Teeples Hill
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Teeples Hill clear sky chart from 2005-11-05 to 2017-09-19.

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
26%
14674
13%
46886
7%
14644
33%
14644
16%
33445

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
12%
720
6%
2506
2%
716
17%
716
6%
2050
January16th to endNight
17%
768
11%
2595
5%
768
25%
768
11%
1971
February1st to 15thNight
13%
702
9%
2287
3%
701
21%
701
10%
1763
February16th to endNight
16%
631
14%
1985
4%
631
28%
631
12%
1443
March1st to 15thNight
15%
720
13%
2051
5%
720
23%
720
13%
1531
March16th to endNight
28%
768
20%
2067
8%
768
37%
768
21%
1421
April1st to 15thNight
19%
718
15%
1796
5%
718
26%
718
18%
1337
April16th to endNight
30%
630
18%
1710
8%
630
36%
630
21%
1196
May1st to 15thNight
32%
369
17%
1449
14%
369
42%
369
17%
948
May16th to endNight
31%
375
14%
1497
9%
374
44%
374
18%
926
June1st to 15thNight
28%
360
9%
1440
6%
360
39%
360
15%
941
June16th to endNight
36%
360
9%
1440
11%
360
43%
360
19%
903
July1st to 15thNight
44%
340
15%
1360
19%
340
52%
340
28%
745
July16th to endNight
48%
376
14%
1418
13%
354
55%
354
27%
792
August1st to 15thNight
49%
497
14%
1568
10%
495
54%
495
27%
975
August16th to endNight
48%
675
20%
1821
9%
675
54%
675
36%
1122
September1st to 15thNight
40%
720
16%
1800
7%
720
43%
720
29%
1229
September16th to endNight
43%
673
22%
1851
13%
673
49%
673
30%
1187
October1st to 15thNight
27%
660
16%
1980
10%
660
37%
660
18%
1392
October16th to endNight
19%
704
10%
2164
4%
704
27%
704
11%
1699
November1st to 15thNight
25%
700
17%
2373
13%
700
33%
700
15%
1686
November16th to endNight
17%
720
10%
2520
7%
720
22%
720
9%
1959
December1st to 15thNight
14%
720
7%
2520
2%
720
19%
720
7%
2041
December16th to endNight
10%
768
8%
2688
3%
768
18%
768
7%
2188

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%34446%30%
47935
Night
15%10%47%6%34446%32%
47057
TransparencyDay
53%5%10%18%9%1
47623
Night
52%5%11%19%9%
46887
SeeingDay
23%14%30%19%8%3
5418
Night
22%15%30%22%8%
14676

