New Paltz
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Paltz clear sky chart from 2005-11-06 to 2024-03-23.

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
34%
23257
17%
80782
10%
23170
44%
23170
20%
52727

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
24%
750
21%
4354
9%
737
40%
737
13%
2503
January11th to 20thNight
24%
758
17%
4358
6%
740
36%
740
10%
2719
January21st to endNight
22%
832
12%
4664
8%
814
38%
814
11%
3219
February1st to 10thNight
21%
760
16%
2470
5%
760
36%
760
18%
1668
February11th to 20thNight
17%
743
18%
2236
5%
740
33%
740
19%
1507
February21st to endNight
21%
628
21%
1884
8%
628
36%
628
20%
1275
March1st to 10thNight
23%
759
19%
2280
9%
759
36%
759
21%
1499
March11th to 20thNight
24%
760
19%
2177
8%
760
35%
760
21%
1474
March21st to endNight
23%
801
20%
2020
7%
801
33%
801
23%
1416
April1st to 10thNight
22%
720
17%
1800
4%
720
30%
720
20%
1306
April11th to 20thNight
27%
711
16%
1775
5%
711
33%
711
24%
1252
April21st to endNight
28%
676
17%
1756
6%
676
35%
676
22%
1250
May1st to 10thNight
27%
534
14%
1614
7%
534
33%
534
17%
1163
May11th to 20thNight
33%
354
19%
1416
14%
354
44%
354
18%
888
May21st to endNight
50%
388
15%
1551
16%
388
55%
388
20%
946
June1st to 10thNight
44%
360
17%
1440
17%
360
54%
360
20%
883
June11th to 20thNight
50%
360
13%
1440
15%
360
56%
360
20%
891
June21st to endNight
54%
360
15%
1440
18%
360
61%
360
25%
839
July1st to 10thNight
60%
350
14%
1400
20%
350
63%
350
23%
825
July11th to 20thNight
59%
348
15%
1392
19%
348
61%
348
22%
823
July21st to endNight
61%
394
17%
1486
20%
372
65%
372
25%
868
August1st to 10thNight
62%
415
18%
1479
17%
413
65%
413
26%
884
August11th to 20thNight
58%
705
14%
1769
10%
705
59%
705
27%
1260
August21st to endNight
55%
792
18%
1980
9%
792
57%
792
31%
1332
September1st to 10thNight
48%
720
20%
1800
10%
720
52%
720
31%
1215
September11th to 20thNight
51%
720
26%
1872
17%
720
56%
720
36%
1155
September21st to endNight
46%
720
24%
1980
17%
720
53%
720
31%
1261
October1st to 10thNight
38%
720
16%
2088
12%
720
43%
720
22%
1420
October11th to 20thNight
40%
720
21%
2160
13%
720
50%
720
26%
1396
October21st to endNight
28%
792
16%
2533
10%
792
38%
792
19%
1753
November1st to 10thNight
37%
740
22%
2407
13%
740
50%
740
25%
1481
November11th to 20thNight
30%
760
22%
2470
12%
760
43%
760
22%
1581
November21st to endNight
30%
760
20%
2588
11%
760
43%
760
23%
1599
December1st to 10thNight
25%
760
17%
2660
8%
760
37%
760
17%
1788
December11th to 20thNight
24%
760
14%
3215
4%
759
34%
759
13%
2149
December21st to endNight
21%
827
11%
4828
5%
817
36%
817
10%
3239

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
16%6%35%5%35%5%5%7%39%
78596
Night
17%7%35%5%3445%6%40%
81267
TransparencyDay
43%7%13%21%13%2
78301
Night
44%7%13%21%13%2
81096
SeeingDay
20%13%28%24%11%3
14008
Night
20%10%31%30%9%1
23284

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%8%34435%5%5%6%43%
2517
11th to 20thDay
15%9%5%8%7%445%6%6%32%
