Otterburn Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Otterburn Park clear sky chart from 2005-11-06 to 2024-01-22.

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
30%
22577
13%
74830
8%
22537
37%
22537
15%
54163

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
18%
760
8%
2649
4%
757
22%
757
8%
2134
January11th to 20thNight
18%
760
9%
2660
5%
760
25%
760
9%
2116
January21st to endNight
24%
800
11%
2798
7%
800
31%
800
13%
2065
February1st to 10thNight
18%
720
8%
2403
4%
720
24%
720
10%
1919
February11th to 20thNight
21%
703
11%
2159
4%
700
30%
700
13%
1630
February21st to endNight
25%
592
14%
1776
7%
592
35%
592
15%
1323
March1st to 10thNight
27%
720
15%
2160
10%
720
34%
720
15%
1628
March11th to 20thNight
25%
720
14%
2104
7%
720
33%
720
15%
1575
March21st to endNight
30%
792
21%
1980
9%
792
37%
792
22%
1456
April1st to 10thNight
26%
720
14%
1800
4%
720
31%
720
18%
1378
April11th to 20thNight
29%
711
15%
1775
4%
711
35%
711
21%
1311
April21st to endNight
27%
552
17%
1632
8%
552
33%
552
18%
1177
May1st to 10thNight
27%
442
15%
1522
10%
442
36%
442
17%
1050
May11th to 20thNight
33%
354
18%
1416
18%
354
42%
354
16%
924
May21st to endNight
34%
388
12%
1551
9%
388
46%
388
19%
987
June1st to 10thNight
35%
360
10%
1440
10%
360
43%
360
15%
978
June11th to 20thNight
40%
360
11%
1440
12%
360
48%
360
17%
914
June21st to endNight
41%
360
9%
1440
12%
360
48%
360
16%
964
July1st to 10thNight
46%
350
12%
1400
16%
350
52%
350
22%
849
July11th to 20thNight
52%
348
13%
1392
19%
348
56%
348
23%
834
July21st to endNight
50%
394
13%
1486
15%
372
54%
372
20%
916
August1st to 10thNight
55%
358
16%
1422
18%
356
58%
356
21%
873
August11th to 20thNight
53%
523
15%
1587
10%
523
56%
523
26%
1047
August21st to endNight
49%
792
17%
1980
10%
792
51%
792
30%
1354
September1st to 10thNight
48%
720
14%
1800
7%
720
50%
720
30%
1238
September11th to 20thNight
51%
720
19%
1894
11%
720
54%
720
33%
1209
September21st to endNight
42%
720
21%
1980
14%
720
46%
720
27%
1334
October1st to 10thNight
36%
720
19%
2070
12%
720
44%
720
23%
1426
October11th to 20thNight
32%
720
15%
2220
10%
720
39%
720
16%
1623
October21st to endNight
23%
792
11%
2574
6%
792
30%
792
13%
1925
November1st to 10thNight
24%
740
15%
2407
9%
740
33%
740
15%
1707
November11th to 20thNight
24%
760
17%
2513
11%
760
32%
760
15%
1819
November21st to endNight
19%
760
11%
2660
6%
760
27%
760
10%
2029
December1st to 10thNight
18%
760
7%
2660
3%
760
22%
760
7%
2177
December11th to 20thNight
16%
760
11%
3240
4%
759
24%
759
7%
2492
December21st to endNight
15%
826
6%
4840
2%
817
22%
817
5%
3782

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
18%9%37%6%35%5%5%7%32%
74836
Night
19%10%47%6%3445%6%31%
75094
TransparencyDay
50%7%13%20%9%1
74541
Night
53%6%11%19%9%1
74923
SeeingDay
22%11%29%24%11%3
13508
Night
23%10%29%28%9%1
22588

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 10thDay
22%17%6%10%6%4433321%
1517
11th to 20thDay
