Beckwith Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beckwith Park clear sky chart from 2005-11-06 to 2024-03-28.

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
27%
22878
13%
81067
8%
22793
35%
22793
14%
58234

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
12%
754
8%
4407
2%
737
21%
737
4%
3331
January11th to 20thNight
17%
758
7%
4412
4%
740
23%
740
4%
3379
January21st to endNight
19%
826
7%
4714
7%
814
27%
814
6%
3785
February1st to 10thNight
15%
760
11%
2470
3%
760
24%
760
10%
1903
February11th to 20thNight
13%
741
13%
2405
4%
740
26%
740
12%
1786
February21st to endNight
21%
628
14%
1888
6%
628
31%
628
13%
1411
March1st to 10thNight
19%
760
15%
2261
8%
760
28%
760
14%
1689
March11th to 20thNight
19%
760
16%
2089
6%
760
29%
760
15%
1522
March21st to endNight
25%
821
20%
2149
7%
821
34%
821
21%
1516
April1st to 10thNight
21%
720
16%
1800
5%
720
27%
720
19%
1327
April11th to 20thNight
23%
711
18%
1775
5%
711
30%
711
19%
1290
April21st to endNight
26%
620
16%
1700
7%
620
32%
620
18%
1260
May1st to 10thNight
30%
360
17%
1440
13%
360
40%
360
15%
955
May11th to 20thNight
31%
354
21%
1416
15%
354
47%
354
18%
866
May21st to endNight
35%
389
14%
1551
11%
388
48%
388
23%
896
June1st to 10thNight
34%
360
10%
1440
10%
360
43%
360
16%
946
June11th to 20thNight
38%
360
13%
1440
15%
360
47%
360
20%
871
June21st to endNight
37%
360
11%
1440
12%
360
44%
360
16%
946
July1st to 10thNight
48%
350
14%
1400
19%
350
56%
350
25%
796
July11th to 20thNight
50%
348
16%
1392
21%
348
56%
348
24%
811
July21st to endNight
51%
394
15%
1486
16%
372
57%
372
25%
862
August1st to 10thNight
48%
418
16%
1482
12%
416
55%
416
24%
913
August11th to 20thNight
53%
534
17%
1598
12%
534
57%
534
30%
1007
August21st to endNight
44%
792
18%
1980
7%
792
49%
792
30%
1317
September1st to 10thNight
41%
720
17%
1800
7%
720
45%
720
31%
1215
September11th to 20thNight
49%
720
22%
1800
12%
720
53%
720
35%
1159
September21st to endNight
42%
720
21%
2038
15%
720
47%
720
27%
1344
October1st to 10thNight
34%
720
17%
2160
11%
720
41%
720
20%
1488
October11th to 20thNight
25%
720
14%
2160
7%
720
33%
720
17%
1556
October21st to endNight
24%
792
13%
2502
6%
792
33%
792
13%
1869
November1st to 10thNight
24%
740
17%
2407
9%
740
34%
740
17%
1655
November11th to 20thNight
22%
760
16%
2657
9%
760
32%
760
13%
1909
November21st to endNight
18%
760
10%
2660
4%
760
27%
760
10%
2025
December1st to 10thNight
14%
760
8%
2660
4%
760
20%
760
7%
2182
December11th to 20thNight
16%
760
12%
3243
6%
759
25%
759
8%
2454
December21st to endNight
12%
828
5%
4845
2%
817
18%
817
4%
3993

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
17%10%47%6%35%5%5%6%32%
78609
Night
17%11%48%6%3445%6%32%
81379
TransparencyDay
52%7%11%19%10%1
78314
Night
54%6%11%19%10%1
81208
SeeingDay
23%16%30%20%8%3
13611
Night
23%14%30%24%9%1
22906

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
14%16%6%9%9%45%445%23%
2517
11th to 20thDay
14%14%6%10%9%5%6%5%45%23%
