Tuscarora Shale Pit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tuscarora Shale Pit clear sky chart from 2005-11-06 to 2024-01-13.

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%
23261
19%
74737
10%
23210
42%
23210
20%
48043

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
13%
757
19%
2643
4%
757
32%
757
13%
1710
January11th to 20thNight
18%
732
17%
2378
5%
732
32%
732
13%
1641
January21st to endNight
16%
792
22%
2574
6%
792
36%
792
15%
1690
February1st to 10thNight
19%
720
16%
2340
6%
720
32%
720
13%
1594
February11th to 20thNight
11%
703
17%
2268
2%
700
30%
700
11%
1511
February21st to endNight
14%
592
21%
1776
6%
592
31%
592
13%
1239
March1st to 10thNight
18%
720
22%
2007
7%
720
35%
720
19%
1287
March11th to 20thNight
21%
720
21%
1980
7%
720
33%
720
17%
1328
March21st to endNight
20%
792
19%
2155
7%
792
31%
792
19%
1470
April1st to 10thNight
18%
720
16%
1800
3%
720
26%
720
16%
1299
April11th to 20thNight
29%
711
20%
1775
6%
711
36%
711
25%
1199
April21st to endNight
26%
704
19%
1784
5%
704
34%
704
24%
1196
May1st to 10thNight
35%
540
17%
1620
9%
540
42%
540
21%
1101
May11th to 20thNight
31%
390
18%
1452
9%
390
42%
390
17%
934
May21st to endNight
44%
388
17%
1551
14%
388
52%
388
20%
916
June1st to 10thNight
46%
360
19%
1440
17%
360
58%
360
24%
822
June11th to 20thNight
45%
360
16%
1440
16%
360
53%
360
21%
862
June21st to endNight
50%
360
19%
1440
19%
360
60%
360
28%
776
July1st to 10thNight
50%
350
15%
1400
17%
350
55%
350
21%
821
July11th to 20thNight
59%
370
18%
1414
19%
370
63%
370
30%
751
July21st to endNight
54%
591
18%
1672
12%
558
59%
558
31%
1015
August1st to 10thNight
59%
537
19%
1600
14%
534
63%
534
32%
977
August11th to 20thNight
56%
560
20%
1624
13%
560
59%
560
28%
1033
August21st to endNight
53%
792
20%
1980
10%
792
55%
792
33%
1285
September1st to 10thNight
48%
720
22%
1800
10%
720
53%
720
33%
1189
September11th to 20thNight
52%
720
32%
1800
19%
720
58%
720
39%
1086
September21st to endNight
43%
720
22%
2074
15%
720
51%
720
26%
1338
October1st to 10thNight
42%
720
19%
2160
15%
720
49%
720
26%
1357
October11th to 20thNight
33%
720
22%
2160
13%
720
46%
720
25%
1357
October21st to endNight
30%
792
24%
2376
12%
792
45%
792
21%
1542
November1st to 10thNight
34%
740
26%
2335
15%
740
50%
740
28%
1339
November11th to 20thNight
26%
760
23%
2565
11%
760
42%
760
18%
1574
November21st to endNight
25%
760
21%
2660
10%
760
41%
760
17%
1630
December1st to 10thNight
18%
760
15%
2660
5%
760
31%
760
12%
1798
December11th to 20thNight
22%
760
16%
3219
6%
759
36%
759
12%
2091
December21st to endNight
21%
828
11%
4815
6%
817
34%
817
8%
3285

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%7%36%6%35%5%6%7%37%
74683
Night
15%7%36%5%35%5%6%7%39%
75066
TransparencyDay
46%5%12%22%14%2
74393
Night
43%412%24%15%2
74875
SeeingDay
24%16%27%20%10%3
13694
Night
21%15%25%26%11%1
23273

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
11%9%39%8%45%7%6%434%
1521
