Taylor Fork
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Taylor Fork clear sky chart from 2005-11-05 to 2017-09-20.

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
40%
15537
13%
46786
10%
15499
43%
15499
20%
32578

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
25%
846
7%
2634
5%
844
28%
844
11%
2125
January16th to endNight
33%
768
10%
2550
9%
768
36%
768
13%
1916
February1st to 15thNight
27%
699
7%
2288
5%
698
29%
698
11%
1809
February16th to endNight
26%
632
6%
1987
5%
632
28%
632
10%
1588
March1st to 15thNight
32%
720
7%
2025
5%
720
35%
720
15%
1539
March16th to endNight
32%
768
8%
2112
4%
768
34%
768
16%
1614
April1st to 15thNight
34%
602
9%
1797
5%
602
38%
602
17%
1319
April16th to endNight
36%
540
13%
1620
9%
540
38%
540
20%
1106
May1st to 15thNight
46%
539
12%
1608
9%
539
48%
539
25%
1039
May16th to endNight
39%
562
7%
1498
6%
561
40%
561
17%
1123
June1st to 15thNight
49%
366
10%
1266
9%
366
52%
366
20%
850
June16th to endNight
61%
360
19%
1260
18%
360
68%
360
36%
657
July1st to 15thNight
79%
340
18%
1190
23%
340
81%
340
44%
563
July16th to endNight
66%
491
24%
1486
25%
460
70%
460
48%
691
August1st to 15thNight
68%
539
23%
1611
20%
536
70%
536
42%
846
August16th to endNight
64%
573
30%
1719
25%
573
67%
573
45%
887
September1st to 15thNight
63%
618
24%
1871
20%
618
67%
618
38%
1060
September16th to endNight
61%
675
25%
1869
19%
675
64%
675
38%
1109
October1st to 15thNight
46%
660
20%
1952
14%
660
51%
660
28%
1262
October16th to endNight
43%
704
17%
2163
13%
704
47%
704
25%
1426
November1st to 15thNight
34%
775
13%
2350
10%
775
37%
775
17%
1712
November16th to endNight
29%
900
9%
2520
6%
900
31%
900
17%
1883
December1st to 15thNight
23%
900
4%
2530
3%
900
24%
900
10%
2120
December16th to endNight
21%
960
7%
2880
5%
960
24%
960
10%
2334

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
7%12%5%9%7%35%45%6%33%
48068
Night
5%10%49%7%35%45%6%34%
46954
Cloud CoverDay
7%10%5%9%7%35%45%6%34%
48069
Night
5%8%49%7%45%5%5%7%35%
46956
TransparencyDay
49%7%12%17%10%3
47740
Night
46%8%15%17%9%2
46786
SeeingDay
15%20%31%21%9%2
5898
Night
10%13%29%31%13%1
15547

By Month

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
313%10%13%11%3445%6%22%
1316
16th to endDay
214%8%13%10%3433429%
1671
February1st to 15thDay
316%10%15%10%34345%21%
1575
16th to endDay
216%10%20%11%3334419%
1485
March1st to 15thDay
5%16%7%12%8%45%45%6%21%
1935
16th to endDay
8%19%8%12%8%34446%18%
2111
April1st to 15thDay
7%22%6%11%8%35%445%19%
2149
16th to endDay
10%18%6%10%7%24345%25%
2340
May1st to 15thDay
9%14%5%8%7%35%45%6%29%
2340
16th to endDay
17%16%5%8%7%36%445%19%
2616
June1st to 15thDay
14%11%5%8%6%45%5%5%6%26%
2691
16th to endDay
6%6%26%5%3446%7%46%
2700
July1st to 15thDay
5%3245%35%5%6%8%48%
2700
16th to endDay
43145%35%5%5%6%55%
2577
August1st to 15thDay
6%415%6%35%5%6%6%48%
2340
16th to endDay
5%3145%35%6%5%6%51%
2483
September1st to 15thDay
9%6%25%423345%53%
2087
16th to endDay
10%8%25%424447%46%
1860
October1st to 15thDay
13%13%38%5%25%435%33%
1678
16th to endDay
8%15%5%8%6%24446%33%
1708
November1st to 15thDay
8%12%5%10%6%34445%33%
1494
16th to endDay
413%7%11%9%35%5%4429%
1440
December1st to 15thDay
416%7%15%8%5%7%5%45%18%
1428
16th to endDay
5%14%9%18%11%4344321%
1344
January1st to 15thNight
414%7%13%11%45%5%46%22%
2634
16th to endNight
313%6%12%9%36%447%27%
2550
February1st to 15thNight
315%7%12%11%5%5%446%23%
2277
16th to endNight
313%8%16%10%5%5%5%5%5%19%
1987
March1st to 15thNight
314%6%9%9%37%5%46%27%
2025
16th to endNight
6%14%5%9%8%46%5%5%6%26%
2109
April1st to 15thNight
7%14%7%8%6%35%5%5%7%29%
1797
16th to endNight
8%12%47%6%35%46%8%32%
1620
May1st to 15thNight
6%9%26%5%46%5%6%7%38%
1607
16th to endNight
13%12%37%6%35%47%8%27%
1498
June1st to 15thNight
11%7%36%7%345%6%9%33%
1266
16th to endNight
5%5%245%3445%8%53%
1260
July1st to 15thNight
2213325%47%10%55%
1260
16th to endNight
2213425%46%5%61%
1590
August1st to 15thNight
3113435%6%7%8%54%
1620
16th to endNight
431442345%7%58%
1719
September1st to 15thNight
8%5%145%23346%54%
1871
16th to endNight
8%5%2441345%6%53%
1869
October1st to 15thNight
9%10%36%433346%43%
1952
16th to endNight
7%9%38%6%35%446%40%
2163
November1st to 15thNight
7%11%49%8%35%446%32%
2350
16th to endNight
412%5%10%8%5%6%446%30%
2520
December1st to 15thNight
416%7%14%10%45%5%5%5%19%
2530
16th to endNight
5%14%8%15%10%5%5%5%5%6%19%
2880

