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 2018-11-30.

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%
16187
13%
51726
7%
16157
33%
16157
16%
36799

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
13%
780
6%
2716
2%
776
19%
776
7%
2193
January16th to endNight
17%
832
11%
2811
5%
832
24%
832
10%
2144
February1st to 15thNight
12%
762
10%
2482
3%
761
22%
761
10%
1905
February16th to endNight
16%
683
13%
2149
4%
683
27%
683
12%
1569
March1st to 15thNight
14%
780
12%
2222
5%
780
22%
780
12%
1683
March16th to endNight
28%
832
21%
2239
9%
832
38%
832
22%
1532
April1st to 15thNight
19%
778
16%
1946
5%
778
26%
778
18%
1449
April16th to endNight
30%
674
17%
1830
8%
674
37%
674
21%
1277
May1st to 15thNight
32%
400
19%
1570
15%
400
44%
400
18%
1003
May16th to endNight
31%
407
15%
1625
10%
406
45%
406
19%
983
June1st to 15thNight
30%
390
10%
1560
8%
390
41%
390
16%
1003
June16th to endNight
36%
390
10%
1560
12%
390
43%
390
19%
969
July1st to 15thNight
45%
370
17%
1480
20%
370
54%
370
29%
790
July16th to endNight
47%
408
14%
1546
13%
386
54%
386
27%
866
August1st to 15thNight
48%
529
14%
1670
10%
527
53%
527
26%
1054
August16th to endNight
47%
731
20%
1973
9%
731
53%
731
35%
1226
September1st to 15thNight
42%
780
18%
1950
8%
780
45%
780
30%
1322
September16th to endNight
43%
777
22%
2140
14%
777
48%
777
30%
1368
October1st to 15thNight
27%
780
15%
2340
9%
780
36%
780
18%
1648
October16th to endNight
18%
832
12%
2558
4%
832
28%
832
11%
1977
November1st to 15thNight
23%
820
16%
2779
11%
820
32%
820
14%
1995
November16th to endNight
17%
840
10%
2938
6%
840
22%
840
9%
2289
December1st to 15thNight
14%
780
7%
2730
2%
780
20%
780
7%
2202
December16th to endNight
10%
832
9%
2912
3%
832
19%
832
7%
2352

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%10%47%6%34446%30%
52583
Night
15%10%47%6%34446%32%
51897
TransparencyDay
53%5%10%18%10%1
52271
Night
51%5%11%19%10%
51727
SeeingDay
24%15%31%18%7%2
6888
Night
22%15%31%22%8%
16189

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%7%35%44420%
1552
16th to endDay
13%16%5%10%9%44446%19%
1762
February1st to 15thDay
11%16%5%12%9%45%445%20%
1710
16th to endDay
17%15%5%8%5%3444424%
1610
March1st to 15thDay
15%14%5%9%9%35%33424%
2053
16th to endDay
12%9%47%6%34345%38%
2337
April1st to 15thDay
21%13%45%5%33335%30%
2332
16th to endDay
21%8%45%42332438%
2415
May1st to 15thDay
19%9%36%424446%33%
2710
16th to endDay
15%7%36%6%25%45%7%35%
2842
June1st to 15thDay
21%7%36%6%3435%6%30%
2730
16th to endDay
16%6%26%5%35%5%5%8%32%
2730
July1st to 15thDay
11%6%36%5%35%5%6%9%37%
2730
16th to endDay
11%5%26%6%46%6%6%9%33%
2878
August1st to 15thDay
12%8%37%7%45%45%7%32%
2530
16th to endDay
13%6%26%6%45%5%5%8%35%
2568
September1st to 15thDay
16%7%36%43345%7%38%
2340
16th to endDay
15%6%25%5%33446%41%
2149
October1st to 15thDay
21%11%36%5%34446%29%
1950
16th to endDay
24%13%47%6%3343422%
2018
November1st to 15thDay
17%12%36%6%245%36%31%
1736
16th to endDay
21%14%6%7%7%35%445%19%
1677
December1st to 15thDay
18%18%7%10%8%45%43415%
1560
16th to endDay
19%18%7%10%6%3434419%
1664
January1st to 15thNight
16%13%5%11%8%46%445%16%
2716
16th to endNight
12%15%5%9%9%35%45%5%23%
2811
February1st to 15thNight
12%14%7%9%8%44445%23%
2480
16th to endNight
13%11%5%8%7%4445%6%28%
2149
March1st to 15thNight
16%14%6%8%6%3434428%
2211
16th to endNight
12%8%46%6%33346%39%
2239
April1st to 15thNight
20%10%45%434345%33%
1946
16th to endNight
18%7%35%433447%37%
1830
May1st to 15thNight
18%8%35%433436%38%
1570
16th to endNight
13%6%244245%6%8%40%
1623
June1st to 15thNight
17%6%36%5%25%45%7%36%
1560
16th to endNight
14%5%25%435%5%5%8%39%
1560
July1st to 15thNight
7%325%5%25%45%7%49%
1560
16th to endNight
9%4245%335%6%8%46%
1642
August1st to 15thNight
8%5%26%6%345%6%8%42%
1680
16th to endNight
8%5%25%42445%8%48%
1973
September1st to 15thNight
14%6%234345%5%7%43%
1950
16th to endNight
14%6%24323446%47%
2140
October1st to 15thNight
20%7%36%5%23445%35%
2340
16th to endNight
21%12%46%6%34336%25%
2558
November1st to 15thNight
16%10%47%5%35%445%30%
2779
16th to endNight
20%14%5%8%7%24345%22%
2938
December1st to 15thNight
17%17%7%10%6%34445%18%
2730
16th to endNight
20%15%6%11%7%45%33418%
2912