11th to 20thDay
14%9%5%9%6%46%5%5%7%29%
1638
21st to endDay
13%12%5%8%7%45%45%6%31%
1782
February1st to 10thDay
16%12%5%6%8%35%46%6%31%
1620
11th to 20thDay
14%8%48%8%445%5%7%34%
1578
21st to endDay
19%10%38%6%3445%6%33%
1480
March1st to 10thDay
13%7%36%5%35%45%7%42%
1952
11th to 20thDay
16%7%37%6%46%6%6%7%34%
1980
21st to endDay
18%9%36%6%44447%35%
2200
April1st to 10thDay
15%8%37%7%35%45%6%37%
2160
11th to 20thDay
16%7%37%6%345%5%6%39%
2134
21st to endDay
20%6%26%5%36%5%5%6%36%
2191
May1st to 10thDay
19%7%26%6%35%5%6%8%33%
2340
11th to 20thDay
22%6%35%6%35%5%5%7%33%
2442
21st to endDay
15%6%35%5%35%5%7%9%38%
2725
June1st to 10thDay
14%4346%46%6%6%9%38%
2520
11th to 20thDay
14%5%36%6%45%6%6%9%36%
2520
21st to endDay
11%425%5%46%6%7%11%41%
2520
July1st to 10thDay
9%5%35%6%5%6%7%6%8%39%
2520
11th to 20thDay
7%5%26%5%46%6%7%10%42%
2494
21st to endDay
10%6%27%7%37%6%7%9%36%
2547
August1st to 10thDay
10%5%26%7%5%7%7%8%9%34%
2327
11th to 20thDay
12%6%36%6%45%7%7%9%37%
2258
21st to endDay
14%6%25%5%45%5%7%8%38%
2376
September1st to 10thDay
18%6%25%5%3445%6%42%
2160
11th to 20thDay
15%42343445%8%48%
2160
21st to endDay
18%8%245%345%5%7%40%
1882
October1st to 10thDay
17%7%25%43435%7%42%
1800
11th to 20thDay
19%6%24435%5%5%7%40%
1800
21st to endDay
16%7%35%6%3445%6%40%
1980
November1st to 10thDay
12%5%35%43445%8%47%
1742
11th to 20thDay
16%6%36%5%345%5%8%39%
1612
21st to endDay
16%6%36%5%45%5%6%7%36%
1520
December1st to 10thDay
19%8%47%7%446%7%6%29%
1520
11th to 20thDay
17%9%46%5%445%5%7%33%
1910
21st to endDay
19%8%49%8%46%6%6%6%24%
2772
January1st to 10thNight
13%9%27%6%45%5%6%8%35%
2643
11th to 20thNight
17%8%37%5%45%7%7%6%31%
2378
21st to endNight
13%8%37%5%46%5%5%7%37%
2574
February1st to 10thNight
16%9%36%6%45%5%5%7%34%
2340
11th to 20thNight
15%8%46%5%45%5%6%7%35%
2266
21st to endNight
16%9%46%5%45%45%7%34%
1776
March1st to 10thNight
13%6%245%4445%6%45%
2007
11th to 20thNight
18%6%36%444446%42%
1980
21st to endNight
17%7%45%5%35%46%6%38%
2155
April1st to 10thNight
16%9%47%8%345%47%33%
1800
11th to 20thNight
14%6%45%44446%8%41%
1775
21st to endNight
18%6%245%3446%6%42%
1784
May1st to 10thNight
19%8%35%5%345%6%6%37%
1620
11th to 20thNight
19%6%345%35%5%5%7%38%
1451
21st to endNight
14%6%35%4346%6%8%41%
1550
June1st to 10thNight
13%7%244245%7%8%44%
1440
11th to 20thNight
13%5%35%5%35%5%7%8%40%
1440
21st to endNight
10%4244445%8%10%45%
1440
July1st to 10thNight
10%5%35%6%5%5%5%7%9%41%
1440
11th to 20thNight
7%424435%6%8%10%47%
1462
21st to endNight
10%5%25%6%45%5%6%9%43%
1771
August1st to 10thNight
9%5%25%6%446%7%11%42%
1611
11th to 20thNight
13%6%35%5%4446%7%43%
1624
21st to endNight
13%5%25%44446%10%43%
1980
September1st to 10thNight
16%5%35%5%3445%7%45%
1800
11th to 20thNight
13%5%1442345%7%53%
1800
21st to endNight
18%5%35%43446%7%42%
2074
October1st to 10thNight
18%6%25%33435%6%44%
2160
11th to 20thNight
16%5%25%43445%6%44%
2160
21st to endNight
18%6%35%5%345%6%6%41%
2376
November1st to 10thNight