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
210%8%12%11%5%7%5%5%6%23%
1316
16th to endDay
111%8%13%10%36%5%45%29%
1671
February1st to 15thDay
114%10%15%10%35%5%46%22%
1575
16th to endDay
213%11%19%10%45%335%20%
1485
March1st to 15thDay
314%6%11%9%47%6%5%7%22%
1935
16th to endDay
7%18%8%11%8%45%445%20%
2112
April1st to 15thDay
6%20%8%11%7%345%5%6%20%
2149
16th to endDay
9%18%6%9%7%34345%26%
2340
May1st to 15thDay
9%13%5%8%7%45%45%6%29%
2340
16th to endDay
17%14%5%9%7%36%445%19%
2616
June1st to 15thDay
14%10%48%6%46%5%5%6%27%
2691
16th to endDay
6%5%25%6%3445%7%47%
2700
July1st to 15thDay
4325%435%5%6%9%49%
2700
16th to endDay
42145%35%45%6%56%
2577
August1st to 15thDay
6%425%6%4446%7%47%
2340
16th to endDay
6%2146%245%5%6%52%
2483
September1st to 15thDay
8%6%24323345%54%
2087
16th to endDay
9%8%24433446%47%
1860
October1st to 15thDay
12%12%47%6%3445%5%33%
1678
16th to endDay
7%13%49%5%3445%6%34%
1708
November1st to 15thDay
7%12%6%9%5%335%5%6%33%
1494
16th to endDay
211%7%11%9%46%5%5%5%30%
1440
December1st to 15thDay
212%8%15%9%5%8%6%6%6%18%
1428
16th to endDay
311%9%18%11%45%445%21%
1344
January1st to 15thNight
311%6%15%11%5%6%6%5%6%23%
2634
16th to endNight
28%7%12%9%5%6%5%5%8%28%
2550
February1st to 15thNight
112%5%12%10%5%6%6%5%5%25%
2277
16th to endNight
210%8%15%10%6%7%5%46%21%
1987
March1st to 15thNight
111%6%10%8%48%6%5%8%28%
2025
16th to endNight
5%13%49%7%46%5%6%8%28%
2112
April1st to 15thNight
7%13%5%9%6%4346%7%31%
1797
16th to endNight
7%10%37%6%45%46%7%34%
1620
May1st to 15thNight
6%9%16%6%45%5%6%7%39%
1607
16th to endNight
14%10%37%7%36%5%5%8%27%
1497
June1st to 15thNight
11%6%26%6%346%7%9%34%
1266
16th to endNight
5%314435%45%8%54%
1260
July1st to 15thNight
31333447%10%56%
1260
16th to endNight
2135%25%5%5%7%60%
1590
August1st to 15thNight
3114425%6%7%8%54%
1620
16th to endNight
421442345%7%58%
1719
September1st to 15thNight
7%425%424446%55%
1871
16th to endNight
7%5%24323447%54%
1869
October1st to 15thNight
8%9%45%5%23445%44%
1952
16th to endNight
5%8%36%6%36%45%7%41%
2163
November1st to 15thNight
6%9%5%9%7%46%5%5%6%32%
2350
16th to endNight
39%5%8%9%47%6%5%7%31%
2520
December1st to 15thNight
312%6%15%11%5%7%5%6%5%19%
2530
16th to endNight
411%7%15%11%5%6%6%5%5%20%
2880

