Veasey Memorial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Veasey Memorial Park clear sky chart from 2005-11-05 to 2017-09-16.

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
29%
14869
18%
46810
8%
14837
40%
14837
21%
30633

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
16%
720
19%
2506
6%
716
33%
716
16%
1609
January16th to endNight
14%
768
18%
2688
4%
768
32%
768
14%
1731
February1st to 15thNight
17%
704
16%
2203
4%
701
32%
701
17%
1491
February16th to endNight
18%
631
22%
1893
6%
631
38%
631
19%
1249
March1st to 15thNight
18%
720
17%
2148
6%
720
32%
720
17%
1483
March16th to endNight
22%
768
22%
2043
7%
768
34%
768
22%
1394
April1st to 15thNight
23%
718
18%
1796
4%
718
31%
718
22%
1267
April16th to endNight
26%
579
18%
1659
5%
579
36%
579
21%
1135
May1st to 15thNight
26%
540
15%
1620
7%
540
33%
540
19%
1127
May16th to endNight
28%
420
11%
1542
7%
419
36%
419
17%
1023
June1st to 15thNight
34%
360
11%
1440
10%
360
42%
360
14%
977
June16th to endNight
41%
360
12%
1440
13%
360
48%
360
21%
880
July1st to 15thNight
49%
340
12%
1360
16%
340
54%
340
22%
822
July16th to endNight
51%
376
15%
1418
15%
354
58%
354
21%
880
August1st to 15thNight
50%
510
16%
1581
12%
508
53%
508
27%
999
August16th to endNight
54%
702
20%
1848
11%
702
57%
702
32%
1203
September1st to 15thNight
43%
720
20%
1869
9%
720
49%
720
35%
1197
September16th to endNight
46%
661
26%
1825
17%
661
54%
661
34%
1112
October1st to 15thNight
33%
660
22%
1842
10%
660
44%
660
25%
1213
October16th to endNight
25%
704
17%
2288
6%
704
38%
704
21%
1478
November1st to 15thNight
31%
700
21%
2277
10%
700
44%
700
22%
1431
November16th to endNight
25%
720
20%
2340
8%
720
40%
720
18%
1509
December1st to 15thNight
19%
720
17%
2496
5%
720
35%
720
16%
1637
December16th to endNight
15%
768
18%
2688
4%
768
32%
768
14%
1786

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%6%2442445%7%39%
47958
Night
17%6%25%424446%40%
46980
Cloud CoverDay
17%6%2442445%7%39%
47968
Night
17%6%25%424446%40%
46985
TransparencyDay
43%5%12%21%14%2
47646
Night
43%5%11%21%15%2
46810
SeeingDay
21%11%32%22%9%2
5895
Night
20%12%33%24%8%
14869

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 15thDay
16%6%345%24445%41%
1432
16th to endDay
15%6%235%3435%5%44%
1536
February1st to 15thDay
17%6%35%5%35%5%5%7%35%
1657
16th to endDay
14%9%35%5%2445%5%39%
1580
March1st to 15thDay
20%8%245%23447%34%
1802
16th to endDay
17%7%35%413446%40%
2179
April1st to 15thDay
18%6%245%24346%39%
2152
16th to endDay
20%5%145%24347%40%
2301
May1st to 15thDay
25%6%25%433447%32%
2332
16th to endDay
17%5%35%424449%38%
2583
June1st to 15thDay
24%5%24435%45%7%32%
2520
16th to endDay
16%5%25%5%25%5%7%8%35%
2520
July1st to 15thDay
13%4245%35%5%7%8%38%
2520
16th to endDay
12%5%26%5%35%5%6%8%39%
2654
August1st to 15thDay
12%5%25%5%35%6%6%8%38%
2355
16th to endDay
11%4144246%6%8%45%
2351
September1st to 15thDay
14%5%2442435%6%46%
2091
16th to endDay
15%5%23322435%51%
1825
October1st to 15thDay
21%5%24434445%41%
1786
16th to endDay
16%6%245%2345%5%42%
1584
November1st to 15thDay
21%6%24413345%43%
1581
16th to endDay
18%5%34323345%43%
1620
December1st to 15thDay
18%7%35%424436%39%
1461
16th to endDay
21%9%3432444435%
1536
January1st to 15thNight
16%7%35%5%33345%40%
2506
16th to endNight
15%9%35%424445%40%
2688
February1st to 15thNight
14%8%35%5%35%446%36%
2202
16th to endNight
17%8%33423345%41%
1893
March1st to 15thNight
19%7%25%424445%38%
2135
16th to endNight
16%7%35%423335%43%
2043
April1st to 15thNight
18%8%35%5%24436%38%
1796
16th to endNight
22%425%435%335%39%
1659
May1st to 15thNight
20%6%25%5%2445%5%36%
1620
16th to endNight
20%5%25%4335%6%7%34%
1540
June1st to 15thNight
24%7%2442445%7%32%
1440
16th to endNight
16%5%25%42445%8%40%
1440
July1st to 15thNight
13%5%25%43445%8%40%
1440
16th to endNight
13%5%15%5%35%5%5%8%39%
1514
August1st to 15thNight
10%4145%35%6%6%8%42%
1591
16th to endNight
12%5%15%435%45%8%44%
1848
September1st to 15thNight
14%5%2432335%7%48%
1869
16th to endNight
14%414313247%52%
1825
October1st to 15thNight
20%5%2442345%5%42%
1842
16th to endNight
20%5%24424346%40%
2288
November1st to 15thNight
16%6%24424346%44%
2277
16th to endNight
17%6%35%423446%41%
2340
December1st to 15thNight
19%7%35%324445%39%
2496
16th to endNight
19%7%35%424345%37%
2688

