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 2026-10-29.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	16% 7% 2 6% 4 4 5% 4 6% 8% 38%	149661
	Night	17% 7% 3 6% 4 4 4 3 5% 6% 40%	142392
Transparency	Day	42% 7% 13% 22% 14% 2	153164
	Night	43% 6% 13% 21% 15% 2	146965
Seeing	Day	20% 14% 28% 23% 10% 3	17453
	Night	20% 10% 31% 29% 9% 1	26502

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	11% 8% 4 8% 5% 5% 5% 4 4 6% 39%	4661
	11th to 20th	Day	13% 9% 4 8% 5% 4 4 4 5% 6% 38%	4650
	21st to end	Day	14% 8% 2 6% 5% 4 5% 4 5% 7% 41%	5464
February	1st to 10th	Day	14% 10% 2 9% 5% 5% 4 4 5% 6% 36%	1890
	11th to 20th	Day	13% 8% 2 7% 5% 5% 5% 4 5% 6% 38%	2029
	21st to end	Day	18% 9% 3 6% 4 4 5% 3 5% 6% 38%	1730
March	1st to 10th	Day	21% 8% 2 6% 4 4 4 3 4 5% 39%	4576
	11th to 20th	Day	14% 7% 3 6% 4 4 3 3 5% 6% 44%	4873
	21st to end	Day	19% 7% 2 7% 5% 4 5% 3 5% 5% 38%	6054
April	1st to 10th	Day	18% 9% 3 6% 5% 3 4 3 5% 7% 37%	2520
	11th to 20th	Day	16% 8% 2 6% 5% 4 4 3 5% 6% 40%	2494
	21st to end	Day	20% 6% 2 6% 4 4 4 4 5% 6% 40%	2571
May	1st to 10th	Day	26% 6% 2 5% 4 4 4 4 5% 7% 33%	7716
	11th to 20th	Day	18% 6% 2 6% 4 4 4 3 5% 8% 39%	8221
	21st to end	Day	22% 7% 2 5% 4 5% 5% 4 7% 9% 30%	9060
June	1st to 10th	Day	16% 5% 2 6% 5% 5% 5% 4 7% 9% 37%	2940
	11th to 20th	Day	15% 5% 2 6% 4 5% 4 4 8% 9% 37%	2940
	21st to end	Day	13% 5% 2 6% 5% 5% 5% 5% 6% 9% 37%	2940
July	1st to 10th	Day	14% 6% 2 6% 4 5% 6% 4 7% 9% 36%	8280
	11th to 20th	Day	8% 4 2 6% 5% 5% 5% 5% 8% 12% 41%	8280
	21st to end	Day	14% 6% 2 6% 4 4 4 3 5% 8% 41%	8993
August	1st to 10th	Day	15% 6% 3 8% 6% 6% 6% 5% 7% 9% 30%	6281
	11th to 20th	Day	12% 5% 2 6% 4 4 4 5% 6% 10% 42%	5488
	21st to end	Day	12% 5% 2 6% 4 5% 5% 4 7% 10% 41%	6080
September	1st to 10th	Day	13% 6% 2 6% 5% 4 5% 4 5% 7% 44%	2520
	11th to 20th	Day	13% 4 2 4 4 4 4 3 5% 7% 50%	2434
	21st to end	Day	18% 5% 1 5% 4 5% 4 4 6% 7% 41%	2310
October	1st to 10th	Day	19% 5% 2 5% 3 4 4 3 4 6% 44%	2181
	11th to 20th	Day	14% 6% 2 6% 4 4 4 3 5% 7% 43%	2100
	21st to end	Day	21% 6% 2 6% 4 4 5% 3 5% 5% 39%	2097
November	1st to 10th	Day	12% 8% 2 6% 4 4 3 2 4 6% 49%	1851
	11th to 20th	Day	16% 7% 1 5% 4 4 4 4 5% 6% 43%	1890
	21st to end	Day	17% 9% 2 7% 4 4 4 3 5% 7% 39%	1753
December	1st to 10th	Day	16% 7% 3 7% 5% 5% 5% 4 5% 7% 38%	2680
	11th to 20th	Day	23% 7% 2 4 2 3 4 4 5% 6% 41%	3066
	21st to end	Day	18% 9% 3 7% 5% 5% 5% 4 5% 6% 33%	4048
January	1st to 10th	Night	13% 9% 3 8% 5% 5% 4 4 5% 6% 38%	8234
	11th to 20th	Night	14% 9% 4 9% 6% 5% 4 3 5% 6% 35%	8235
	21st to end	Night	14% 8% 3 6% 5% 4 4 4 6% 6% 40%	8699
February	1st to 10th	Night	14% 9% 3 6% 4 5% 4 4 5% 6% 39%	2730
	11th to 20th	Night	15% 8% 3 7% 6% 4 4 4 5% 6% 38%	2475
	21st to end	Night	16% 9% 2 8% 4 4 4 4 4 5% 40%	2076
March	1st to 10th	Night	20% 7% 3 5% 3 3 3 3 5% 6% 41%	5484