20%15%6%10%7%3444423%
1520
21st to endDay
12%14%5%8%8%36%5%6%7%27%
1592
February1st to 10thDay
17%16%410%7%44446%23%
1553
11th to 20thDay
15%13%6%10%7%44446%26%
1688
21st to endDay
20%13%6%7%7%34445%27%
1480
March1st to 10thDay
16%13%48%8%46%445%29%
1797
11th to 20thDay
17%11%47%6%3435%7%31%
1854
21st to endDay
19%11%47%5%3445%433%
2376
April1st to 10thDay
24%10%47%6%34445%29%
2160
11th to 20thDay
22%7%36%434446%38%
2134
21st to endDay
23%8%46%6%345%45%32%
2326
May1st to 10thDay
21%7%46%5%335%46%36%
2452
11th to 20thDay
18%7%26%5%45%5%6%7%36%
2478
21st to endDay
18%6%26%6%36%5%6%7%35%
2725
June1st to 10thDay
23%7%35%6%35%5%5%8%30%
2520
11th to 20thDay
16%6%35%4345%6%8%39%
2520
21st to endDay
21%7%35%6%35%6%6%7%31%
2520
July1st to 10thDay
13%5%36%5%445%7%9%40%
2520
11th to 20thDay
13%5%35%5%45%6%7%10%36%
2520
21st to endDay
13%6%25%6%45%6%7%10%36%
2744
August1st to 10thDay
13%7%27%6%35%6%7%9%37%
2506
11th to 20thDay
11%5%25%6%35%5%6%10%40%
2291
21st to endDay
13%6%25%5%35%5%6%8%41%
2376
September1st to 10thDay
12%5%36%5%35%6%6%8%42%
2160
11th to 20thDay
16%6%2342345%7%48%
2066
21st to endDay
16%6%26%435%5%6%8%40%
1980
October1st to 10thDay
21%6%36%6%35%5%5%6%32%
1888
11th to 20thDay
19%9%37%7%46%5%5%7%28%
1739
21st to endDay
27%9%36%5%3435%6%29%
1782
November1st to 10thDay
19%10%36%7%35%447%33%
1671
11th to 20thDay
18%12%47%6%446%5%7%28%
1663
21st to endDay
23%12%47%6%345%5%6%24%
1520
December1st to 10thDay
25%14%6%9%7%35%45%5%18%
1520
11th to 20thDay
24%13%48%5%345%45%25%
1906
21st to endDay
28%15%5%10%6%3433418%
2772
January1st to 10thNight
20%17%6%10%8%3444420%
2649
11th to 20thNight
17%16%6%10%7%35%445%22%
2660
21st to endNight
14%13%6%9%8%34446%28%
2798
February1st to 10thNight
17%15%7%11%8%44445%20%
2403
11th to 20thNight
16%11%7%9%7%37%35%5%28%
2157
21st to endNight
17%12%49%5%45%445%30%
1776
March1st to 10thNight
18%14%5%8%7%34445%29%
2150
11th to 20thNight
20%13%5%7%6%3344431%
2104
21st to endNight
19%11%47%5%3444437%
1980
April1st to 10thNight
25%9%47%434446%30%
1800
11th to 20thNight
23%7%47%5%34446%34%
1775
21st to endNight
22%9%36%5%34446%34%
1632
May1st to 10thNight
21%10%36%6%24447%33%
1522
11th to 20thNight
20%8%37%4345%5%6%36%
1415
21st to endNight
17%7%35%5%35%5%6%7%39%
1550
June1st to 10thNight
23%8%36%4445%48%31%
1440
11th to 20thNight
17%5%36%5%346%6%8%37%
1440
21st to endNight
16%7%47%5%35%5%5%8%34%
1440
July1st to 10thNight
12%5%25%6%36%5%7%8%39%
1440
11th to 20thNight
10%6%25%5%45%7%7%9%39%
1440
21st to endNight
13%5%35%6%45%5%7%9%38%
1574
August1st to 10thNight
14%5%26%4345%8%9%39%
1432
11th to 20thNight
13%5%25%6%35%6%6%8%40%
1587
21st to endNight
14%7%25%5%35%5%5%7%42%
1980
September1st to 10thNight
14%6%26%5%335%6%7%43%
1800
11th to 20thNight
16%6%2443335%6%48%
1894
21st to endNight
17%6%35%5%2445%7%42%
1980
October1st to 10thNight
19%6%26%6%345%5%6%39%
2070
11th to 20thNight
22%7%47%6%35%445%32%
2220
21st to endNight
25%9%38%6%3444429%
2574
November1st to 10thNight
