Waldport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waldport clear sky chart from 2005-11-06 to 2024-03-18.

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
38%
22987
12%
80540
11%
22879
41%
22879
14%
59702

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 10thNight
21%
755
5%
4394
6%
736
24%
736
4%
3788
January11th to 20thNight
29%
759
9%
4283
8%
740
33%
740
6%
3426
January21st to endNight
32%
836
8%
4512
13%
814
36%
814
6%
3796
February1st to 10thNight
29%
760
7%
2470
7%
760
30%
760
8%
2062
February11th to 20thNight
31%
740
10%
2404
8%
740
35%
740
11%
1905
February21st to endNight
26%
628
11%
2011
9%
628
30%
628
9%
1615
March1st to 10thNight
28%
760
9%
2100
7%
760
30%
760
12%
1719
March11th to 20thNight
33%
752
12%
2067
9%
752
36%
752
14%
1650
March21st to endNight
26%
792
6%
2178
5%
792
27%
792
10%
1832
April1st to 10thNight
28%
720
8%
1811
4%
720
30%
720
12%
1518
April11th to 20thNight
33%
664
11%
1732
6%
664
34%
664
14%
1371
April21st to endNight
36%
540
11%
1620
7%
540
39%
540
15%
1228
May1st to 10thNight
39%
504
12%
1584
10%
504
43%
504
18%
1093
May11th to 20thNight
39%
354
10%
1416
12%
354
43%
354
12%
1005
May21st to endNight
34%
389
8%
1552
10%
388
38%
388
11%
1133
June1st to 10thNight
38%
360
6%
1440
7%
360
41%
360
14%
991
June11th to 20thNight
42%
360
9%
1430
14%
360
45%
360
16%
963
June21st to endNight
50%
360
16%
1260
19%
360
55%
360
25%
783
July1st to 10thNight
54%
350
13%
1334
16%
350
58%
350
25%
785
July11th to 20thNight
50%
348
20%
1392
25%
348
59%
348
30%
725
July21st to endNight
58%
501
22%
1590
22%
474
64%
474
37%
823
August1st to 10thNight
57%
537
18%
1602
17%
534
59%
534
31%
950
August11th to 20thNight
63%
534
26%
1602
22%
534
64%
534
37%
886
August21st to endNight
56%
679
27%
1867
18%
679
60%
679
37%
1102
September1st to 10thNight
61%
720
26%
1800
16%
720
64%
720
45%
1071
September11th to 20thNight
57%
720
22%
1876
14%
720
59%
720
33%
1218
September21st to endNight
58%
720
21%
2018
18%
720
60%
720
31%
1275
October1st to 10thNight
47%
720
16%
2160
14%
720
51%
720
25%
1444
October11th to 20thNight
52%
720
20%
2160
22%
720
54%
720
24%
1459
October21st to endNight
38%
792
17%
2376
14%
792
43%
792
18%
1709
November1st to 10thNight
35%
740
12%
2494
12%
740
37%
740
12%
1951
November11th to 20thNight
30%
760
9%
2660
9%
760
33%
760
10%
2084
November21st to endNight
37%
760
10%
2660
9%
760
40%
760
14%
1960
December1st to 10thNight
35%
760
11%
2660
10%
760
38%
760
13%
1993
December11th to 20thNight
25%
759
9%
3206
7%
759
28%
759
7%
2553
December21st to endNight
20%
834
5%
4819
6%
817
22%
817
4%
3836

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
26%10%36%5%34446%30%
78901
Night
28%11%36%5%34345%28%
80892
TransparencyDay
57%211%18%10%3
78611
Night
60%39%16%9%3
80704
SeeingDay
28%12%27%21%9%2
14124
Night
32%6%13%26%19%3
23000