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
17%6%35%42445%5%41%
1432
16th to endDay
16%6%145%24345%44%
1536
February1st to 15thDay
17%6%36%5%35%45%6%35%
1657
16th to endDay
14%9%25%5%2445%5%39%
1580
March1st to 15thDay
21%7%34433446%34%
1812
16th to endDay
17%8%35%423345%41%
2179
April1st to 15thDay
18%6%26%424446%39%
2152
16th to endDay
19%4245%24347%40%
2301
May1st to 15thDay
25%6%26%42345%5%32%
2332
16th to endDay
17%5%24424348%39%
2583
June1st to 15thDay
24%5%23335%45%7%33%
2520
16th to endDay
16%5%25%5%35%5%6%9%34%
2520
July1st to 15thDay
13%5%245%36%5%7%9%38%
2520
16th to endDay
12%5%25%5%26%5%6%8%38%
2654
August1st to 15thDay
12%4245%446%7%8%38%
2355
16th to endDay
11%4234345%6%8%45%
2351
September1st to 15thDay
13%5%2442335%6%47%
2091
16th to endDay
14%5%23323336%50%
1825
October1st to 15thDay
21%424423446%40%
1786
16th to endDay
17%5%245%3445%5%42%
1584
November1st to 15thDay
21%6%25%312346%42%
1581
16th to endDay
17%5%35%333336%43%
1620
December1st to 15thDay
18%7%35%5%33335%40%
1461
16th to endDay
22%9%35%324445%35%
1536
January1st to 15thNight
16%8%35%433345%41%
2506
16th to endNight
16%9%35%5%23445%39%
2688
February1st to 15thNight
14%8%35%5%35%5%47%36%
2195
16th to endNight
17%8%3442335%5%41%
1893
March1st to 15thNight
19%7%25%425%35%5%37%
2148
16th to endNight
16%6%35%43433443%
2042
April1st to 15thNight
18%8%25%5%24446%38%
1796
16th to endNight
22%4145%35%245%39%
1659
May1st to 15thNight
20%6%35%434446%34%
1620
16th to endNight
20%6%25%42345%8%35%
1540
June1st to 15thNight
24%7%2342435%6%33%
1440
16th to endNight
16%425%42445%9%39%
1440
July1st to 15thNight
12%5%35%435%449%40%
1440
16th to endNight
12%6%25%5%36%5%5%8%39%
1514
August1st to 15thNight
11%4135%35%6%6%7%42%
1591
16th to endNight
12%5%15%5%3446%7%44%
1848
September1st to 15thNight
13%5%1442435%6%48%
1869
16th to endNight
14%414313237%52%
1825
October1st to 15thNight
19%6%24422445%42%
1842
16th to endNight
20%5%24424446%40%
2288
November1st to 15thNight
16%6%15%423345%44%
2277
16th to endNight
17%6%245%24346%41%
2340
December1st to 15thNight
19%7%35%324445%39%
2496
16th to endNight
19%7%26%423445%37%
2688