20%10%37%5%35%5%5%6%32%
2407
11th to 20thNight
21%11%37%6%35%445%32%
2513
21st to endNight
24%12%47%6%34345%27%
2660
December1st to 10thNight
24%15%7%9%6%34445%19%
2660
11th to 20thNight
23%15%5%8%6%3443425%
3288
21st to endNight
27%15%5%9%43334422%
4884

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
69%5%9%13%3
1518
11th to 20thDay
65%6%10%13%7%
1520
21st to endDay
56%8%12%17%7%1
1592
February1st to 10thDay
64%5%9%16%41
1553
11th to 20thDay
59%6%12%15%7%1
1697
21st to endDay
61%411%14%8%1
1480
March1st to 10thDay
58%5%10%17%8%2
1800
11th to 20thDay
52%6%13%16%12%2
1854
21st to endDay
52%5%10%20%10%2
2376
April1st to 10thDay
58%5%9%18%10%2
2160
11th to 20thDay
47%6%9%22%13%1
2134
21st to endDay
54%6%10%18%10%3
2326
May1st to 10thDay
50%5%10%20%14%2
2452
11th to 20thDay
46%6%12%19%14%2
2482
21st to endDay
46%8%13%18%12%2
2725
June1st to 10thDay
50%8%12%18%10%1
2520
11th to 20thDay
42%7%13%24%13%2
2520
21st to endDay
50%8%13%19%10%1
2520
July1st to 10thDay
38%9%15%26%11%1
2450
11th to 20thDay
40%9%17%27%7%
2445
21st to endDay
41%9%17%24%8%
2591
August1st to 10thDay
42%10%17%25%7%
2492
11th to 20thDay
38%9%19%24%10%
2291
21st to endDay
38%8%16%26%12%
2376
September1st to 10thDay
38%9%16%26%11%
2160
11th to 20thDay
36%6%13%32%13%
2066
21st to endDay
41%7%15%26%10%
1980
October1st to 10thDay
51%8%13%20%8%
1888
11th to 20thDay
53%9%14%18%6%
1739
21st to endDay
57%5%13%17%7%1
1782
November1st to 10thDay
50%8%13%20%8%1
1671
11th to 20thDay
54%8%13%16%8%
1663
21st to endDay
60%9%13%13%5%
1520
December1st to 10thDay
69%6%10%12%3
1520
11th to 20thDay
61%6%11%16%6%
1906
21st to endDay
69%7%12%8%4
2772
January1st to 10thNight
67%6%11%13%4
2649
11th to 20thNight
65%7%9%12%6%1
2660
21st to endNight
58%5%11%15%10%1
2798
February1st to 10thNight
66%5%9%14%5%1
2403
11th to 20thNight
59%5%11%17%7%
2159
21st to endNight
57%5%9%16%12%1
1776
March1st to 10thNight
57%6%9%17%10%2
2160
11th to 20thNight
57%5%9%15%12%2
2105
21st to endNight
51%5%8%20%13%3
1980
April1st to 10thNight
55%5%9%17%12%1
1800
11th to 20thNight
51%5%8%21%13%2
1775
21st to endNight
52%6%7%20%12%3
1632
May1st to 10thNight
51%5%7%19%13%5%
1522
11th to 20thNight
47%7%8%18%16%4
1416
21st to endNight
43%8%12%20%15%3
1551
June1st to 10thNight
51%7%10%22%10%1
1440
11th to 20thNight
43%9%11%21%13%3
1440
21st to endNight
47%9%12%19%13%1
1440
July1st to 10thNight
39%9%14%24%14%1
1400
11th to 20thNight
37%9%15%28%11%
1392
21st to endNight
40%9%17%25%8%1
1486
August1st to 10thNight
39%9%17%25%10%
1422
11th to 20thNight
39%9%17%23%11%
1587
21st to endNight
40%8%15%26%11%1
1980
September1st to 10thNight
39%9%12%25%14%1
1800
11th to 20thNight
36%5%15%31%12%1
1894
21st to endNight
42%7%11%26%14%1
1980
October1st to 10thNight
45%7%11%25%12%1
2070
11th to 20thNight
53%7%11%23%6%
2220
21st to endNight
58%6%12%15%8%1
2574
November1st to 10thNight
52%7%12%21%7%1
2407
11th to 20thNight
54%6%12%17%9%1
2513
21st to endNight
60%7%12%16%5%
2660
