Forest Road 006 Site 1
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Forest Road 006 Site 1 clear sky chart from 2005-11-05 to 2018-01-12.

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
61%
16001
24%
48371
21%
15964
64%
15964
34%
28062

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
60%
760
16%
2471
16%
760
62%
760
25%
1570
January16th to endNight
59%
768
21%
2496
22%
768
61%
768
25%
1586
February1st to 15thNight
57%
698
15%
2273
17%
698
59%
698
25%
1444
February16th to endNight
52%
632
21%
1895
20%
632
56%
632
28%
1202
March1st to 15thNight
57%
720
21%
2031
19%
720
61%
720
33%
1245
March16th to endNight
52%
768
21%
2112
15%
768
56%
768
31%
1316
April1st to 15thNight
45%
671
19%
1874
12%
671
50%
671
29%
1166
April16th to endNight
47%
540
25%
1620
17%
540
54%
540
31%
967
May1st to 15thNight
54%
539
21%
1620
16%
539
57%
539
33%
948
May16th to endNight
58%
562
19%
1685
18%
561
60%
561
33%
986
June1st to 15thNight
59%
540
22%
1620
20%
540
63%
540
42%
838
June16th to endNight
65%
540
27%
1620
23%
540
73%
540
57%
739
July1st to 15thNight
70%
510
18%
1530
16%
510
73%
510
39%
850
July16th to endNight
69%
564
21%
1593
20%
531
69%
531
37%
901
August1st to 15thNight
65%
539
26%
1611
19%
536
69%
536
43%
862
August16th to endNight
75%
574
36%
1720
30%
574
77%
574
47%
871
September1st to 15thNight
75%
720
30%
1980
22%
720
79%
720
51%
1026
September16th to endNight
74%
716
38%
1980
31%
716
78%
716
53%
1006
October1st to 15thNight
68%
720
30%
2077
24%
720
72%
720
45%
1104
October16th to endNight
68%
768
34%
2319
30%
768
72%
768
45%
1200
November1st to 15thNight
64%
760
26%
2470
26%
760
66%
760
34%
1386
November16th to endNight
59%
780
26%
2535
25%
780
63%
780
34%
1412
December1st to 15thNight
60%
780
18%
2535
18%
780
61%
780
27%
1546
December16th to endNight
47%
832
17%
2704
16%
832
50%
832
18%
1891

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
45%25%5%3445%7%50%
48967
Night
46%25%5%3445%7%50%
48565
TransparencyDay
31%5%11%18%19%13%
48662
Night
31%5%11%21%19%11%
48371
SeeingDay
7%13%26%29%18%4
5723
Night
7%6%17%36%27%5%
16013

By Month

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
39%38%7%36%45%8%38%
1710
16th to endDay
5%8%47%6%3446%8%40%
1728
February1st to 15thDay
410%49%6%46%5%47%37%
1588
16th to endDay
49%47%6%345%6%8%39%
1579
March1st to 15thDay
37%35%6%35%5%5%7%46%
1928
16th to endDay
6%8%37%7%445%5%6%38%
2112
April1st to 15thDay
5%8%46%7%35%446%43%
2071
16th to endDay
5%8%25%5%3445%6%48%
2340
May1st to 15thDay
6%6%245%25%45%7%48%
2331
16th to endDay
5%5%26%6%35%5%6%6%45%
2429
June1st to 15thDay
43245%2446%6%55%
2340
16th to endDay
211221233473%
2340
July1st to 15thDay
33135%35%45%7%56%
2340
16th to endDay
4324435%5%6%6%52%
2467
August1st to 15thDay
23235%346%6%7%54%
2340
16th to endDay
32144235%5%7%59%
2480
September1st to 15thDay
3314313446%62%
1980
16th to endDay
3213212346%66%
1980
October1st to 15thDay
6%42442445%5%54%
1881
16th to endDay
431442445%7%57%
1902
November1st to 15thDay
5%6%146%4445%7%48%
1719
16th to endDay
47%25%435%5%6%7%47%
1755
December1st to 15thDay
38%38%7%35%5%5%7%42%
1755
16th to endDay
7%12%5%9%8%3445%7%31%
1872
January1st to 15thNight
39%46%5%445%5%7%42%
2471
16th to endNight
5%9%36%6%3445%8%42%
2496
February1st to 15thNight
47%36%6%36%5%6%8%40%
2262
16th to endNight
37%37%7%35%5%5%7%43%
1895
March1st to 15thNight
36%36%5%35%6%6%7%44%
2031
16th to endNight
5%6%346%46%5%6%7%42%
2112
April1st to 15thNight
6%7%35%5%35%447%46%
1874
16th to endNight
6%7%24435%36%6%48%
1620
May1st to 15thNight
5%5%245%346%6%7%48%
1619
16th to endNight
5%6%35%5%235%6%6%48%
1684
June1st to 15thNight
5%324424447%58%
1620
16th to endNight
1212312445%69%
1620
July1st to 15thNight
43245%45%6%5%6%51%
1620
16th to endNight
4315%5%36%5%6%7%50%
1701
August1st to 15thNight
33243346%6%8%51%
1620
16th to endNight
231333445%7%59%
1720
September1st to 15thNight
3313323346%63%
1980
16th to endNight
4312222235%69%
1980
October1st to 15thNight
4315%323346%60%
2077
16th to endNight
23143245%6%8%57%
2319
November1st to 15thNight
46%244245%5%6%52%
2470
16th to endNight
35%35%5%2445%7%51%
2535
December1st to 15thNight
5%7%26%5%34447%45%
2535
16th to endNight
7%11%49%8%3445%6%33%
2704