10%7%2443445%6%52%
2335
11th to 20thNight
15%7%35%5%2445%7%42%
2565
21st to endNight
15%6%35%5%45%5%6%8%39%
2660
December1st to 10thNight
16%8%46%6%35%5%5%7%33%
2660
11th to 20thNight
17%8%36%5%45%6%5%6%35%
3285
21st to endNight
17%9%38%7%5%6%5%6%8%26%
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
50%410%22%11%2
1522
11th to 20thDay
55%313%18%10%1
1638
21st to endDay
54%411%19%10%2
1782
February1st to 10thDay
54%411%20%10%2
1620
11th to 20thDay
50%5%10%23%10%1
1587
21st to endDay
53%310%21%9%4
1480
March1st to 10thDay
43%312%25%14%2
1952
11th to 20thDay
48%411%18%14%4
1980
21st to endDay
50%410%19%15%3
2200
April1st to 10thDay
48%311%19%15%3
2160
11th to 20thDay
46%48%21%18%3
2134
21st to endDay
49%47%22%15%3
2191
May1st to 10thDay
49%5%10%21%14%2
2340
11th to 20thDay
51%5%10%18%13%3
2446
21st to endDay
43%5%18%21%12%2
2725
June1st to 10thDay
42%5%13%24%15%1
2520
11th to 20thDay
43%6%15%21%13%2
2520
21st to endDay
37%6%13%30%14%1
2520
July1st to 10thDay
41%7%12%23%15%3
2450
11th to 20thDay
36%5%14%25%18%2
2419
21st to endDay
43%6%11%22%16%2
2405
August1st to 10thDay
43%7%14%25%12%
2314
11th to 20thDay
42%7%12%23%15%1
2258
21st to endDay
42%412%23%15%3
2376
September1st to 10thDay
42%411%21%18%3
2160
11th to 20thDay
35%410%26%21%3
2160
21st to endDay
45%310%19%21%2
1882
October1st to 10thDay
42%5%11%24%16%3
1800
11th to 20thDay
43%411%25%17%1
1800
21st to endDay
45%39%25%16%2
1980
November1st to 10thDay
37%314%23%19%4
1742
11th to 20thDay
44%49%23%17%3
1612
21st to endDay
45%412%27%10%1
1520
December1st to 10thDay
53%413%20%9%1
1520
11th to 20thDay
50%312%26%7%1
1906
21st to endDay
59%5%13%15%7%1
2772
January1st to 10thNight
47%312%24%12%2
2643
11th to 20thNight
50%5%14%21%8%2
2378
21st to endNight
46%310%25%13%2
2574
February1st to 10thNight
50%413%23%9%1
2340
11th to 20thNight
48%312%20%15%2
2268
21st to endNight
51%410%20%13%3
1776
March1st to 10thNight
39%5%12%26%17%2
2007
11th to 20thNight
45%411%22%16%3
1980
21st to endNight
45%410%20%16%3
2155
April1st to 10thNight
50%410%18%15%3
1800
11th to 20thNight
41%410%23%18%4
1775
21st to endNight
43%410%24%16%4
1784
May1st to 10thNight
47%410%22%13%4
1620
11th to 20thNight
46%5%10%19%17%2
1452
21st to endNight
40%6%15%25%13%2
1551
June1st to 10thNight
38%5%12%26%17%3
1440
11th to 20thNight
41%5%13%23%15%2
1440
21st to endNight
33%5%16%28%17%1
1440
July1st to 10thNight
40%6%14%21%15%4
1400
11th to 20thNight
31%5%17%26%18%3
1414
21st to endNight
35%6%16%23%17%3
1672
August1st to 10thNight
36%6%16%28%15%1
1600
11th to 20thNight
40%413%23%18%1
1624
21st to endNight
37%5%14%24%17%3
1980
September1st to 10thNight
40%412%23%18%4
1800
11th to 20thNight
32%310%31%21%3
1800
21st to endNight
42%311%22%20%2
2074
October1st to 10thNight
42%311%26%16%2
2160
11th to 20thNight
40%310%29%15%2
2160
21st to endNight
43%48%26%18%1
2376
November1st to 10thNight
35%311%27%20%4
2335
11th to 20thNight
41%49%25%17%4
2565
21st to endNight