December1st to 10thNight
68%6%11%12%3
2660
11th to 20thNight
63%5%10%16%5%
3288
21st to endNight
67%6%10%14%3
4884

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
29%14%29%20%8%
180
11th to 20thDay
29%17%32%17%41
180
21st to endDay
21%14%33%22%8%1
178
February1st to 10thDay
34%19%33%13%1
211
11th to 20thDay
24%14%37%21%31
356
21st to endDay
27%14%29%27%3
346
March1st to 10thDay
24%12%33%25%6%
420
11th to 20thDay
22%15%34%19%8%1
420
21st to endDay
30%9%29%23%8%1
462
April1st to 10thDay
29%12%31%19%7%2
420
11th to 20thDay
29%17%22%19%9%3
412
21st to endDay
27%14%30%17%10%2
420
May1st to 10thDay
25%12%32%19%11%2
423
11th to 20thDay
18%11%31%26%12%3
447
21st to endDay
18%13%35%22%11%2
485
June1st to 10thDay
24%11%27%27%9%2
450
11th to 20thDay
17%9%28%31%13%2
450
21st to endDay
21%9%27%26%14%3
450
July1st to 10thDay
13%7%26%31%19%4
445
11th to 20thDay
14%5%30%33%14%4
444
21st to endDay
15%7%27%32%16%2
488
August1st to 10thDay
14%5%25%31%20%5%
446
11th to 20thDay
12%6%22%34%18%8%
439
21st to endDay
14%9%24%25%18%10%
495
September1st to 10thDay
13%7%29%29%14%8%
450
11th to 20thDay
17%8%22%27%16%11%
450
21st to endDay
17%9%27%24%18%6%
450
October1st to 10thDay
22%12%28%21%14%4
450
11th to 20thDay
23%14%30%20%12%1
419
21st to endDay
32%13%27%22%6%
396
November1st to 10thDay
26%14%29%22%8%1
365
11th to 20thDay
25%17%32%17%7%1
323
21st to endDay
31%13%29%20%6%1
180
December1st to 10thDay
34%11%19%26%7%3
180
11th to 20thDay
24%24%34%14%3
180
21st to endDay
33%19%26%17%42
198
January1st to 10thNight
28%11%31%24%5%
760
11th to 20thNight
26%11%34%21%7%
760
21st to endNight
21%10%33%28%7%1
800
February1st to 10thNight
24%11%36%24%5%1
720
11th to 20thNight
21%12%38%23%5%
703
21st to endNight
24%11%32%29%4
592
March1st to 10thNight
24%12%31%28%5%
720
11th to 20thNight
26%11%32%24%7%
720
21st to endNight
24%9%30%28%8%1
792
April1st to 10thNight
28%12%27%27%6%
720
11th to 20thNight
25%14%27%27%7%1
711
21st to endNight
27%11%29%25%7%1
552
May1st to 10thNight
26%7%32%27%7%1
442
11th to 20thNight
22%9%31%29%8%1
354
21st to endNight
19%8%34%30%9%
389
June1st to 10thNight
25%6%28%31%9%1
360
11th to 20thNight
20%5%29%35%11%
360
21st to endNight
17%5%31%34%13%1
360
July1st to 10thNight
12%5%30%38%15%
350
11th to 20thNight
10%127%45%15%1
348
21st to endNight
13%424%43%16%1
394
August1st to 10thNight
13%5%17%43%20%1
358
11th to 20thNight
13%322%36%23%2
523
21st to endNight
16%5%22%36%20%2
792
September1st to 10thNight
16%5%24%39%15%1
720
11th to 20thNight
18%5%21%33%20%3
720
21st to endNight
19%7%27%31%14%3
720
October1st to 10thNight
21%8%29%30%12%
720
11th to 20thNight
26%9%27%28%9%1
720
21st to endNight
29%10%32%25%5%
792
November1st to 10thNight
25%12%31%24%7%1
740
11th to 20thNight
25%14%30%21%9%1
760
21st to endNight
29%14%30%20%7%
760
December1st to 10thNight
31%13%28%23%6%
760
11th to 20thNight
28%15%31%20%5%1
760
21st to endNight
33%14%30%19%5%
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