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
43%5%12%23%12%3
1433
16th to endDay
41%313%26%13%1
1536
February1st to 15thDay
48%5%12%20%11%
1660
16th to endDay
45%411%20%14%2
1580
March1st to 15thDay
49%5%11%17%12%2
1812
16th to endDay
44%39%20%15%6%
2179
April1st to 15thDay
45%410%18%16%3
2152
16th to endDay
43%5%7%21%17%3
2301
May1st to 15thDay
53%48%16%14%2
2332
16th to endDay
43%6%14%21%12%2
2587
June1st to 15thDay
50%6%13%18%9%1
2520
16th to endDay
44%7%13%20%13%1
2520
July1st to 15thDay
39%9%12%22%15%1
2371
16th to endDay
40%7%15%22%11%2
2487
August1st to 15thDay
40%8%14%22%12%1
2341
16th to endDay
33%8%12%26%17%1
2351
September1st to 15thDay
36%5%12%22%21%1
2091
16th to endDay
36%48%24%23%2
1825
October1st to 15thDay
44%49%23%14%3
1786
16th to endDay
41%5%11%24%13%1
1584
November1st to 15thDay
44%411%23%14%1
1581
16th to endDay
43%412%21%16%1
1620
December1st to 15thDay
47%414%16%16%
1461
16th to endDay
51%412%18%11%
1536
January1st to 15thNight
45%412%21%13%2
2506
16th to endNight
46%411%19%15%2
2688
February1st to 15thNight
47%413%19%12%2
2203
16th to endNight
44%310%23%14%3
1893
March1st to 15thNight
47%5%10%19%14%3
2148
16th to endNight
44%49%17%19%5%
2043
April1st to 15thNight
46%49%19%17%2
1796
16th to endNight
47%49%18%16%4
1659
May1st to 15thNight
48%5%10%16%15%3
1620
16th to endNight
47%7%15%18%10%1
1542
June1st to 15thNight
50%6%11%20%10%
1440
16th to endNight
40%7%13%21%15%1
1440
July1st to 15thNight
39%7%13%25%14%
1360
16th to endNight
40%8%13%26%10%1
1418
August1st to 15thNight
37%8%13%24%14%2
1581
16th to endNight
36%6%12%24%18%
1848
September1st to 15thNight
36%5%12%25%19%1
1869
16th to endNight
34%47%25%27%1
1825
October1st to 15thNight
42%411%22%15%3
1842
16th to endNight
43%5%13%24%13%
2288
November1st to 15thNight
41%5%12%22%16%2
2277
16th to endNight
43%5%11%23%13%2
2340
December1st to 15thNight
47%413%21%12%
2496
16th to endNight
48%5%12%21%12%
2688

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
15%30%28%25%1
60
16th to endDay
25%25%35%14%
64
February1st to 15thDay
25%17%36%17%2
225
16th to endDay
17%20%34%22%4
239
March1st to 15thDay
24%21%34%15%4
270
16th to endDay
22%19%35%14%6%1
288
April1st to 15thDay
23%15%32%18%8%
270
16th to endDay
22%12%35%20%6%2
270
May1st to 15thDay
34%12%28%14%9%1
288
16th to endDay
21%9%35%26%6%
331
June1st to 15thDay
23%8%37%19%10%
315
16th to endDay
18%7%40%25%5%2
315
July1st to 15thDay
18%430%31%13%1
305
16th to endDay
13%6%28%33%15%2
326
August1st to 15thDay
14%5%29%31%16%3
313
16th to endDay
13%426%31%17%6%
332
September1st to 15thDay
16%8%29%25%14%4
315
16th to endDay
17%6%27%21%13%13%
257
October1st to 15thDay
26%9%23%21%13%6%
252
16th to endDay
20%15%34%22%8%
240
November1st to 15thDay
24%10%31%20%10%2
235
16th to endDay
25%17%28%17%10%1
240
December1st to 15thDay
20%23%39%11%4
81
16th to endDay
29%18%39%12%
64
January1st to 15thNight
20%18%40%17%2
720
16th to endNight
22%19%36%17%2
768
February1st to 15thNight
19%19%39%20%1
704
16th to endNight
22%17%37%18%4
631
March1st to 15thNight
23%17%37%18%2
720
16th to endNight
20%16%35%20%7%
768
April1st to 15thNight
21%16%35%22%4
718
16th to endNight
23%11%34%25%5%
579
May1st to 15thNight
24%9%34%23%6%1
540
16th to endNight
23%6%37%25%7%
420
June1st to 15thNight
25%5%29%28%9%1
360
16th to endNight
18%429%38%8%
360
July1st to 15thNight
13%225%43%12%1
340
16th to endNight
14%225%40%16%
376
August1st to 15thNight
13%126%40%16%
510
16th to endNight
14%321%38%20%2
702
September1st to 15thNight
17%230%30%16%1
720
16th to endNight
17%424%27%22%4
661
October1st to 15thNight
22%8%28%25%12%1
660
16th to endNight
22%12%33%23%6%
704
November1st to 15thNight
18%12%33%24%10%1
700
16th to endNight
21%17%30%22%7%1
720
December1st to 15thNight
24%14%36%19%4
720
16th to endNight
24%18%38%16%1
768
Page generated at 2017-09-17 12:05:47. Version ac04

Copyright 2017 A. Danko


Veasey Memorial Park Clear Sky Chart | Charts Home