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 10thDay
39%20%5%7%5%2323310%
2539
11th to 20thDay
41%11%36%5%2333420%
2645
21st to endDay
41%11%36%6%4443416%
3146
February1st to 10thDay
35%12%46%7%34446%16%
1710
11th to 20thDay
32%13%37%6%26%5%45%18%
1665
21st to endDay
34%16%37%5%2344418%
1442
March1st to 10thDay
32%14%5%6%6%35%45%6%15%
2076
11th to 20thDay
36%11%36%5%34345%19%
2059
21st to endDay
36%14%47%6%34335%14%
2178
April1st to 10thDay
34%13%47%5%345%46%15%
2147
11th to 20thDay
30%12%47%6%34346%21%
2171
21st to endDay
29%9%35%6%345%5%7%23%
2340
May1st to 10thDay
22%10%47%5%3446%7%30%
2376
11th to 20thDay
26%11%46%5%35%5%5%8%24%
2477
21st to endDay
28%9%36%6%35%45%9%22%
2723
June1st to 10thDay
29%8%35%5%3445%7%28%
2520
11th to 20thDay
25%9%36%435%45%8%28%
2520
21st to endDay
15%7%25%424348%44%
2699
July1st to 10thDay
9%8%3442445%8%48%
2574
11th to 20thDay
14%7%24323347%53%
2520
21st to endDay
7%5%24223348%59%
2632
August1st to 10thDay
9%9%35%5%3335%7%48%
2328
11th to 20thDay
8%6%35%43335%8%53%
2298
21st to endDay
9%6%35%435%36%9%49%
2488
September1st to 10thDay
8%424423347%59%
2160
11th to 20thDay
13%7%36%434448%44%
2081
21st to endDay
19%6%2443445%6%43%
1941
October1st to 10thDay
21%6%36%5%24446%39%
1800
11th to 20thDay
24%8%35%5%44447%34%
1800
21st to endDay
29%10%35%434336%31%
1980
November1st to 10thDay
36%10%37%434445%20%
1584
11th to 20thDay
36%9%35%5%24447%21%
1520
21st to endDay
32%11%46%434445%24%
1520
December1st to 10thDay
30%9%46%5%33345%28%
1520
11th to 20thDay
35%11%37%5%3445%418%
1928
21st to endDay
41%15%46%5%2434413%
2794
January1st to 10thNight
40%17%47%5%3433312%
4406
11th to 20thNight
40%14%36%42323419%
4313
21st to endNight
45%14%35%42333316%
4521
February1st to 10thNight
34%13%47%6%3445%417%
2470
11th to 20thNight
31%12%47%5%3433423%
2402
21st to endNight
35%12%46%5%3433420%
2011
March1st to 10thNight
31%15%46%5%34435%19%
2100
11th to 20thNight
31%11%37%5%34445%23%
2067
21st to endNight
36%14%46%5%3344416%
2178
April1st to 10thNight
33%14%47%5%34335%19%
1811
11th to 20thNight
27%13%46%5%35%5%5%5%23%
1732
21st to endNight
26%13%46%5%3345%7%25%
1620
May1st to 10thNight
22%12%35%5%34336%33%
1584
11th to 20thNight
26%12%37%43445%6%25%
1416
21st to endNight
23%14%46%5%35%448%24%
1552
June1st to 10thNight
22%8%48%6%3446%6%30%
1440
11th to 20thNight
20%11%46%5%3445%8%30%
1430
21st to endNight
14%12%45%424237%42%
1260
July1st to 10thNight
8%12%46%5%24246%45%
1374
11th to 20thNight
11%9%34423346%52%
1440
21st to endNight
5%9%45%5%22347%54%
1683
August1st to 10thNight
7%12%6%6%42335%9%44%
1611
11th to 20thNight
7%9%35%423248%53%
1602
21st to endNight
10%10%2443335%7%50%
1867
September1st to 10thNight
11%6%23323346%57%
1800
11th to 20thNight
13%8%36%5%34446%46%
1876
21st to endNight
17%7%24324448%45%
2018
October1st to 10thNight
18%8%47%5%23345%41%
2160
11th to 20thNight
23%6%35%424447%38%
2160
21st to endNight
27%10%35%424445%32%
2376
November1st to 10thNight
33%10%37%435%446%22%
2494
11th to 20thNight
38%7%36%5%34445%21%
2660
21st to endNight
28%9%35%6%35%445%27%
2660
December1st to 10thNight
30%10%35%5%34445%26%
2660
11th to 20thNight
34%12%46%5%2445%6%19%
3276
21st to endNight
34%15%47%5%3333418%
4862

