Tyler Bend Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tyler Bend Campground 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
44%
15724
24%
47005
15%
15677
52%
15677
30%
28032

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
23%
900
27%
2327
8%
895
36%
895
26%
1492
January16th to endNight
25%
960
27%
2496
9%
960
37%
960
31%
1555
February1st to 15thNight
24%
880
19%
2288
5%
876
32%
876
27%
1490
February16th to endNight
22%
614
25%
1876
7%
614
38%
614
25%
1111
March1st to 15thNight
30%
540
21%
1980
13%
540
40%
540
19%
1246
March16th to endNight
30%
576
17%
2112
15%
576
37%
576
20%
1342
April1st to 15thNight
29%
539
23%
1803
11%
539
45%
539
26%
1032
April16th to endNight
32%
540
22%
1800
14%
540
46%
540
27%
1082
May1st to 15thNight
44%
539
19%
1704
14%
539
52%
539
27%
1058
May16th to endNight
51%
563
19%
1651
15%
561
57%
561
32%
1017
June1st to 15thNight
69%
540
25%
1440
20%
540
73%
540
48%
799
June16th to endNight
69%
540
26%
1469
20%
540
74%
540
47%
795
July1st to 15thNight
71%
510
17%
1530
17%
510
72%
510
35%
890
July16th to endNight
81%
564
26%
1594
27%
531
83%
531
41%
865
August1st to 15thNight
77%
539
22%
1628
25%
536
78%
536
39%
902
August16th to endNight
74%
573
23%
1910
27%
573
76%
573
34%
1067
September1st to 15thNight
66%
540
26%
1800
27%
540
69%
540
31%
1040
September16th to endNight
64%
551
30%
1854
27%
551
69%
551
35%
1020
October1st to 15thNight
57%
660
30%
1980
23%
660
63%
660
39%
1087
October16th to endNight
44%
704
33%
2112
20%
704
55%
704
37%
1163
November1st to 15thNight
42%
700
31%
2102
18%
700
55%
700
35%
1166
November16th to endNight
33%
792
25%
2412
14%
792
45%
792
27%
1447
December1st to 15thNight
30%
900
21%
2520
8%
900
41%
900
27%
1603
December16th to endNight
26%
960
23%
2617
8%
960
37%
960
23%
1763

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
10%5%25%5%35%45%7%44%
47793
Night
10%5%2442445%7%50%
47201
TransparencyDay
38%6%11%23%16%3
47493
Night
33%5%11%24%19%4
47006
SeeingDay
12%8%22%27%21%7%
5775
Night
13%10%27%29%16%1
15725

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 15thDay
15%5%13323335%50%
1611
16th to endDay
10%5%35%5%23346%49%
1728
February1st to 15thDay
12%8%35%424325%47%
1575
16th to endDay
11%8%35%42345%5%43%
1605
March1st to 15thDay
15%7%24425%345%43%
1980
16th to endDay
15%8%25%5%2444440%
2110
April1st to 15thDay
9%6%26%42445%5%45%
2145
16th to endDay
15%7%35%5%35%5%5%6%38%
2160
May1st to 15thDay
15%5%25%6%3445%6%39%
2244
16th to endDay
10%6%36%8%35%448%37%
2460
June1st to 15thDay
6%325%6%36%5%6%8%44%
2520
16th to endDay
5%3245%45%6%7%8%44%
2486
July1st to 15thDay
6%5%36%7%46%7%7%9%34%
2340
16th to endDay
5%3145%46%6%8%10%42%
2466
August1st to 15thDay
8%4146%36%6%7%9%40%
2322
16th to endDay
6%425%6%37%6%7%9%40%
2292
September1st to 15thDay
13%424425%447%44%
2160
16th to endDay
11%5%135%2445%6%47%
1837
October1st to 15thDay
11%4245%23445%52%
1650
16th to endDay
13%41231233457%
1760
November1st to 15thDay
9%323323346%56%
1755
16th to endDay
12%7%14324445%48%
1545
December1st to 15thDay
12%7%34433346%46%
1440
16th to endDay
11%10%345%2435%5%43%
1602
January1st to 15thNight
11%6%25%5%2233450%
2327
16th to endNight
10%6%34323245%53%
2496
February1st to 15thNight
12%6%25%434346%47%
2278
16th to endNight
10%6%1442345%6%50%
1876
March1st to 15thNight
15%6%45%324346%42%
1980
16th to endNight
15%6%345%24446%41%
2112
April1st to 15thNight
8%4245%33447%51%
1803
16th to endNight
11%5%244235%6%6%47%
1800
May1st to 15thNight
12%3143245%6%7%46%
1703
16th to endNight
8%4234245%6%10%47%
1650
June1st to 15thNight
421321345%10%58%
1440
16th to endNight
431232345%10%57%
1469
July1st to 15thNight
4324435%5%7%10%48%
1620
16th to endNight
421332436%9%57%
1702
August1st to 15thNight
5%2233245%7%10%50%
1638
16th to endNight
33245%35%47%11%49%
1910
September1st to 15thNight
9%5%24325%45%6%51%
1800
16th to endNight
8%5%14423447%54%
1854
October1st to 15thNight
9%413223346%56%
1980
16th to endNight
12%31332323360%
2112
November1st to 15thNight
8%32232335%6%57%
2102
16th to endNight
13%5%24324245%50%
2412
December1st to 15thNight
14%6%24424347%46%
2520
16th to endNight
12%8%35%434345%43%
2617

