New Paltz
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Paltz clear sky chart from 2005-11-05 to 2018-02-14.

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
36%
15540
18%
48799
10%
15509
45%
15509
22%
31990

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
26%
780
18%
2716
8%
776
40%
776
19%
1741
January16th to endNight
25%
832
18%
2834
7%
832
39%
832
19%
1816
February1st to 15thNight
21%
760
15%
2419
4%
757
34%
757
17%
1671
February16th to endNight
22%
631
21%
1893
8%
631
38%
631
21%
1244
March1st to 15thNight
25%
720
17%
2154
8%
720
36%
720
19%
1469
March16th to endNight
27%
768
22%
1992
9%
768
37%
768
24%
1365
April1st to 15thNight
23%
718
16%
1796
5%
718
29%
718
21%
1303
April16th to endNight
30%
690
17%
1770
4%
690
37%
690
25%
1228
May1st to 15thNight
31%
475
18%
1555
10%
475
40%
475
19%
1037
May16th to endNight
45%
374
14%
1497
13%
374
51%
374
19%
936
June1st to 15thNight
46%
360
13%
1440
12%
360
55%
360
17%
931
June16th to endNight
58%
360
14%
1440
17%
360
64%
360
27%
815
July1st to 15thNight
60%
340
13%
1360
18%
340
61%
340
22%
805
July16th to endNight
60%
376
16%
1418
17%
354
65%
354
24%
826
August1st to 15thNight
61%
515
17%
1586
14%
513
64%
513
30%
982
August16th to endNight
62%
764
18%
1910
12%
764
63%
764
32%
1279
September1st to 15thNight
50%
720
22%
1800
12%
720
53%
720
33%
1186
September16th to endNight
53%
717
27%
1968
20%
717
59%
717
36%
1192
October1st to 15thNight
43%
720
21%
2112
16%
720
49%
720
26%
1373
October16th to endNight
32%
768
19%
2409
11%
768
43%
768
22%
1617
November1st to 15thNight
34%
760
19%
2472
10%
760
46%
760
22%
1591
November16th to endNight
31%
780
20%
2616
13%
780
43%
780
21%
1681
December1st to 15thNight
27%
780
14%
2730
6%
780
38%
780
16%
1892
December16th to endNight
21%
832
15%
2912
5%
832
34%
832
16%
2010

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
15%6%25%5%35%45%7%39%
49277
Night
15%6%2442445%6%41%
48969
Cloud CoverDay
15%6%25%5%3445%7%38%
49286
Night
16%6%25%424446%40%
48975
TransparencyDay
43%6%13%20%13%1
48965
Night
42%6%12%21%14%1
48799
SeeingDay
19%10%26%25%13%4
6161
Night
19%9%29%30%10%
15541

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
13%6%345%346%5%6%39%
1552
16th to endDay
12%8%26%5%3445%8%39%
1739
February1st to 15thDay
14%8%28%6%35%5%5%6%32%
1741
16th to endDay
14%7%345%35%447%38%
1580
March1st to 15thDay
16%8%36%5%245%46%36%
1793
16th to endDay
15%7%36%6%23345%41%
2232
April1st to 15thDay
17%8%345%3445%5%38%
2152
16th to endDay
17%5%25%424346%43%
2190
May1st to 15thDay
20%6%35%5%34446%34%
2406
16th to endDay
16%5%25%435%5%6%8%36%
2618
June1st to 15thDay
20%424435%5%6%8%34%
2520
16th to endDay
12%5%25%6%36%6%6%10%35%
2520
July1st to 15thDay
11%4246%36%6%7%8%37%
2520
16th to endDay
11%415%5%36%5%7%8%38%
2654
August1st to 15thDay
12%5%245%35%6%6%8%38%
2349
16th to endDay
11%4145%345%6%9%44%
2292
September1st to 15thDay
14%5%245%3445%6%43%
2160
16th to endDay
13%41342345%6%49%
1990
October1st to 15thDay
18%6%24433446%42%
1845
16th to endDay
19%6%25%435%446%38%
1814
November1st to 15thDay
16%7%24423346%43%
1716
16th to endDay
17%6%24324346%43%
1670
December1st to 15thDay
17%7%36%5%345%45%35%
1560
16th to endDay
18%8%345%25%5%46%34%
1664
January1st to 15thNight
15%5%35%43445%6%40%
2716
16th to endNight
13%8%345%2445%6%40%
2834
February1st to 15thNight
13%8%35%5%35%45%5%37%
2418
16th to endNight
13%7%35%5%24346%42%
1893
March1st to 15thNight
17%7%245%24346%39%
2141
16th to endNight
15%8%34323445%43%
1992
April1st to 15thNight
18%7%26%6%3345%6%35%
1796
16th to endNight
18%5%24424345%43%
1770
May1st to 15thNight
19%6%25%433446%38%
1555
16th to endNight
15%5%25%42446%8%40%
1495
June1st to 15thNight
20%424325%448%39%
1440
16th to endNight
12%3143245%6%10%46%
1440
July1st to 15thNight
12%424425%45%9%42%
1440
16th to endNight
9%5%146%45%47%8%42%
1514
August1st to 15thNight
10%4245%335%7%8%46%
1596
16th to endNight
14%41442445%6%45%
1910
September1st to 15thNight
14%5%34424346%47%
1800
16th to endNight
11%423423346%52%
1968
October1st to 15thNight
17%5%2442433445%
2112
16th to endNight
20%6%245%23335%42%
2409
November1st to 15thNight
15%7%25%433345%43%
2472
16th to endNight
18%5%25%5%2445%6%40%
2616
December1st to 15thNight
20%8%345%2435%6%36%
2730
16th to endNight
19%8%35%43435%6%35%
2912