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
61%10%11%10%41
1316
16th to endDay
57%9%13%12%6%1
1671
February1st to 15thDay
62%9%12%12%2
1575
16th to endDay
68%6%9%10%21
1485
March1st to 15thDay
59%9%14%11%4
1935
16th to endDay
65%7%13%11%1
2112
April1st to 15thDay
63%7%12%13%3
2149
16th to endDay
58%7%13%15%4
2340
May1st to 15thDay
52%7%14%20%5%
2340
16th to endDay
64%7%13%10%3
2620
June1st to 15thDay
54%8%13%17%5%
2691
16th to endDay
33%6%10%24%19%4
2700
July1st to 15thDay
28%5%11%23%22%8%
2541
16th to endDay
25%39%15%27%18%
2418
August1st to 15thDay
31%5%9%20%24%8%
2325
16th to endDay
28%5%10%25%22%8%
2483
September1st to 15thDay
31%48%21%26%6%
2087
16th to endDay
36%5%12%26%16%3
1860
October1st to 15thDay
50%6%15%19%7%
1678
16th to endDay
49%7%16%20%5%
1708
November1st to 15thDay
51%10%14%16%5%1
1494
16th to endDay
54%8%16%13%5%1
1440
December1st to 15thDay
65%9%10%11%2
1428
16th to endDay
66%8%11%9%3
1344
January1st to 15thNight
61%9%11%10%41
2634
16th to endNight
54%9%14%13%42
2550
February1st to 15thNight
60%9%12%12%4
2288
16th to endNight
63%7%13%11%21
1987
March1st to 15thNight
51%11%16%15%4
2025
16th to endNight
51%10%18%14%3
2112
April1st to 15thNight
50%9%19%16%4
1797
16th to endNight
45%7%20%21%4
1620
May1st to 15thNight
38%8%19%26%6%
1608
16th to endNight
51%9%18%14%6%
1498
June1st to 15thNight
42%10%18%21%5%
1266
16th to endNight
27%5%14%26%20%6%
1260
July1st to 15thNight
20%5%18%25%21%8%
1190
16th to endNight
18%410%18%29%16%
1486
August1st to 15thNight
22%7%13%21%25%8%
1611
16th to endNight
23%311%25%26%9%
1719
September1st to 15thNight
28%5%9%23%24%7%
1871
16th to endNight
29%6%15%28%16%3
1869
October1st to 15thNight
39%6%17%25%10%
1952
16th to endNight
40%8%17%24%9%
2163
November1st to 15thNight
50%8%15%17%6%2
2350
16th to endNight
50%9%17%12%6%1
2520
December1st to 15thNight
65%9%12%9%2
2530
16th to endNight
64%6%12%11%21
2880

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
115%36%28%16%1
60
16th to endDay
11%12%43%22%8%1
87
February1st to 15thDay
20%22%28%23%32
90
16th to endDay
18%29%35%12%4
144
March1st to 15thDay
19%41%30%8%
270
16th to endDay
22%35%31%9%1
288
April1st to 15thDay
20%31%30%13%4
269
16th to endDay
25%28%28%14%2
270
May1st to 15thDay
16%25%30%19%6%1
297
16th to endDay
24%11%24%21%14%2
517
June1st to 15thDay
16%18%26%24%11%2
495
16th to endDay
11%17%27%24%16%3
495
July1st to 15thDay
6%10%26%33%20%2
475
16th to endDay
5%15%43%22%11%2
361
August1st to 15thDay
9%15%33%27%11%1
315
16th to endDay
7%14%32%30%11%4
332
September1st to 15thDay
13%17%35%20%10%1
315
16th to endDay
17%18%32%21%7%2
272
October1st to 15thDay
22%18%28%21%7%
118
16th to endDay
26%19%30%13%7%3
96
November1st to 15thDay
11%10%33%23%16%5%
90
16th to endDay
6%25%46%17%3
90
December1st to 15thDay
19%23%27%27%2
88
16th to endDay
14%21%31%21%9%1
64
January1st to 15thNight
9%20%38%25%7%
849
16th to endNight
8%14%38%26%10%1
768
February1st to 15thNight
8%20%34%28%7%
704
16th to endNight
8%20%36%28%6%
632
March1st to 15thNight
9%19%32%30%7%1
720
16th to endNight
13%17%30%30%7%
768
April1st to 15thNight
13%16%28%29%10%1
602
16th to endNight
14%12%30%27%13%
540
May1st to 15thNight
12%10%25%32%17%1
540
16th to endNight
18%9%23%31%15%1
563
June1st to 15thNight
13%5%24%37%17%
366
16th to endNight
7%5%20%43%22%1
360
July1st to 15thNight
3210%48%32%2
340
16th to endNight
3220%43%26%2
491
August1st to 15thNight
5%217%42%30%2
539
16th to endNight
5%320%38%29%1
573
September1st to 15thNight
8%320%37%26%4
618
16th to endNight
11%5%18%34%25%4
675
October1st to 15thNight
14%6%26%35%15%1
660
16th to endNight
10%10%30%30%13%4
704
November1st to 15thNight
13%17%30%29%8%
775
16th to endNight
9%23%34%25%6%
900
December1st to 15thNight
11%16%40%24%5%1
900
16th to endNight
10%19%38%24%7%
960
Page generated at 2017-09-21 05:18:21. Version ac04

Copyright 2017 A. Danko


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