2520
21st to endDay
16%19%7%12%8%5%5%44417%
2934
February1st to 10thDay
15%14%5%12%8%35%445%23%
1710
11th to 20thDay
13%13%6%9%7%45%45%5%29%
1663
21st to endDay
20%13%39%7%45%5%5%6%25%
1565
March1st to 10thDay
16%12%5%10%7%44445%29%
1912
11th to 20thDay
16%12%47%8%45%445%32%
2090
21st to endDay
19%10%36%6%33345%37%
2361
April1st to 10thDay
21%11%47%5%34446%32%
2160
11th to 20thDay
21%8%35%6%24435%37%
2134
21st to endDay
23%9%36%6%24346%32%
2271
May1st to 10thDay
19%9%27%6%35%5%5%6%34%
2520
11th to 20thDay
16%7%36%435%45%7%39%
2478
21st to endDay
14%6%36%6%36%5%5%7%38%
2725
June1st to 10thDay
20%8%36%6%35%6%5%6%30%
2520
11th to 20thDay
15%5%26%5%35%6%6%8%38%
2520
21st to endDay
17%7%36%7%45%5%6%7%32%
2520
July1st to 10thDay
11%5%345%35%6%7%9%41%
2520
11th to 20thDay
12%6%26%5%35%6%7%9%39%
2520
21st to endDay
12%5%25%5%36%6%7%9%38%
2744
August1st to 10thDay
11%6%36%6%45%5%6%8%39%
2444
11th to 20thDay
12%7%36%6%45%6%6%9%39%
2285
21st to endDay
14%6%25%5%446%7%8%40%
2376
September1st to 10thDay
14%6%25%6%446%6%7%41%
2160
11th to 20thDay
13%425%5%35%5%6%7%46%
2160
21st to endDay
17%6%35%6%35%5%5%7%39%
1917
October1st to 10thDay
20%8%37%5%3445%6%36%
1800
11th to 20thDay
22%10%37%7%45%45%6%28%
1800
21st to endDay
26%10%36%7%34446%26%
1854
November1st to 10thDay
16%8%36%6%37%5%5%6%34%
1671
11th to 20thDay
18%12%48%7%345%46%28%
1520
21st to endDay
20%14%49%7%5%5%5%5%5%21%
1520
December1st to 10thDay
22%17%6%8%7%44445%17%
1520
11th to 20thDay
20%14%6%8%6%44445%25%
1906
21st to endDay
27%16%6%11%6%3433319%
2772
January1st to 10thNight
17%15%7%10%7%45%45%6%21%
4429
11th to 20thNight
13%15%6%11%10%46%5%45%22%
4440
21st to endNight
17%19%7%9%8%4434420%
4720
February1st to 10thNight
14%15%5%11%9%45%45%6%23%
2470
11th to 20thNight
13%12%6%9%8%44445%29%
2403
21st to endNight
15%13%49%8%35%446%29%
1888
March1st to 10thNight
17%12%5%9%7%45%44430%
2251
11th to 20thNight
15%13%6%8%5%24345%34%
2089
21st to endNight
17%8%46%6%34345%39%
2149
April1st to 10thNight
20%9%46%6%3435%5%35%
1800
11th to 20thNight
20%8%38%6%34336%37%
1775
21st to endNight
20%11%37%6%24446%32%
1700
May1st to 10thNight
21%7%35%5%25%5%5%6%35%
1440
11th to 20thNight
18%6%25%5%3446%6%41%
1415
21st to endNight
13%6%35%425%5%5%7%45%
1550
June1st to 10thNight
18%6%36%7%35%5%6%8%34%
1440
11th to 20thNight
14%6%35%6%245%5%7%42%
1440
21st to endNight
15%7%36%6%35%5%6%8%36%
1440
July1st to 10thNight
10%5%26%6%35%46%9%45%
1440
11th to 20thNight
11%5%25%5%35%5%7%8%44%
1440
21st to endNight
9%425%5%45%5%7%9%45%
1574
August1st to 10thNight
8%6%37%6%35%5%6%8%43%
1492
11th to 20thNight
10%7%35%5%25%46%7%46%
1598
21st to endNight
10%6%25%5%35%5%6%8%45%
1980
September1st to 10thNight
12%5%37%6%24446%47%
1800
11th to 20thNight
14%5%2443445%7%49%
1800
21st to endNight
16%6%345%34447%43%
2038
October1st to 10thNight
17%8%36%5%3445%7%37%
2160
11th to 20thNight
21%8%36%6%45%5%5%6%31%
2160
21st to endNight
23%10%47%5%3445%6%28%
2502