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 10thDay
82%17%6%31
2539
11th to 20thDay
72%17%11%5%5%
2645
21st to endDay
75%27%8%6%2
3146
February1st to 10thDay
72%29%10%5%2
1710
11th to 20thDay
70%39%9%6%2
1674
21st to endDay
72%28%10%5%2
1442
March1st to 10thDay
72%29%12%5%
2076
11th to 20thDay
69%28%13%7%1
2059
21st to endDay
76%39%10%2
2178
April1st to 10thDay
73%210%11%4
2147
11th to 20thDay
67%210%13%6%2
2174
21st to endDay
62%412%15%6%1
2340
May1st to 10thDay
56%215%18%8%1
2376
11th to 20thDay
59%313%17%6%1
2480
21st to endDay
61%416%17%2
2724
June1st to 10thDay
58%314%21%5%
2520
11th to 20thDay
55%419%18%4
2520
21st to endDay
39%319%26%11%3
2699
July1st to 10thDay
35%214%23%22%4
2505
11th to 20thDay
32%28%28%23%6%
2445
21st to endDay
24%26%33%29%5%
2486
August1st to 10thDay
34%313%31%16%4
2312
11th to 20thDay
30%212%31%21%3
2298
21st to endDay
32%311%32%18%3
2488
September1st to 10thDay
27%210%32%19%10%
2160
11th to 20thDay
40%413%22%16%6%
2081
21st to endDay
42%311%22%17%5%
1941
October1st to 10thDay
48%39%18%18%5%
1800
11th to 20thDay
53%212%17%14%2
1800
21st to endDay
58%28%14%13%3
1980
November1st to 10thDay
68%36%16%6%1
1584
11th to 20thDay
67%39%10%7%4
1520
21st to endDay
64%37%10%9%7%
1520
December1st to 10thDay
61%211%13%11%3
1520
11th to 20thDay
71%211%9%6%
1928
21st to endDay
77%19%8%31
2794
January1st to 10thNight
81%16%7%32
4406
11th to 20thNight
73%17%10%5%4
4313
21st to endNight
77%25%7%7%2
4521
February1st to 10thNight
73%38%10%5%2
2470
11th to 20thNight
67%28%13%8%2
2404
21st to endNight
69%28%12%7%2
2011
March1st to 10thNight
69%37%15%7%
2100
11th to 20thNight
65%39%13%9%1
2067
21st to endNight
72%311%12%3
2178
April1st to 10thNight
71%29%12%5%1
1811
11th to 20thNight
63%410%15%5%4
1732
21st to endNight
61%311%17%6%2
1620
May1st to 10thNight
54%214%22%7%2
1584
11th to 20thNight
60%212%17%6%3
1416
21st to endNight
60%414%18%4
1552
June1st to 10thNight
55%416%23%3
1440
11th to 20thNight
52%5%16%23%5%
1430
21st to endNight
44%214%27%8%4
1260
July1st to 10thNight
41%312%20%19%5%
1334
11th to 20thNight
34%29%23%24%7%
1392
21st to endNight
28%46%29%26%7%
1590
August1st to 10thNight
38%311%29%14%5%
1602
11th to 20thNight
32%310%32%18%6%
1602
21st to endNight
34%310%29%20%5%
1867
September1st to 10thNight
29%310%27%20%11%
1800
11th to 20thNight
40%312%23%15%8%
1876
21st to endNight
40%313%20%16%9%
2018
October1st to 10thNight
46%38%21%15%7%
2160
11th to 20thNight
48%311%19%16%4
2160
21st to endNight
54%39%15%12%6%
2376
November1st to 10thNight
64%49%14%8%1
2494
11th to 20thNight
67%29%10%7%4
2660
21st to endNight
59%38%11%11%8%
2660
December1st to 10thNight
62%39%12%11%3
2660
11th to 20thNight
68%49%11%8%1
3276
21st to endNight
74%18%12%41
4862