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
14%6%245%346%5%6%39%
1552
16th to endDay
13%7%35%5%25%448%38%
1739
February1st to 15thDay
15%9%37%6%345%5%6%32%
1741
16th to endDay
14%7%345%35%45%7%38%
1580
March1st to 15thDay
17%8%36%4245%5%5%35%
1803
16th to endDay
16%7%36%6%23345%40%
2231
April1st to 15thDay
17%9%35%424345%38%
2152
16th to endDay
17%5%24434346%42%
2190
May1st to 15thDay
20%6%35%6%34446%34%
2406
16th to endDay
15%5%25%5%345%6%8%36%
2618
June1st to 15thDay
20%5%24425%5%5%8%34%
2520
16th to endDay
11%6%25%6%36%5%7%9%35%
2520
July1st to 15thDay
10%6%25%6%36%6%6%8%37%
2520
16th to endDay
11%425%6%35%6%7%9%38%
2654
August1st to 15thDay
12%5%25%5%35%6%6%8%38%
2349
16th to endDay
11%4244345%6%9%43%
2292
September1st to 15thDay
14%6%145%3445%7%42%
2160
16th to endDay
13%415%42435%6%49%
1990
October1st to 15thDay
17%7%14414446%41%
1845
16th to endDay
18%6%34435%45%5%38%
1814
November1st to 15thDay
17%6%34423247%43%
1716
16th to endDay
17%6%34424446%43%
1670
December1st to 15thDay
17%7%36%5%35%446%34%
1560
16th to endDay
18%7%35%5%345%5%6%33%
1664
January1st to 15thNight
16%6%25%5%2435%6%39%
2716
16th to endNight
13%9%25%5%2445%7%39%
2834
February1st to 15thNight
14%8%36%6%35%445%36%
2411
16th to endNight
14%7%35%5%35%346%41%
1893
March1st to 15thNight
17%7%345%3445%7%38%
2154
16th to endNight
15%7%35%423445%42%
1992
April1st to 15thNight
18%7%35%5%345%5%6%35%
1796
16th to endNight
18%5%245%23346%42%
1770
May1st to 15thNight
19%6%245%24445%39%
1555
16th to endNight
15%425%3345%6%7%39%
1495
June1st to 15thNight
19%5%2333445%8%38%
1440
16th to endNight
11%3234235%6%11%44%
1440
July1st to 15thNight
12%5%43435%5%5%8%42%
1440
16th to endNight
10%4245%36%47%8%41%
1514
August1st to 15thNight
10%4245%25%5%6%9%44%
1596
16th to endNight
13%4244246%46%44%
1910
September1st to 15thNight
14%434424347%46%
1800
16th to endNight
11%423333446%52%
1968
October1st to 15thNight
17%5%25%423335%45%
2112
16th to endNight
19%6%34423346%41%
2409
November1st to 15thNight
15%7%35%423346%43%
2472
16th to endNight
18%5%25%434446%40%
2616
December1st to 15thNight
20%8%35%5%24446%35%
2730
16th to endNight
19%8%26%434447%34%
2912