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
36%48%25%20%4
1612
16th to endDay
37%39%26%19%3
1728
February1st to 15thDay
41%411%23%15%3
1576
16th to endDay
42%5%10%22%16%3
1605
March1st to 15thDay
44%49%19%15%6%
1980
16th to endDay
47%411%22%12%1
2112
April1st to 15thDay
38%6%11%22%18%2
2145
16th to endDay
45%7%9%18%15%3
2160
May1st to 15thDay
46%6%12%17%16%1
2244
16th to endDay
44%7%12%23%10%1
2464
June1st to 15thDay
35%8%13%24%17%
2520
16th to endDay
33%7%16%25%14%2
2486
July1st to 15thDay
41%9%13%23%10%1
2201
16th to endDay
31%10%16%27%12%1
2311
August1st to 15thDay
36%9%14%24%14%1
2308
16th to endDay
36%9%16%19%13%4
2292
September1st to 15thDay
38%6%10%22%17%6%
2160
16th to endDay
35%6%8%24%22%3
1837
October1st to 15thDay
33%6%8%24%21%6%
1650
16th to endDay
31%37%27%23%7%
1760
November1st to 15thDay
29%48%27%21%8%
1755
16th to endDay
37%5%8%21%24%3
1545
December1st to 15thDay
39%411%22%18%3
1440
16th to endDay
42%5%10%21%17%3
1602
January1st to 15thNight
37%47%23%23%3
2327
16th to endNight
35%310%25%21%4
2496
February1st to 15thNight
39%411%24%16%4
2288
16th to endNight
34%5%11%26%16%5%
1876
March1st to 15thNight
44%49%18%18%5%
1980
16th to endNight
44%5%10%22%15%1
2112
April1st to 15thNight
33%5%12%22%21%5%
1803
16th to endNight
35%6%11%26%17%2
1800
May1st to 15thNight
35%8%13%20%18%3
1704
16th to endNight
32%8%19%23%13%2
1652
June1st to 15thNight
21%6%14%34%21%2
1440
16th to endNight
21%6%16%27%22%4
1469
July1st to 15thNight
27%9%15%27%16%1
1530
16th to endNight
22%8%15%33%17%2
1594
August1st to 15thNight
25%7%18%27%18%2
1628
16th to endNight
27%9%17%24%17%4
1910
September1st to 15thNight
33%6%8%26%17%8%
1800
16th to endNight
28%6%9%22%26%6%
1854
October1st to 15thNight
28%413%23%23%7%
1980
16th to endNight
29%26%24%27%9%
2112
November1st to 15thNight
28%49%24%24%8%
2102
16th to endNight
35%48%22%24%4
2412
December1st to 15thNight
38%5%12%21%17%4
2520
16th to endNight
43%5%9%20%17%3
2617

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
24%21%32%18%3
90
16th to endDay
18%35%32%9%4
96
February1st to 15thDay
16%18%50%12%11
90
16th to endDay
19%24%37%13%4
81
March1st to 15thDay
28%21%36%13%
90
16th to endDay
14%31%25%25%4
96
April1st to 15thDay
13%19%34%20%11%
264
16th to endDay
22%13%32%21%8%1
270
May1st to 15thDay
15%14%34%21%12%2
381
16th to endDay
13%6%36%25%12%4
517
June1st to 15thDay
9%317%37%22%9%
495
16th to endDay
6%224%34%24%6%
495
July1st to 15thDay
8%218%37%25%8%
475
16th to endDay
5%15%27%40%20%
515
August1st to 15thDay
10%29%30%35%11%
475
16th to endDay
10%9%31%31%15%
332
September1st to 15thDay
12%410%23%34%14%
315
16th to endDay
14%119%25%30%9%
146
October1st to 15thDay
7%8%27%34%17%3
90
16th to endDay
16%333%36%7%3
96
November1st to 15thDay
10%7%34%26%14%6%
90
16th to endDay
31%28%20%15%4
90
December1st to 15thDay
18%20%25%25%45%
90
16th to endDay
21%20%36%18%2
96
January1st to 15thNight
19%20%32%22%4
900
16th to endNight
16%17%37%25%3
960
February1st to 15thNight
18%17%36%23%3
880
16th to endNight
15%20%38%22%2
614
March1st to 15thNight
19%14%32%30%2
540
16th to endNight
18%12%34%27%7%
576
April1st to 15thNight
10%19%37%25%6%
539
16th to endNight
12%11%39%27%7%
540
May1st to 15thNight
14%8%31%34%10%
540
16th to endNight
10%5%27%32%22%2
563
June1st to 15thNight
5%218%40%32%1
540
16th to endNight
5%118%39%31%4
540
July1st to 15thNight
5%111%42%35%2
510
16th to endNight
4432%47%9%
564
August1st to 15thNight
7%7%33%42%8%
539
16th to endNight
5%11%35%40%5%
573
September1st to 15thNight
12%210%27%43%4
540
16th to endNight
10%315%31%32%5%
551
October1st to 15thNight
12%422%30%25%3
660
16th to endNight
14%10%27%32%14%
704
November1st to 15thNight
11%12%30%30%14%
700
16th to endNight
19%14%30%26%8%
792
December1st to 15thNight
19%13%33%26%6%
900
16th to endNight
18%17%33%26%4
960
Page generated at 2017-09-20 03:49:55. Version ac04

Copyright 2017 A. Danko


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