2520
21st to endDay
19%11%47%6%44446%32%
2946
February1st to 10thDay
15%10%47%6%445%5%6%34%
1710
11th to 20thDay
13%7%36%6%36%5%5%7%40%
1830
21st to endDay
19%8%45%445%45%6%36%
1570
March1st to 10thDay
14%8%47%5%35%45%6%40%
1897
11th to 20thDay
15%8%37%6%345%5%7%39%
2000
21st to endDay
19%8%36%6%25%44439%
2380
April1st to 10thDay
17%7%46%5%3446%7%37%
2160
11th to 20thDay
16%7%35%5%3445%6%42%
2134
21st to endDay
21%5%25%5%35%45%6%38%
2203
May1st to 10thDay
23%6%35%5%345%5%6%34%
2362
11th to 20thDay
18%5%25%5%35%5%6%8%38%
2478
21st to endDay
15%6%25%435%5%6%9%41%
2725
June1st to 10thDay
17%435%6%45%5%7%8%36%
2520
11th to 20thDay
15%5%36%5%45%5%7%9%37%
2520
21st to endDay
13%5%25%6%36%6%6%10%38%
2520
July1st to 10thDay
12%5%346%46%5%7%8%40%
2520
11th to 20thDay
11%425%6%36%6%8%10%41%
2520
21st to endDay
12%5%26%6%46%6%7%8%39%
2744
August1st to 10thDay
11%5%25%6%36%7%6%10%40%
2434
11th to 20thDay
12%5%25%6%447%7%9%39%
2126
21st to endDay
13%5%25%5%345%6%9%43%
2376
September1st to 10thDay
14%6%36%5%35%5%5%6%42%
2160
11th to 20thDay
14%4245%34446%50%
2087
21st to endDay
17%5%144345%6%6%44%
1980
October1st to 10thDay
21%5%25%434446%42%
1870
11th to 20thDay
15%6%26%5%345%5%7%43%
1800
21st to endDay
24%6%25%5%35%446%36%
1821
November1st to 10thDay
13%7%35%423336%49%
1671
11th to 20thDay
18%6%25%435%45%6%43%
1710
21st to endDay
17%7%26%335%45%7%40%
1587
December1st to 10thDay
18%8%47%6%46%5%46%33%
1520
11th to 20thDay
24%6%24324437%41%
1906
21st to endDay
19%10%47%7%445%5%5%29%
2772
January1st to 10thNight
16%6%36%5%24446%43%
4429
11th to 20thNight
15%8%38%7%4445%6%36%
4440
21st to endNight
23%11%46%5%2445%5%32%
4692
February1st to 10thNight
15%9%36%5%35%45%6%39%
2470
11th to 20thNight
14%8%46%6%35%45%6%39%
2234
21st to endNight
17%8%36%434445%41%
1884
March1st to 10thNight
16%8%35%5%2445%8%41%
2270
11th to 20thNight
15%8%45%6%3445%6%40%
2176
21st to endNight
15%9%35%5%3445%6%40%
2020
April1st to 10thNight
18%8%37%6%3446%6%35%
1800
11th to 20thNight
19%5%35%6%34448%39%
1775
21st to endNight
22%6%345%34445%41%
1756
May1st to 10thNight
22%8%36%5%345%5%6%34%
1614
11th to 20thNight
17%6%26%5%345%5%7%39%
1415
21st to endNight
14%6%25%435%46%8%42%
1550
June1st to 10thNight
16%5%25%5%35%45%8%42%
1440
11th to 20thNight
15%6%25%425%5%5%9%42%
1440
21st to endNight
13%324435%5%6%11%44%
1440
July1st to 10thNight
13%5%34435%5%5%10%44%
1440
11th to 20thNight
12%5%25%5%36%5%7%9%41%
1440
21st to endNight
11%5%246%46%5%7%8%44%
1574
August1st to 10thNight
10%425%5%345%7%9%45%
1489
11th to 20thNight
12%6%26%6%5%5%6%6%7%39%
1769
21st to endNight
16%425%5%3445%8%44%
1980
September1st to 10thNight
15%5%35%4345%5%7%44%
1800
11th to 20thNight
14%423423346%54%
1872
21st to endNight
16%5%235%2445%7%47%
1980
October1st to 10thNight
21%7%35%5%24445%41%
2088
11th to 20thNight
16%6%24434446%46%
2160
21st to endNight
25%6%25%5%33446%38%
2533
November1st to 10thNight
13%6%25%5%345%5%6%47%
2407
11th to 20thNight