42%412%27%13%2
2660
December1st to 10thNight
50%413%22%10%1
2660
11th to 20thNight
48%5%12%23%12%1
3288
21st to endNight
55%414%19%7%1
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
37%24%27%8%21
182
11th to 20thDay
33%24%32%8%2
246
21st to endDay
34%32%24%7%2
264
February1st to 10thDay
37%29%25%7%1
240
11th to 20thDay
42%26%29%2
245
21st to endDay
40%20%26%13%1
346
March1st to 10thDay
33%20%28%17%2
420
11th to 20thDay
33%23%25%12%5%1
420
21st to endDay
32%24%27%11%5%1
462
April1st to 10thDay
28%25%28%14%5%
420
11th to 20thDay
25%22%25%16%9%3
412
21st to endDay
31%18%32%12%5%2
420
May1st to 10thDay
34%17%27%13%7%2
423
11th to 20thDay
26%18%27%19%9%1
447
21st to endDay
20%11%26%23%14%6%
485
June1st to 10thDay
20%14%29%21%13%3
450
11th to 20thDay
23%11%29%23%11%3
450
21st to endDay
13%12%33%26%13%2
450
July1st to 10thDay
16%5%24%30%16%9%
445
11th to 20thDay
8%6%30%33%18%6%
444
21st to endDay
14%8%30%29%14%5%
488
August1st to 10thDay
13%6%23%32%19%7%
446
11th to 20thDay
17%423%30%18%7%
439
21st to endDay
15%7%26%28%15%8%
495
September1st to 10thDay
23%8%22%24%15%8%
450
11th to 20thDay
17%5%25%28%18%7%
450
21st to endDay
28%13%24%18%14%4
450
October1st to 10thDay
24%10%24%22%17%3
450
11th to 20thDay
23%18%28%21%9%1
450
21st to endDay
23%19%34%16%7%1
495
November1st to 10thDay
19%19%29%22%10%2
400
11th to 20thDay
28%24%22%19%6%
272
21st to endDay
26%24%38%8%4
180
December1st to 10thDay
33%29%22%12%41
180
11th to 20thDay
32%24%30%11%21
180
21st to endDay
31%26%24%16%4
198
January1st to 10thNight
24%26%31%15%4
760
11th to 20thNight
26%22%27%21%3
732
21st to endNight
22%26%30%21%2
792
February1st to 10thNight
24%24%26%24%2
720
11th to 20thNight
27%30%28%15%1
703
21st to endNight
29%25%26%18%2
592
March1st to 10thNight
25%24%29%18%4
720
11th to 20thNight
27%21%26%19%6%1
720
21st to endNight
23%21%30%20%6%1
792
April1st to 10thNight
28%22%27%19%5%
720
11th to 20thNight
19%19%28%25%8%1
711
21st to endNight
24%14%28%25%8%
704
May1st to 10thNight
25%9%25%28%13%
540
11th to 20thNight
21%12%30%28%9%
390
21st to endNight
17%10%21%32%19%1
389
June1st to 10thNight
15%5%25%35%19%1
360
11th to 20thNight
16%7%23%34%19%1
360
21st to endNight
12%427%41%16%
360
July1st to 10thNight
14%221%38%22%3
350
11th to 20thNight
9%221%41%24%2
370
21st to endNight
12%320%40%23%3
591
August1st to 10thNight
12%115%42%27%3
537
11th to 20thNight
17%314%37%26%4
560
21st to endNight
14%419%34%26%4
792
September1st to 10thNight
19%320%31%23%3
720
11th to 20thNight
15%6%20%28%26%6%
720
21st to endNight
21%8%20%28%21%3
720
October1st to 10thNight
22%8%19%28%19%3
720
11th to 20thNight
21%15%26%27%11%1
720
21st to endNight
23%17%26%25%9%1
792
November1st to 10thNight
16%15%30%28%11%1
740
11th to 20thNight
21%22%25%24%7%1
760
21st to endNight
20%21%28%23%6%
760
December1st to 10thNight
26%24%27%17%6%1
760
11th to 20thNight
24%20%28%23%4
760
21st to endNight
23%20%29%25%3
836
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