	11th to 20th	Night	15% 9% 3 6% 4 4 4 3 5% 6% 41%	5289
	21st to end	Night	18% 10% 3 6% 5% 4 4 3 4 5% 39%	5119
April	1st to 10th	Night	20% 8% 2 8% 5% 4 4 3 6% 6% 33%	2100
	11th to 20th	Night	19% 7% 2 7% 5% 4 4 3 5% 7% 38%	2075
	21st to end	Night	21% 7% 3 5% 4 4 3 3 4 5% 42%	2048
May	1st to 10th	Night	28% 7% 2 5% 3 3 4 3 5% 7% 32%	5225
	11th to 20th	Night	20% 6% 2 7% 5% 4 4 3 5% 7% 36%	4639
	21st to end	Night	21% 8% 2 7% 4 4 5% 3 6% 6% 34%	5114
June	1st to 10th	Night	16% 5% 2 6% 4 4 4 4 5% 8% 42%	1680
	11th to 20th	Night	15% 7% 2 5% 4 4 4 5% 6% 9% 40%	1680
	21st to end	Night	13% 4 2 5% 3 5% 4 4 7% 11% 43%	1680
July	1st to 10th	Night	15% 6% 2 5% 4 4 5% 4 6% 10% 38%	4680
	11th to 20th	Night	10% 6% 3 7% 5% 5% 5% 4 7% 9% 40%	4680
	21st to end	Night	13% 6% 2 5% 5% 4 4 4 5% 7% 45%	5084
August	1st to 10th	Night	18% 6% 3 7% 5% 5% 5% 4 6% 8% 33%	3824
	11th to 20th	Night	14% 6% 2 6% 4 5% 4 5% 5% 7% 41%	4552
	21st to end	Night	13% 5% 2 6% 4 4 4 3 5% 7% 48%	5045
September	1st to 10th	Night	15% 6% 3 5% 4 4 4 3 4 7% 46%	2100
	11th to 20th	Night	13% 4 2 5% 4 4 3 3 4 6% 53%	2185
	21st to end	Night	18% 6% 2 5% 4 3 3 3 5% 7% 43%	2310
October	1st to 10th	Night	19% 7% 2 5% 4 3 3 3 4 5% 44%	2436
	11th to 20th	Night	16% 6% 2 5% 3 4 3 3 4 5% 48%	2520
	21st to end	Night	23% 6% 2 6% 4 3 3 3 4 6% 41%	2918
November	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 5% 6% 47%	2667
	11th to 20th	Night	18% 7% 2 5% 4 3 4 4 4 6% 43%	2730
	21st to end	Night	16% 6% 2 6% 5% 3 4 4 5% 6% 43%	2861
December	1st to 10th	Night	15% 9% 2 6% 4 4 4 3 5% 5% 43%	4720
	11th to 20th	Night	26% 8% 2 5% 3 3 3 3 5% 5% 38%	5348
	21st to end	Night	20% 10% 3 7% 4 4 3 3 5% 6% 35%	7150

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	44% 6% 12% 23% 13% 2	4662
	11th to 20th	Day	44% 6% 10% 19% 15% 6%	4680
	21st to end	Day	41% 5% 11% 25% 16% 1	5464
February	1st to 10th	Day	48% 6% 13% 19% 14% 1	1890
	11th to 20th	Day	45% 6% 11% 21% 13% 3	2038
	21st to end	Day	47% 5% 13% 21% 12% 2	1730
March	1st to 10th	Day	48% 5% 11% 18% 11% 8%	4579
	11th to 20th	Day	38% 7% 15% 27% 9% 4	4873
	21st to end	Day	47% 6% 8% 13% 21% 6%	6054
April	1st to 10th	Day	47% 6% 11% 19% 13% 4	2520
	11th to 20th	Day	43% 7% 12% 20% 15% 2	2494
	21st to end	Day	45% 5% 10% 21% 15% 3	2571
May	1st to 10th	Day	50% 6% 12% 17% 13% 1	7728
	11th to 20th	Day	44% 7% 13% 23% 13% 1	8225
	21st to end	Day	47% 8% 14% 20% 10% 1	9061
June	1st to 10th	Day	41% 9% 15% 20% 14% 1	2940
	11th to 20th	Day	41% 8% 16% 22% 11% 1	2940
	21st to end	Day	41% 9% 13% 23% 13% 1	2940
July	1st to 10th	Day	43% 8% 14% 19% 15% 1	8210
	11th to 20th	Day	34% 8% 16% 29% 13%	8205
	21st to end	Day	40% 6% 12% 24% 17% 1	8795
August	1st to 10th	Day	48% 9% 16% 16% 10% 1	6267
	11th to 20th	Day	35% 8% 20% 29% 7%	5524
	21st to end	Day	36% 8% 15% 28% 13% 1	6080