19%6%34434446%43%
2470
21st to endNight
16%5%25%5%2446%7%43%
2588
December1st to 10thNight
19%7%35%5%35%45%6%38%
2660
11th to 20thNight
22%8%35%43445%6%37%
3288
21st to endNight
23%10%35%5%33346%34%
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
38%8%15%30%8%1
2518
11th to 20thDay
49%9%12%21%8%2
2520
21st to endDay
55%6%10%19%8%1
2946
February1st to 10thDay
50%6%13%18%12%1
1710
11th to 20thDay
44%7%11%22%14%3
1839
21st to endDay
48%5%12%21%11%2
1570
March1st to 10thDay
44%6%13%21%12%3
1900
11th to 20thDay
44%7%11%23%13%2
2000
21st to endDay
48%6%8%16%17%5%
2380
April1st to 10thDay
46%6%11%20%13%4
2160
11th to 20thDay
42%6%11%21%16%3
2134
21st to endDay
47%6%10%20%14%4
2203
May1st to 10thDay
49%6%10%18%14%2
2362
11th to 20thDay
43%7%12%21%15%2
2482
21st to endDay
40%9%16%21%12%2
2725
June1st to 10thDay
42%9%16%19%12%1
2520
11th to 20thDay
42%9%15%22%10%1
2520
21st to endDay
41%9%13%24%12%1
2520
July1st to 10thDay
40%9%14%20%16%2
2450
11th to 20thDay
35%10%16%24%14%1
2445
21st to endDay
40%9%15%19%15%2
2591
August1st to 10thDay
37%10%15%24%12%1
2420
11th to 20thDay
38%11%17%23%11%
2126
21st to endDay
37%7%14%24%16%2
2376
September1st to 10thDay
41%7%13%22%16%2
2160
11th to 20thDay
35%6%11%23%23%2
2087
21st to endDay
38%8%12%22%17%3
1980
October1st to 10thDay
43%7%11%22%14%2
1870
11th to 20thDay
40%8%13%25%13%1
1800
21st to endDay
50%6%12%19%12%2
1821
November1st to 10thDay
37%5%14%25%16%2
1671
11th to 20thDay
42%7%12%21%16%2
1710
21st to endDay
44%5%15%25%9%2
1587
December1st to 10thDay
52%7%14%16%10%1
1520
11th to 20thDay
44%5%17%22%10%2
1906
21st to endDay
54%9%11%19%7%
2772
January1st to 10thNight
41%6%14%25%11%3
4429
11th to 20thNight
47%7%14%20%10%2
4440
21st to endNight
54%6%12%19%9%1
4692
February1st to 10thNight
46%6%14%21%11%1
2470
11th to 20thNight
45%6%12%17%16%4
2236
21st to endNight
45%6%11%22%13%4
1884
March1st to 10thNight
42%7%13%22%13%3
2280
11th to 20thNight
44%7%12%22%14%2
2177
21st to endNight
44%6%10%18%17%4
2020
April1st to 10thNight
48%7%11%19%13%2
1800
11th to 20thNight
44%7%11%18%19%1
1775
21st to endNight
45%7%9%20%14%4
1756
May1st to 10thNight
51%7%9%17%14%2
1614
11th to 20thNight
44%6%11%19%17%3
1416
21st to endNight
39%9%17%22%12%2
1551
June1st to 10thNight
42%7%11%23%16%2
1440
11th to 20thNight
38%11%16%25%10%1
1440
21st to endNight
33%10%15%26%15%1
1440
July1st to 10thNight
36%9%15%23%14%3
1400
11th to 20thNight
37%8%15%28%11%1
1392
21st to endNight
33%10%16%21%16%3
1486
August1st to 10thNight
34%10%15%26%14%1
1479
11th to 20thNight
41%10%16%22%11%
1769
21st to endNight
38%7%12%22%19%1
1980
September1st to 10thNight
39%6%13%25%16%1
1800
11th to 20thNight
33%5%11%24%25%1
1872
21st to endNight
36%6%11%23%23%1
1980
October1st to 10thNight
45%6%11%21%14%2
2088
11th to 20thNight
39%7%12%27%13%1
2160
21st to endNight
48%6%11%21%12%1
2533
November1st to 10thNight
38%6%11%22%19%3
2407
11th to 20thNight
44%412%21%15%4
2470
21st to endNight
40%6%16%27%10%1