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
41%9%20%19%7%
1711
16th to endDay
43%8%17%17%10%2
1728
February1st to 15thDay
45%7%15%19%10%1
1588
16th to endDay
38%7%17%24%11%
1579
March1st to 15thDay
34%5%16%25%14%3
1928
16th to endDay
42%6%12%23%10%4
2112
April1st to 15thDay
38%5%11%20%18%4
2071
16th to endDay
33%49%22%23%5%
2340
May1st to 15thDay
31%49%18%26%8%
2331
16th to endDay
33%6%9%18%24%7%
2432
June1st to 15thDay
25%46%13%31%17%
2340
16th to endDay
15%139%25%45%
2340
July1st to 15thDay
23%47%12%18%33%
2201
16th to endDay
26%48%12%18%27%
2312
August1st to 15thDay
24%48%15%17%30%
2325
16th to endDay
22%36%14%26%26%
2480
September1st to 15thDay
21%37%12%25%28%
1980
16th to endDay
17%36%20%30%21%
1980
October1st to 15thDay
29%47%20%29%7%
1881
16th to endDay
24%410%28%28%4
1902
November1st to 15thDay
32%5%12%25%18%5%
1719
16th to endDay
32%6%15%27%15%2
1755
December1st to 15thDay
42%5%19%24%8%
1755
16th to endDay
51%7%16%15%8%
1872
January1st to 15thNight
38%8%19%21%10%1
2471
16th to endNight
39%7%15%22%12%3
2496
February1st to 15thNight
39%7%16%22%12%1
2273
16th to endNight
37%7%12%28%12%1
1895
March1st to 15thNight
34%5%14%27%15%3
2031
16th to endNight
35%5%13%24%16%4
2112
April1st to 15thNight
36%411%22%20%4
1874
16th to endNight
34%410%25%20%4
1620
May1st to 15thNight
31%6%9%19%25%8%
1620
16th to endNight
31%6%11%22%21%7%
1685
June1st to 15thNight
24%36%16%30%18%
1620
16th to endNight
15%348%25%42%
1620
July1st to 15thNight
27%5%7%10%15%33%
1530
16th to endNight
30%5%8%12%16%27%
1593
August1st to 15thNight
25%5%11%15%16%26%
1611
16th to endNight
21%46%15%25%26%
1720
September1st to 15thNight
20%37%14%23%29%
1980
16th to endNight
19%2417%30%24%
1980
October1st to 15thNight
24%39%21%30%10%
2077
16th to endNight
22%5%9%24%32%5%
2319
November1st to 15thNight
31%410%25%20%7%
2470
16th to endNight
31%414%28%18%3
2535
December1st to 15thNight
36%7%16%27%11%1
2535
16th to endNight
48%7%14%19%8%
2704

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
22%214%30%25%4
123
16th to endDay
13%7%15%29%26%8%
96
February1st to 15thDay
8%8%22%24%29%6%
103
16th to endDay
11%16%34%25%10%2
238
March1st to 15thDay
8%18%27%28%15%2
270
16th to endDay
13%24%30%20%9%
288
April1st to 15thDay
10%29%23%21%12%2
269
16th to endDay
13%27%27%21%9%
270
May1st to 15thDay
8%18%34%27%8%2
288
16th to endDay
10%13%24%28%18%4
330
June1st to 15thDay
316%32%29%15%2
315
16th to endDay
27%31%33%18%6%
315
July1st to 15thDay
5%428%31%23%6%
305
16th to endDay
5%325%42%20%2
327
August1st to 15thDay
5%430%39%16%3
315
16th to endDay
4324%34%25%7%
332
September1st to 15thDay
5%9%29%28%18%8%
315
16th to endDay
7%12%20%27%26%6%
315
October1st to 15thDay
6%12%35%23%17%5%
216
16th to endDay
6%14%18%27%29%4
144
November1st to 15thDay
212%19%35%17%12%
135
16th to endDay
5%17%22%29%22%2
135
December1st to 15thDay
6%13%22%33%19%5%
135
16th to endDay
7%9%21%37%22%1
144
January1st to 15thNight
9%5%14%35%27%6%
764
16th to endNight
10%5%16%31%27%8%
768
February1st to 15thNight
7%5%19%38%24%4
704
16th to endNight
9%6%21%40%19%2
632
March1st to 15thNight
7%8%17%43%20%3
720
16th to endNight
7%11%22%37%18%2
768
April1st to 15thNight
10%15%23%29%18%2
671
16th to endNight
10%12%23%32%17%2
540
May1st to 15thNight
8%7%23%36%22%2
540
16th to endNight
9%8%15%33%28%3
563
June1st to 15thNight
5%9%18%39%25%1
540
16th to endNight
3323%35%32%2
540
July1st to 15thNight
5%310%37%38%4
510
16th to endNight
6%14%35%39%3
564
August1st to 15thNight
6%119%42%28%1
539
16th to endNight
4112%38%37%5%
574
September1st to 15thNight
4311%34%36%9%
720
16th to endNight
6%5%10%28%36%11%
716
October1st to 15thNight
6%415%37%28%6%
720
16th to endNight
46%15%32%33%7%
768
November1st to 15thNight
8%6%14%36%26%7%
760
16th to endNight
5%7%18%34%25%7%
780
December1st to 15thNight
10%6%15%41%22%3
780
16th to endNight
13%7%18%38%21%2
832
Page generated at 2018-01-12 20:01:33. Version ac04

Copyright 2018 A. Danko


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