September	1st to 10th	Day	39% 6% 13% 23% 17% 2	2520
	11th to 20th	Day	34% 6% 11% 25% 22% 2	2434
	21st to end	Day	41% 7% 13% 20% 16% 2	2310
October	1st to 10th	Day	39% 6% 8% 20% 23% 3	3480
	11th to 20th	Day	33% 5% 9% 27% 23% 3	3340
	21st to end	Day	32% 5% 15% 25% 19% 4	3322
November	1st to 10th	Day	37% 5% 14% 25% 17% 2	1851
	11th to 20th	Day	41% 7% 11% 22% 17% 2	1890
	21st to end	Day	45% 5% 15% 25% 9% 2	1753
December	1st to 10th	Day	45% 6% 15% 25% 8% 1	2680
	11th to 20th	Day	44% 5% 14% 22% 13% 2	3066
	21st to end	Day	49% 7% 10% 19% 13% 1	4048
January	1st to 10th	Night	46% 5% 12% 19% 15% 2	8234
	11th to 20th	Night	49% 6% 13% 15% 12% 5%	8280
	21st to end	Night	44% 4 11% 20% 18% 3	8699
February	1st to 10th	Night	46% 6% 13% 21% 12% 1	2730
	11th to 20th	Night	46% 6% 12% 17% 15% 3	2477
	21st to end	Night	45% 6% 10% 22% 13% 4	2076
March	1st to 10th	Night	44% 6% 12% 18% 15% 6%	5494
	11th to 20th	Night	41% 7% 16% 22% 10% 3	5290
	21st to end	Night	48% 5% 7% 14% 23% 4	5119
April	1st to 10th	Night	49% 7% 11% 18% 13% 2	2100
	11th to 20th	Night	45% 7% 11% 17% 18% 1	2075
	21st to end	Night	44% 7% 9% 20% 17% 3	2048
May	1st to 10th	Night	52% 6% 13% 17% 12% 1	5231
	11th to 20th	Night	47% 7% 13% 20% 12% 1	4640
	21st to end	Night	49% 7% 12% 22% 9% 1	5115
June	1st to 10th	Night	40% 6% 11% 24% 17% 2	1680
	11th to 20th	Night	38% 10% 16% 24% 10% 1	1680
	21st to end	Night	34% 10% 15% 25% 14% 1	1680
July	1st to 10th	Night	41% 8% 16% 20% 14% 2	4640
	11th to 20th	Night	39% 8% 14% 25% 13% 1	4632
	21st to end	Night	37% 6% 12% 26% 17% 1	4967
August	1st to 10th	Night	48% 9% 14% 17% 11% 1	3814
	11th to 20th	Night	41% 8% 18% 27% 7%	4582
	21st to end	Night	35% 6% 14% 30% 14% 1	5045
September	1st to 10th	Night	39% 6% 12% 25% 17% 1	2100
	11th to 20th	Night	33% 6% 11% 25% 24% 1	2185
	21st to end	Night	40% 6% 11% 21% 21% 1	2310
October	1st to 10th	Night	41% 6% 11% 22% 18% 2	3904
	11th to 20th	Night	29% 5% 9% 29% 26% 2	4019
	21st to end	Night	34% 5% 13% 29% 17% 2	4643
November	1st to 10th	Night	38% 6% 11% 24% 19% 3	2667
	11th to 20th	Night	43% 4 11% 21% 17% 3	2730
	21st to end	Night	41% 6% 16% 27% 10% 1	2861
December	1st to 10th	Night	43% 5% 14% 29% 8% 1	4720
	11th to 20th	Night	49% 5% 14% 16% 15% 2	5348
	21st to end	Night	49% 6% 11% 17% 13% 3	7150

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	25% 20% 30% 16% 8%	220
	11th to 20th	Day	28% 24% 30% 15% 3	220
	21st to end	Day	22% 22% 37% 14% 4 1	305
February	1st to 10th	Day	27% 22% 35% 14% 3	330
	11th to 20th	Day	24% 22% 35% 17% 2	517
	21st to end	Day	26% 21% 34% 15% 3	446
March	1st to 10th	Day	26% 18% 31% 19% 5%	540
	11th to 20th	Day	24% 23% 31% 17% 4 1	540
	21st to end	Day	29% 20% 28% 17% 3 2	594
April	1st to 10th	Day	30% 19% 27% 15% 6% 2	540
	11th to 20th	Day	24% 24% 29% 14% 7% 2	532
	21st to end	Day	28% 16% 31% 18% 6% 1	540