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 10thDay
52%11%21%9%6%
180
11th to 20thDay
48%9%17%15%10%1
246
21st to endDay
42%9%17%21%9%1
407
February1st to 10thDay
45%11%17%21%5%
370
11th to 20thDay
44%14%21%17%31
365
21st to endDay
47%14%19%16%4
322
March1st to 10thDay
42%12%21%19%5%
460
11th to 20thDay
39%12%20%19%6%2
449
21st to endDay
44%16%19%15%6%1
462
April1st to 10thDay
44%13%20%17%5%1
420
11th to 20thDay
41%15%23%13%5%3
412
21st to endDay
31%18%27%15%7%2
420
May1st to 10thDay
27%16%30%16%7%3
423
11th to 20thDay
36%16%22%18%6%2
448
21st to endDay
29%13%28%19%9%2
485
June1st to 10thDay
28%14%28%19%8%3
450
11th to 20thDay
27%20%31%15%7%1
450
21st to endDay
12%13%38%27%8%2
629
July1st to 10thDay
11%11%41%26%10%2
500
11th to 20thDay
10%13%35%28%10%4
444
21st to endDay
49%38%33%12%4
487
August1st to 10thDay
9%6%36%31%14%4
447
11th to 20thDay
7%5%34%34%15%5%
437
21st to endDay
8%11%36%29%11%6%
495
September1st to 10thDay
9%11%33%26%15%6%
450
11th to 20thDay
17%13%27%26%14%4
450
21st to endDay
20%12%27%26%13%3
450
October1st to 10thDay
23%13%24%23%14%4
450
11th to 20thDay
27%11%20%20%18%4
450
21st to endDay
36%11%21%19%11%3
495
November1st to 10thDay
39%12%20%17%11%1
253
11th to 20thDay
38%10%23%16%11%2
180
21st to endDay
41%9%17%26%7%
180
December1st to 10thDay
44%7%22%11%12%4
180
11th to 20thDay
51%10%24%10%5%1
180
21st to endDay
51%8%18%17%6%
198
January1st to 10thNight
49%9%13%17%10%1
760
11th to 20thNight
45%6%12%19%14%3
760
21st to endNight
38%6%10%28%15%3
836
February1st to 10thNight
41%6%11%28%12%2
760
11th to 20thNight
38%9%12%26%14%1
744
21st to endNight
43%10%12%23%13%
628
March1st to 10thNight
43%7%14%23%13%1
760
11th to 20thNight
37%7%12%27%15%1
752
21st to endNight
44%8%11%22%14%1
792
April1st to 10thNight
40%10%10%23%15%2
720
11th to 20thNight
33%9%15%24%14%3
664
21st to endNight
33%6%12%30%17%2
540
May1st to 10thNight
27%8%14%27%21%3
504
11th to 20thNight
31%6%11%26%24%3
354
21st to endNight
31%6%16%23%21%3
389
June1st to 10thNight
26%6%16%31%21%2
360
11th to 20thNight
23%7%17%33%18%3
360
21st to endNight
19%416%32%27%3
360
July1st to 10thNight
13%5%12%37%31%3
350
11th to 20thNight
16%320%34%26%2
348
21st to endNight
8%316%35%32%6%
501
August1st to 10thNight
12%47%35%34%8%
537
11th to 20thNight
10%47%27%43%9%
534
21st to endNight
14%313%33%30%5%
679
September1st to 10thNight
13%415%28%36%5%
720
11th to 20thNight
16%5%9%28%30%12%
720
21st to endNight
21%410%32%28%5%
720
October1st to 10thNight
21%5%13%29%26%6%
720
11th to 20thNight
26%411%28%24%8%
720
21st to endNight
32%8%15%23%17%5%
792
November1st to 10thNight
39%6%11%27%17%1
740
11th to 20thNight
43%8%11%24%13%1
760
21st to endNight
31%8%14%30%14%3
760
December1st to 10thNight
36%5%16%22%19%2
760
11th to 20thNight
45%8%13%22%11%1
760
21st to endNight
49%9%14%21%7%1
836
Page generated at 2024-03-15 11:01:46. Version ac07

Copyright © 2024 Attilla Danko.


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