November1st to 10thNight
19%10%36%5%3445%6%36%
2407
11th to 20thNight
17%11%47%6%36%45%6%31%
2657
21st to endNight
21%13%48%7%4445%6%24%
2660
December1st to 10thNight
20%17%5%10%7%35%5%45%18%
2660
11th to 20thNight
22%14%5%8%7%3443427%
3288
21st to endNight
30%16%5%11%5%3443317%
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
62%6%13%11%6%1
2518
11th to 20thDay
64%6%10%12%7%1
2520
21st to endDay
71%6%9%9%5%1
2934
February1st to 10thDay
63%6%7%18%5%2
1710
11th to 20thDay
58%5%10%17%9%1
1672
21st to endDay
61%5%10%12%10%1
1565
March1st to 10thDay
58%5%10%16%11%1
1915
11th to 20thDay
55%5%11%16%11%3
2090
21st to endDay
51%47%18%14%6%
2361
April1st to 10thDay
54%46%19%14%3
2160
11th to 20thDay
50%47%21%16%2
2134
21st to endDay
55%5%7%15%14%4
2271
May1st to 10thDay
50%5%8%17%15%3
2520
11th to 20thDay
45%6%9%22%16%2
2482
21st to endDay
44%7%12%21%13%2
2725
June1st to 10thDay
53%6%9%18%12%1
2520
11th to 20thDay
42%9%10%24%13%3
2520
21st to endDay
50%9%11%18%11%1
2520
July1st to 10thDay
36%8%12%28%15%1
2450
11th to 20thDay
38%8%15%27%11%
2445
21st to endDay
41%10%13%25%11%
2591
August1st to 10thDay
42%10%13%24%10%1
2430
11th to 20thDay
41%8%14%26%10%1
2285
21st to endDay
40%7%14%26%12%1
2376
September1st to 10thDay
41%8%13%27%11%
2160
11th to 20thDay
37%7%11%31%14%
2160
21st to endDay
44%7%13%27%9%
1917
October1st to 10thDay
50%5%11%23%11%1
1800
11th to 20thDay
56%7%13%17%7%1
1800
21st to endDay
60%5%11%16%8%1
1854
November1st to 10thDay
49%7%13%22%7%1
1671
11th to 20thDay
57%5%13%14%10%1
1520
21st to endDay
64%8%12%10%7%
1520
December1st to 10thDay
68%7%11%11%3
1520
11th to 20thDay
62%7%14%12%4
1906
21st to endDay
72%46%14%4
2772
January1st to 10thNight
64%7%13%12%4
4429
11th to 20thNight
64%7%13%11%5%
4440
21st to endNight
68%6%9%10%6%1
4720
February1st to 10thNight
62%5%11%16%6%1
2470
11th to 20thNight
58%5%10%19%8%1
2405
21st to endNight
57%5%9%19%10%1
1888
March1st to 10thNight
57%5%10%16%11%2
2261
11th to 20thNight
53%5%10%19%12%2
2090
21st to endNight
49%47%21%15%4
2149
April1st to 10thNight
52%47%20%15%2
1800
11th to 20thNight
51%46%20%17%1
1775
21st to endNight
53%6%6%16%16%3
1700
May1st to 10thNight
49%6%6%19%15%5%
1440
11th to 20thNight
43%6%7%23%18%3
1416
21st to endNight
37%6%16%20%19%2
1551
June1st to 10thNight
47%8%11%22%10%1
1440
11th to 20thNight
41%6%11%22%17%2
1440
21st to endNight
45%9%12%21%13%
1440
July1st to 10thNight
34%7%12%26%18%3
1400
11th to 20thNight
37%7%13%30%13%
1392
21st to endNight
34%10%16%26%14%
1486
August1st to 10thNight
37%9%16%24%13%1
1482
11th to 20thNight
37%7%16%28%12%1
1598
21st to endNight
36%9%14%28%12%1
1980
September1st to 10thNight
38%7%11%29%14%1
1800
11th to 20thNight
33%7%14%34%10%1
1800
21st to endNight
41%6%12%31%10%1
2038
October1st to 10thNight
47%6%9%23%14%1
2160
11th to 20thNight
52%6%13%20%9%
2160
21st to endNight
57%6%12%16%9%
2502
November1st to 10thNight
50%5%13%21%9%1
2407
11th to 20thNight
54%6%11%18%10%1
2657
21st to endNight