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
18%14%5%11%6%3444421%
1432
16th to endDay
13%16%5%10%9%5%4345%20%
1626
February1st to 15thDay
12%15%6%12%9%45%445%20%
1575
16th to endDay
17%16%5%9%5%4444424%
1488
March1st to 15thDay
14%13%5%9%9%35%335%25%
1894
16th to endDay
12%10%47%6%34445%37%
2157
April1st to 15thDay
21%13%45%5%23335%32%
2152
16th to endDay
21%8%45%42333438%
2259
May1st to 15thDay
19%9%37%424446%32%
2501
16th to endDay
15%7%36%6%35%45%7%34%
2618
June1st to 15thDay
22%8%35%6%3435%7%29%
2520
16th to endDay
16%6%26%5%35%5%5%8%31%
2520
July1st to 15thDay
12%6%36%5%35%5%6%9%35%
2520
16th to endDay
11%5%26%7%46%6%6%9%33%
2654
August1st to 15thDay
12%7%27%7%45%45%7%33%
2380
16th to endDay
13%5%26%6%45%5%5%8%35%
2369
September1st to 15thDay
17%7%36%433347%39%
2160
16th to endDay
16%6%25%5%33446%41%
1854
October1st to 15thDay
21%11%36%5%34436%30%
1650
16th to endDay
26%13%47%5%3343322%
1708
November1st to 15thDay
15%11%36%6%245%36%33%
1482
16th to endDay
21%14%6%7%6%25%44421%
1440
December1st to 15thDay
19%17%6%10%8%45%43414%
1440
16th to endDay
20%18%7%10%6%2433418%
1536
January1st to 15thNight
15%14%6%12%9%47%445%16%
2506
16th to endNight
11%15%5%9%9%3445%5%23%
2595
February1st to 15thNight
12%14%7%10%8%44445%22%
2285
16th to endNight
13%11%5%8%7%4445%6%28%
1985
March1st to 15thNight
16%13%5%8%7%3434429%
2040
16th to endNight
12%8%46%6%23346%39%
2067
April1st to 15thNight
20%10%45%5%24345%33%
1796
16th to endNight
17%7%35%433447%37%
1710
May1st to 15thNight
19%9%36%433435%37%
1449
16th to endNight
14%6%245%25%5%6%8%38%
1495
June1st to 15thNight
18%6%36%425%35%7%35%
1440
16th to endNight
15%5%25%5%35%5%5%8%38%
1440
July1st to 15thNight
8%435%5%25%45%7%47%
1440
16th to endNight
9%4235%335%6%8%47%
1514
August1st to 15thNight
8%5%25%6%3446%8%43%
1578
16th to endNight
8%42442445%8%49%
1821
September1st to 15thNight
14%6%2443445%6%42%
1800
16th to endNight
15%6%24312346%47%
1851
October1st to 15thNight
21%8%36%5%23445%35%
1980
16th to endNight
22%12%46%6%35%336%24%
2164
November1st to 15thNight
15%10%47%5%35%445%32%
2373
16th to endNight
20%13%5%8%7%24345%22%
2520
December1st to 15thNight
18%17%7%9%6%34435%18%
2520
16th to endNight
22%15%6%11%6%3433418%
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
64%5%9%12%6%1
1433
16th to endDay
65%5%7%11%8%1
1626
February1st to 15thDay
65%411%13%4
1577
16th to endDay
61%49%12%10%1
1488
March1st to 15thDay
62%310%15%6%1
1905
16th to endDay
47%48%20%14%5%
2157
April1st to 15thDay
54%46%17%12%2
2152
16th to endDay
50%37%20%15%3
2259
May1st to 15thDay
51%49%16%14%2
2501
16th to endDay
47%6%12%19%11%1
2622
June1st to 15thDay
54%5%11%19%9%
2520
16th to endDay
49%6%10%20%11%1
2520
July1st to 15thDay
41%6%12%27%11%
2371
16th to endDay
44%9%13%22%8%
2487
August1st to 15thDay
47%7%14%19%9%
2366
16th to endDay
43%6%15%25%8%
2369
September1st to 15thDay
44%6%12%25%12%
2160
16th to endDay
42%7%10%29%10%
1854
October1st to 15thDay
55%5%10%18%9%
1650
16th to endDay
64%5%9%14%5%
1708
November1st to 15thDay
50%6%15%18%8%
1482
16th to endDay
65%5%9%12%5%1
1440
December1st to 15thDay
71%6%8%10%2
1440
16th to endDay
68%5%8%11%5%
1536
January1st to 15thNight
69%5%9%10%4
2506
16th to endNight
60%5%9%15%8%
2595
February1st to 15thNight
61%5%12%15%5%
2287
16th to endNight
54%5%10%19%10%
1985
March1st to 15thNight
57%311%19%7%
2052
16th to endNight
45%49%21%16%2
2067
April1st to 15thNight
52%47%19%14%1
1796
16th to endNight
46%6%7%20%16%2
1710
May1st to 15thNight
49%48%19%16%3
1449
16th to endNight
39%9%12%21%14%2
1497
June1st to 15thNight
47%6%13%20%11%
1440
16th to endNight
42%7%13%22%13%
1440
July1st to 15thNight
32%6%13%29%16%1
1360
16th to endNight
33%6%17%27%13%
1418
August1st to 15thNight
36%8%18%25%11%
1568
16th to endNight
32%6%16%33%10%
1821
September1st to 15thNight
40%6%13%27%11%
1800
16th to endNight
38%5%11%36%7%
1851
October1st to 15thNight
50%5%10%20%12%
1980
16th to endNight
61%6%10%14%5%
2164
November1st to 15thNight
52%5%12%17%10%
2373
16th to endNight
62%6%10%16%3
2520
December1st to 15thNight
67%5%11%11%2
2520
16th to endNight
69%48%11%5%
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
35%21%25%11%6%
60
16th to endDay
43%12%31%11%1
79
February1st to 15thDay
34%22%37%32
90
16th to endDay
34%23%29%10%2
147
March1st to 15thDay
26%17%35%15%4
270
16th to endDay
25%20%30%14%7%2
288
April1st to 15thDay
28%24%26%12%7%
270
16th to endDay
27%21%24%16%8%2
270
May1st to 15thDay
32%13%24%17%6%5%
288
16th to endDay
22%14%36%16%7%1
331
June1st to 15thDay
27%13%29%18%10%
315
16th to endDay
16%13%36%22%9%2
315
July1st to 15thDay
13%7%34%28%10%4
305
16th to endDay
12%7%38%25%12%3
326
August1st to 15thDay
16%5%33%28%8%7%
313
16th to endDay
17%7%27%26%12%8%
332
September1st to 15thDay
17%11%26%19%14%10%
315
16th to endDay
19%8%28%24%10%8%
266
October1st to 15thDay
27%15%26%20%7%1
255
16th to endDay
34%16%31%12%4
263
November1st to 15thDay
22%13%35%20%7%1
136
16th to endDay
33%11%40%11%3
60
December1st to 15thDay
25%30%31%10%3
60
16th to endDay
40%35%20%3
64
January1st to 15thNight
25%22%33%14%4
720
16th to endNight
21%18%36%19%4
768
February1st to 15thNight
21%20%37%16%3
704
16th to endNight
21%22%35%15%4
631
March1st to 15thNight
25%21%33%17%2
720
16th to endNight
19%19%27%23%8%1
768
April1st to 15thNight
27%18%30%19%4
718
16th to endNight
21%18%28%23%8%
630
May1st to 15thNight
25%9%27%28%7%1
369
16th to endNight
18%8%36%26%9%
375
June1st to 15thNight
20%13%32%25%8%
360
16th to endNight
18%8%31%31%10%
360
July1st to 15thNight
8%7%31%36%14%1
340
16th to endNight
10%332%39%13%
376
August1st to 15thNight
11%425%40%16%1
497
16th to endNight
10%6%30%32%18%1
675
September1st to 15thNight
18%6%30%25%15%3
720
16th to endNight
19%8%25%25%18%2
673
October1st to 15thNight
25%14%27%21%10%
660
16th to endNight
30%15%28%19%5%
704
November1st to 15thNight
22%16%30%20%8%1
700
16th to endNight
31%18%26%16%5%
720
December1st to 15thNight
27%23%29%15%3
720
16th to endNight
33%15%33%14%2
768
Page generated at 2017-09-20 04:49:52. Version ac04

Copyright 2017 A. Danko


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