May	1st to 10th	Day	31% 17% 26% 18% 6% 1	543
	11th to 20th	Day	17% 15% 35% 22% 10% 2	567
	21st to end	Day	21% 11% 26% 27% 11% 4	617
June	1st to 10th	Day	18% 13% 27% 26% 13% 4	570
	11th to 20th	Day	16% 15% 28% 26% 12% 2	570
	21st to end	Day	16% 12% 28% 28% 14% 3	570
July	1st to 10th	Day	14% 6% 24% 35% 17% 4	565
	11th to 20th	Day	12% 7% 24% 34% 18% 5%	564
	21st to end	Day	13% 7% 26% 33% 16% 4	620
August	1st to 10th	Day	13% 7% 21% 34% 17% 9%	566
	11th to 20th	Day	14% 6% 25% 30% 19% 7%	559
	21st to end	Day	10% 9% 28% 30% 16% 8%	627
September	1st to 10th	Day	18% 11% 22% 25% 18% 7%	570
	11th to 20th	Day	14% 6% 28% 24% 17% 12%	570
	21st to end	Day	20% 10% 26% 26% 13% 5%	570
October	1st to 10th	Day	24% 11% 22% 22% 15% 6%	570
	11th to 20th	Day	17% 14% 30% 25% 11% 3	570
	21st to end	Day	22% 14% 31% 21% 10% 2	511
November	1st to 10th	Day	17% 16% 28% 28% 9% 2	425
	11th to 20th	Day	23% 18% 28% 26% 5% 1	430
	21st to end	Day	22% 17% 31% 24% 5% 1	293
December	1st to 10th	Day	20% 24% 35% 14% 8%	220
	11th to 20th	Day	28% 20% 33% 15% 3	220
	21st to end	Day	21% 17% 38% 19% 5% 1	242
January	1st to 10th	Night	19% 15% 37% 27% 3	840
	11th to 20th	Night	22% 15% 35% 25% 3	840
	21st to end	Night	17% 13% 42% 24% 3	924
February	1st to 10th	Night	20% 15% 37% 26% 2	840
	11th to 20th	Night	22% 15% 41% 21% 1	823
	21st to end	Night	22% 14% 40% 21% 3	692
March	1st to 10th	Night	23% 16% 35% 23% 3	840
	11th to 20th	Night	21% 17% 35% 22% 5%	840
	21st to end	Night	22% 17% 36% 19% 5%	924
April	1st to 10th	Night	25% 16% 34% 21% 4	840
	11th to 20th	Night	20% 14% 36% 24% 6%	831
	21st to end	Night	24% 14% 30% 26% 6%	788
May	1st to 10th	Night	25% 13% 32% 24% 6%	622
	11th to 20th	Night	19% 8% 35% 33% 5%	414
	21st to end	Night	16% 7% 24% 40% 12% 1	455
June	1st to 10th	Night	16% 6% 26% 37% 15%	420
	11th to 20th	Night	17% 6% 25% 37% 15%	420
	21st to end	Night	14% 4 23% 43% 16%	420
July	1st to 10th	Night	14% 2 18% 45% 20% 1	410
	11th to 20th	Night	11% 4 23% 44% 17% 1	408
	21st to end	Night	11% 4 20% 46% 18% 1	460
August	1st to 10th	Night	14% 2 13% 47% 22% 2	485
	11th to 20th	Night	12% 4 17% 42% 22% 3	825
	21st to end	Night	15% 3 18% 38% 23% 2	924
September	1st to 10th	Night	17% 3 23% 37% 18% 2	840
	11th to 20th	Night	14% 4 22% 33% 23% 5%	840
	21st to end	Night	19% 7% 23% 33% 16% 2	840
October	1st to 10th	Night	23% 6% 26% 29% 15% 2	840
	11th to 20th	Night	18% 9% 28% 35% 9% 1	840
	21st to end	Night	25% 10% 30% 28% 7%	913
November	1st to 10th	Night	17% 9% 33% 31% 10%	820
	11th to 20th	Night	23% 12% 32% 26% 6% 1	840
	21st to end	Night	19% 11% 34% 28% 6% 1	840
December	1st to 10th	Night	23% 14% 34% 24% 5%	840
	11th to 20th	Night	25% 12% 34% 26% 4	840
	21st to end	Night	25% 12% 38% 23% 3	924

Page generated at 2026-10-26 04:37:52. Version ac07

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