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%11%7%1
1553
16th to endDay
64%5%8%11%7%1
1762
February1st to 15thDay
65%410%14%5%
1712
16th to endDay
61%49%12%10%1
1610
March1st to 15thDay
63%310%14%6%1
2064
16th to endDay
47%38%20%14%5%
2337
April1st to 15thDay
56%46%16%12%2
2332
16th to endDay
50%37%19%16%3
2415
May1st to 15thDay
50%49%17%15%2
2710
16th to endDay
45%6%12%20%12%2
2846
June1st to 15thDay
54%5%10%18%11%
2730
16th to endDay
48%6%10%20%12%1
2730
July1st to 15thDay
39%5%12%28%13%1
2581
16th to endDay
45%9%13%22%9%
2711
August1st to 15thDay
48%8%14%19%9%
2516
16th to endDay
44%6%15%25%8%
2568
September1st to 15thDay
43%6%12%24%12%
2340
16th to endDay
41%7%11%28%10%
2149
October1st to 15thDay
55%5%10%18%9%
1950
16th to endDay
63%6%9%14%5%
2018
November1st to 15thDay
53%6%14%16%8%
1736
16th to endDay
65%5%9%11%6%1
1677
December1st to 15thDay
71%6%8%10%3
1560
16th to endDay
67%5%8%12%5%
1664
January1st to 15thNight
67%5%9%11%5%
2716
16th to endNight
60%5%9%15%8%
2811
February1st to 15thNight
61%5%12%15%5%
2482
16th to endNight
55%410%18%10%
2149
March1st to 15thNight
59%310%18%7%
2223
16th to endNight
44%49%22%16%2
2239
April1st to 15thNight
52%47%20%13%1
1946
16th to endNight
46%5%7%20%17%2
1830
May1st to 15thNight
46%48%20%16%2
1570
16th to endNight
38%9%12%21%16%2
1625
June1st to 15thNight
45%5%14%21%12%1
1560
16th to endNight
41%7%13%23%13%
1560
July1st to 15thNight
31%5%13%28%19%1
1480
16th to endNight
33%6%16%28%13%
1546
August1st to 15thNight
37%8%17%24%10%
1670
16th to endNight
33%6%16%32%11%
1973
September1st to 15thNight
39%7%13%27%11%
1950
16th to endNight
37%5%12%35%8%
2140
October1st to 15thNight
49%6%10%20%12%
2340
16th to endNight
59%6%11%16%5%
2558
November1st to 15thNight
53%5%12%17%9%
2779
16th to endNight
62%6%10%15%4
2938
December1st to 15thNight
66%6%11%11%3
2730
16th to endNight
68%48%11%6%
2912

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
30%24%28%11%5%
90
16th to endDay
36%20%31%11%
119
February1st to 15thDay
32%23%37%42
135
16th to endDay
36%25%28%8%1
191
March1st to 15thDay
30%15%33%16%3
330
16th to endDay
24%20%30%15%6%1
352
April1st to 15thDay
30%23%26%13%6%
330
16th to endDay
28%20%25%15%8%2
319
May1st to 15thDay
29%16%26%16%5%4
348
16th to endDay
20%14%37%17%7%1
395
June1st to 15thDay
27%12%31%19%9%
375
16th to endDay
17%14%34%21%9%1
375
July1st to 15thDay
12%7%34%30%12%3
365
16th to endDay
14%7%37%25%12%2
390
August1st to 15thDay
16%5%35%27%8%6%
358
16th to endDay
17%8%26%26%12%8%
396
September1st to 15thDay
17%11%27%17%15%10%
375
16th to endDay
18%11%27%21%12%7%
374
October1st to 15thDay
25%17%30%17%6%1
375
16th to endDay
32%18%29%14%3
381
November1st to 15thDay
31%16%28%17%5%1
210
16th to endDay
33%19%36%7%1
119
December1st to 15thDay
27%26%31%12%2
90
16th to endDay
34%34%25%5%1
96
January1st to 15thNight
25%22%33%14%4
780
16th to endNight
21%19%35%18%4
832
February1st to 15thNight
21%21%37%16%3
764
16th to endNight
21%22%36%15%4
683
March1st to 15thNight
26%20%33%16%2
780
16th to endNight
19%18%29%23%8%1
832
April1st to 15thNight
28%17%30%19%4
778
16th to endNight
22%17%26%23%9%
674
May1st to 15thNight
24%9%29%27%8%1
400
16th to endNight
17%8%36%27%9%
407
June1st to 15thNight
18%13%32%25%8%
390
16th to endNight
17%8%30%31%12%
390
July1st to 15thNight
7%7%32%37%14%1
370
16th to endNight
10%333%38%13%
408
August1st to 15thNight
11%425%40%17%1
529
16th to endNight
11%5%30%32%17%2
731
September1st to 15thNight
17%6%30%25%16%3
780
16th to endNight
18%9%24%25%17%3
777
October1st to 15thNight
24%13%29%21%9%1
780
16th to endNight
29%15%30%18%5%
832
November1st to 15thNight
24%16%30%19%7%1
820
16th to endNight
32%18%26%17%5%
840
December1st to 15thNight
27%23%30%15%2
780
16th to endNight
32%15%33%15%1
832
Page generated at 2018-12-01 11:35:36. Version ac04

Copyright 2018 A. Danko


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