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
42%7%13%21%11%2
1553
16th to endDay
43%6%14%22%11%1
1739
February1st to 15thDay
50%6%12%17%10%1
1744
16th to endDay
44%5%13%22%12%1
1580
March1st to 15thDay
48%6%14%19%10%1
1803
16th to endDay
45%5%9%18%17%3
2232
April1st to 15thDay
47%5%10%20%13%3
2152
16th to endDay
42%5%8%21%18%3
2190
May1st to 15thDay
50%6%9%18%13%2
2406
16th to endDay
44%8%13%18%12%1
2622
June1st to 15thDay
46%7%15%18%10%1
2520
16th to endDay
43%8%13%22%10%1
2520
July1st to 15thDay
41%9%12%19%14%1
2371
16th to endDay
39%8%16%20%13%2
2487
August1st to 15thDay
39%9%15%21%13%
2335
16th to endDay
35%8%14%25%16%
2292
September1st to 15thDay
40%6%11%20%18%1
2160
16th to endDay
34%6%11%24%22%2
1990
October1st to 15thDay
42%6%12%21%14%1
1845
16th to endDay
46%5%12%21%12%1
1814
November1st to 15thDay
42%5%14%21%14%2
1716
16th to endDay
42%412%25%13%1
1670
December1st to 15thDay
49%6%15%18%9%1
1560
16th to endDay
50%6%15%17%9%
1664
January1st to 15thNight
44%5%14%20%13%2
2716
16th to endNight
43%5%13%22%12%2
2834
February1st to 15thNight
48%6%14%18%10%1
2419
16th to endNight
42%5%12%20%15%2
1893
March1st to 15thNight
46%5%13%20%12%2
2154
16th to endNight
43%5%10%20%17%3
1992
April1st to 15thNight
48%6%9%20%13%1
1796
16th to endNight
42%6%8%19%19%2
1770
May1st to 15thNight
46%5%10%18%16%2
1555
16th to endNight
41%8%15%19%12%1
1497
June1st to 15thNight
44%7%13%20%11%1
1440
16th to endNight
32%8%16%28%12%1
1440
July1st to 15thNight
36%8%13%24%13%1
1360
16th to endNight
35%7%15%24%13%3
1418
August1st to 15thNight
33%9%15%25%15%1
1586
16th to endNight
36%8%11%24%18%
1910
September1st to 15thNight
38%5%11%25%18%
1800
16th to endNight
32%5%9%23%27%1
1968
October1st to 15thNight
42%5%10%22%17%1
2112
16th to endNight
44%5%12%23%12%
2409
November1st to 15thNight
43%412%20%15%3
2472
16th to endNight
44%414%23%11%1
2616
December1st to 15thNight
49%6%14%18%10%
2730
16th to endNight
49%6%14%17%11%
2912

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
21%22%27%23%5%
90
16th to endDay
24%10%42%21%
113
February1st to 15thDay
23%24%35%15%1
177
16th to endDay
20%16%33%25%4
239
March1st to 15thDay
23%18%26%25%5%
270
16th to endDay
19%13%33%24%5%2
288
April1st to 15thDay
23%14%31%18%10%1
270
16th to endDay
19%12%29%22%10%5%
270
May1st to 15thDay
31%12%22%21%9%2
288
16th to endDay
18%9%25%27%14%4
331
June1st to 15thDay
24%9%24%25%14%2
315
16th to endDay
15%8%29%26%16%2
315
July1st to 15thDay
14%426%33%16%4
305
16th to endDay
13%322%31%23%6%
326
August1st to 15thDay
14%420%31%17%12%
313
16th to endDay
12%316%29%24%13%
332
September1st to 15thDay
18%8%18%25%18%10%
315
16th to endDay
13%423%21%20%17%
314
October1st to 15thDay
22%5%17%27%21%5%
315
16th to endDay
19%13%28%25%11%
309
November1st to 15thDay
20%10%24%30%12%2
280
16th to endDay
19%13%31%25%7%2
200
December1st to 15thDay
20%23%26%18%11%
90
16th to endDay
22%19%44%12%
96
January1st to 15thNight
19%12%37%27%3
780
16th to endNight
19%12%37%29%2
832
February1st to 15thNight
19%13%39%26%1
760
16th to endNight
18%14%40%22%3
631
March1st to 15thNight
22%15%33%25%3
720
16th to endNight
19%16%35%20%8%
768
April1st to 15thNight
23%12%36%24%3
718
16th to endNight
20%13%31%25%8%
690
May1st to 15thNight
21%10%33%27%7%
475
16th to endNight
17%227%39%12%1
375
June1st to 15thNight
19%5%22%36%14%
360
16th to endNight
14%120%45%16%
360
July1st to 15thNight
14%117%45%19%
340
16th to endNight
11%319%40%23%1
376
August1st to 15thNight
12%17%44%21%2
515
16th to endNight
15%112%38%27%4
764
September1st to 15thNight
17%322%35%19%2
720
16th to endNight
13%422%30%24%5%
717
October1st to 15thNight
20%5%22%32%16%1
720
16th to endNight
23%9%30%29%6%
768
November1st to 15thNight
19%8%31%28%10%1
760
16th to endNight
21%9%31%27%8%1
780
December1st to 15thNight
23%11%31%26%6%
780
16th to endNight
25%10%38%23%2
832
Page generated at 2018-02-15 10:58:51. Version ac04

Copyright 2018 A. Danko


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