%15%28%18%6%
495
November1st to 10thDay
20%17%29%20%11%3
398
11th to 20thDay
31%20%30%13%5%2
189
21st to endDay
23%22%43%10%11
180
December1st to 10thDay
32%27%27%9%22
180
11th to 20thDay
34%23%28%12%3
180
21st to endDay
39%19%27%10%4
198
January1st to 10thNight
29%21%33%13%3
760
11th to 20thNight
32%16%33%16%3
735
21st to endNight
30%19%31%17%3
792
February1st to 10thNight
32%18%27%21%2
720
11th to 20thNight
31%20%35%14%1
703
21st to endNight
31%16%32%18%2
592
March1st to 10thNight
26%18%33%21%3
720
11th to 20thNight
29%17%27%20%6%1
720
21st to endNight
24%17%33%21%5%1
792
April1st to 10thNight
27%15%31%22%5%
720
11th to 20thNight
23%14%32%21%9%1
711
21st to endNight
20%11%34%29%6%
546
May1st to 10thNight
22%10%24%35%9%1
540
11th to 20thNight
22%8%27%33%10%
528
21st to endNight
12%425%34%22%3
389
June1st to 10thNight
11%428%41%14%1
360
11th to 20thNight
11%7%25%36%20%1
360
21st to endNight
11%429%37%19%1
360
July1st to 10thNight
12%218%40%24%3
354
11th to 20thNight
12%415%36%29%4
522
21st to endNight
13%314%41%27%1
591
August1st to 10thNight
9%315%44%27%3
537
11th to 20thNight
13%413%36%30%4
534
21st to endNight
11%322%33%26%5%
710
September1st to 10thNight
14%5%20%33%25%4
720
11th to 20thNight
11%418%36%27%4
720
21st to endNight
18%9%22%27%19%4
720
October1st to 10thNight
18%8%23%29%20%2
720
11th to 20thNight
23%11%30%27%9%1
720
21st to endNight
27%15%25%26%6%
792
November1st to 10thNight
19%12%27%31%11%
740
11th to 20thNight
26%15%28%22%7%1
760
21st to endNight
28%14%31%20%7%
760
December1st to 10thNight
34%19%27%16%4
760
11th to 20thNight
29%20%28%19%3
760
21st to endNight
31%18%28%21%2
836
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