2588
December1st to 10thNight
47%6%14%21%11%1
2660
11th to 20thNight
47%8%14%16%13%2
3288
21st to endNight
51%7%14%19%8%
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
26%19%28%19%9%
180
11th to 20thDay
26%22%33%16%31
180
21st to endDay
20%18%39%16%5%2
249
February1st to 10thDay
29%21%35%12%3
270
11th to 20thDay
23%22%37%17%1
438
21st to endDay
27%19%34%17%3
382
March1st to 10thDay
25%18%32%21%5%
460
11th to 20thDay
22%25%30%18%41
460
21st to endDay
29%17%29%19%43
470
April1st to 10thDay
27%19%28%16%7%3
420
11th to 20thDay
22%23%29%16%8%2
412
21st to endDay
30%15%28%19%6%2
420
May1st to 10thDay
31%15%27%18%7%2
423
11th to 20thDay
18%13%37%22%8%2
447
21st to endDay
19%11%22%29%14%5%
485
June1st to 10thDay
18%12%28%25%13%3
450
11th to 20thDay
15%13%29%27%13%2
450
21st to endDay
16%10%27%28%15%4
450
July1st to 10thDay
15%6%22%35%17%5%
445
11th to 20thDay
12%6%23%35%19%5%
444
21st to endDay
13%7%26%34%16%4
488
August1st to 10thDay
12%6%21%36%17%8%
446
11th to 20thDay
14%5%26%30%18%8%
439
21st to endDay
11%8%24%31%17%9%
495
September1st to 10thDay
20%10%19%25%19%8%
450
11th to 20thDay
15%7%30%21%16%11%
450
21st to endDay
18%10%26%27%14%6%
450
October1st to 10thDay
28%9%20%22%15%6%
450
11th to 20thDay
17%12%31%27%11%2
450
21st to endDay
26%14%29%22%9%1
415
November1st to 10thDay
18%13%25%31%11%3
365
11th to 20thDay
24%17%28%24%6%1
370
21st to endDay
19%15%30%28%6%1
247
December1st to 10thDay
21%22%34%14%8%
180
11th to 20thDay
28%20%33%17%2
180
21st to endDay
21%16%37%21%41
198
January1st to 10thNight
19%14%37%27%3
760
11th to 20thNight
23%13%35%26%3
760
21st to endNight
18%13%40%26%3
836
February1st to 10thNight
21%15%37%26%2
760
11th to 20thNight
20%15%43%21%1
743
21st to endNight
24%14%39%21%3
628
March1st to 10thNight
22%16%34%24%3
760
11th to 20thNight
21%16%37%22%5%
760
21st to endNight
21%15%37%20%6%
801
April1st to 10thNight
24%16%33%23%4
720
11th to 20thNight
20%13%36%25%7%
711
21st to endNight
25%14%29%26%6%
676
May1st to 10thNight
24%13%32%24%7%
534
11th to 20thNight
19%6%35%34%5%
354
21st to endNight
16%6%21%42%14%1
389
June1st to 10thNight
16%6%26%36%15%
360
11th to 20thNight
16%6%24%38%17%1
360
21st to endNight
13%323%45%16%
360
July1st to 10thNight
14%217%44%22%1
350
11th to 20thNight
12%419%45%18%1
348
21st to endNight
11%319%47%18%1
394
August1st to 10thNight
12%215%48%21%2
415
11th to 20thNight
12%316%42%23%3
705
21st to endNight
16%317%37%24%2
792
September1st to 10thNight
17%323%37%18%2
720
11th to 20thNight
15%424%31%21%5%
720
21st to endNight
17%7%24%34%16%2
720
October1st to 10thNight
25%7%24%29%14%2
720
11th to 20thNight
18%8%28%36%9%
720
21st to endNight
28%10%30%26%6%
792
November1st to 10thNight
16%9%33%31%11%1
740
11th to 20thNight
24%11%32%26%7%1
760
21st to endNight
19%11%34%29%7%1
760
December1st to 10thNight
24%13%34%23%6%
760
11th to 20thNight
25%11%34%27%4
760
21st to endNight
25%11%38%23%3
836
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