60%6%13%16%5%
2660
December1st to 10thNight
68%7%9%13%4
2660
11th to 20thNight
62%5%10%15%7%1
3288
21st to endNight
73%47%13%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
22%24%33%16%5%
180
11th to 20thDay
29%21%32%15%21
180
21st to endDay
25%18%36%17%3
245
February1st to 10thDay
30%29%28%13%1
270
11th to 20thDay
26%29%38%6%1
270
21st to endDay
32%21%34%11%1
377
March1st to 10thDay
26%22%32%17%4
460
11th to 20thDay
27%20%32%16%3
460
21st to endDay
31%22%28%13%6%1
490
April1st to 10thDay
30%22%28%14%5%1
420
11th to 20thDay
33%17%22%17%8%2
412
21st to endDay
32%19%27%15%6%2
420
May1st to 10thDay
27%14%32%18%6%3
423
11th to 20thDay
21%19%32%20%6%2
447
21st to endDay
18%16%34%20%10%2
485
June1st to 10thDay
26%13%32%20%8%1
450
11th to 20thDay
18%14%31%24%10%2
450
21st to endDay
21%12%33%20%13%2
450
July1st to 10thDay
13%7%28%33%16%2
445
11th to 20thDay
12%11%32%28%14%3
444
21st to endDay
13%9%32%31%11%3
488
August1st to 10thDay
14%9%31%29%13%4
446
11th to 20thDay
13%7%28%29%16%7%
439
21st to endDay
13%13%31%24%12%7%
495
September1st to 10thDay
16%14%27%24%12%8%
450
11th to 20thDay
13%10%27%24%16%10%
450
21st to endDay
19%13%29%21%13%5%
450
October1st to 10thDay
26%14%26%18%12%4
450
11th to 20thDay
28%20%28%18%5%2
450
21st to endDay
31%17%28%19%4
432
November1st to 10thDay
26%20%29%19%6%1
365
11th to 20thDay
28%24%27%13%7%1
180
21st to endDay
31%21%34%9%4
180
December1st to 10thDay
31%18%36%14%2
180
11th to 20thDay
30%29%28%11%2
180
21st to endDay
33%23%26%15%21
198
January1st to 10thNight
28%19%32%17%4
760
11th to 20thNight
30%18%29%19%41
760
21st to endNight
21%15%35%24%5%
836
February1st to 10thNight
23%21%33%19%3
760
11th to 20thNight
21%19%40%16%3
743
21st to endNight
24%22%31%19%5%
628
March1st to 10thNight
25%16%34%22%4
760
11th to 20thNight
24%22%29%19%5%
760
21st to endNight
24%14%30%23%7%1
821
April1st to 10thNight
27%15%31%23%4
720
11th to 20thNight
26%17%28%19%8%1
711
21st to endNight
27%13%29%23%7%1
620
May1st to 10thNight
24%9%28%27%10%1
360
11th to 20thNight
21%9%34%27%7%
354
21st to endNight
16%7%37%27%12%1
389
June1st to 10thNight
20%7%32%33%8%
360
11th to 20thNight
19%8%28%32%13%1
360
21st to endNight
18%8%31%30%13%
360
July1st to 10thNight
8%6%31%39%15%1
350
11th to 20thNight
13%5%26%41%14%1
348
21st to endNight
10%330%42%13%1
394
August1st to 10thNight
10%5%28%37%19%1
418
11th to 20thNight
11%424%34%26%2
534
21st to endNight
13%7%29%31%17%3
792
September1st to 10thNight
16%5%33%28%17%2
720
11th to 20thNight
18%7%23%28%20%4
720
21st to endNight
18%10%26%24%20%2
720
October1st to 10thNight
21%12%28%24%14%2
720
11th to 20thNight
25%14%29%22%8%1
720
21st to endNight
28%16%26%25%5%
792
November1st to 10thNight
28%14%29%21%8%1
740
11th to 20thNight
26%16%32%17%9%1
760
21st to endNight
30%18%27%18%6%1
760
December1st to 10thNight
31%18%30%19%3
760
11th to 20thNight
28%18%30%19%41
760
21st to endNight
35%16%28%18%2
836
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