Narrowsburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Narrowsburg clear sky chart from 2005-11-06 to 2025-04-11.

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	17% 8% 3 8% 5% 4 5% 4 6% 7% 33%	113442
	Night	17% 9% 3 8% 5% 4 4 4 5% 7% 35%	114824
Transparency	Day	30% 41% 7% 13% 8% 1	116992
	Night	31% 40% 7% 13% 8% 1	119437
Seeing	Day	26% 14% 27% 19% 11% 4	15320
	Night	24% 13% 26% 25% 10% 1	24654

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% 12% 7% 20% 6% 4 4 3 4 5% 24%	3597
	11th to 20th	Day	14% 13% 6% 15% 7% 5% 5% 4 5% 5% 22%	3570
	21st to end	Day	18% 11% 4 8% 5% 4 5% 3 4 5% 32%	4392
February	1st to 10th	Day	17% 11% 4 8% 6% 5% 5% 4 7% 7% 27%	1800
	11th to 20th	Day	14% 10% 4 9% 5% 5% 5% 3 5% 7% 32%	1875
	21st to end	Day	19% 10% 3 9% 5% 4 4 3 6% 7% 30%	1650
March	1st to 10th	Day	21% 10% 4 8% 6% 4 4 3 4 4 33%	4476
	11th to 20th	Day	14% 9% 4 7% 6% 3 4 3 5% 6% 39%	4929
	21st to end	Day	18% 9% 2 6% 4 4 5% 4 6% 6% 35%	5824
April	1st to 10th	Day	19% 11% 3 7% 5% 4 3 3 6% 5% 33%	2400
	11th to 20th	Day	19% 9% 2 6% 4 5% 4 3 5% 6% 37%	2254
	21st to end	Day	18% 9% 2 8% 5% 5% 3 4 5% 6% 35%	2280
May	1st to 10th	Day	27% 8% 3 6% 4 4 4 3 5% 7% 31%	4244
	11th to 20th	Day	22% 8% 3 7% 5% 6% 5% 5% 6% 6% 28%	4398
	21st to end	Day	14% 5% 2 5% 4 4 5% 4 7% 9% 41%	4837
June	1st to 10th	Day	16% 6% 2 7% 6% 5% 5% 4 6% 10% 33%	2660
	11th to 20th	Day	16% 7% 3 6% 6% 5% 6% 5% 7% 8% 33%	2660
	21st to end	Day	15% 7% 2 7% 5% 5% 5% 5% 6% 9% 35%	2660
July	1st to 10th	Day	9% 6% 3 8% 6% 6% 6% 5% 7% 10% 34%	4440
	11th to 20th	Day	9% 6% 2 7% 5% 5% 6% 5% 7% 11% 37%	4440
	21st to end	Day	14% 7% 3 7% 6% 5% 6% 5% 7% 7% 33%	4814
August	1st to 10th	Day	21% 7% 3 7% 5% 5% 5% 4 7% 8% 28%	4175
	11th to 20th	Day	15% 6% 3 6% 4 5% 6% 5% 7% 9% 35%	3775
	21st to end	Day	17% 6% 1 5% 4 4 4 4 7% 10% 40%	4180
September	1st to 10th	Day	16% 7% 2 6% 4 5% 4 4 6% 7% 39%	2280
	11th to 20th	Day	14% 6% 2 5% 4 3 4 3 4 8% 46%	2244
	21st to end	Day	20% 6% 2 6% 5% 5% 4 3 6% 7% 37%	2090
October	1st to 10th	Day	19% 7% 2 7% 4 3 4 4 5% 7% 37%	1905
	11th to 20th	Day	16% 7% 2 7% 4 4 5% 3 7% 7% 38%	1900
	21st to end	Day	23% 8% 3 6% 4 4 4 5% 6% 6% 32%	1976
November	1st to 10th	Day	14% 9% 2 4 4 4 4 4 5% 7% 45%	1761
	11th to 20th	Day	16% 11% 3 6% 4 5% 4 4 5% 5% 37%	1800
	21st to end	Day	18% 10% 3 7% 6% 3 4 4 5% 7% 33%	1610
December	1st to 10th	Day	17% 10% 5% 12% 6% 5% 6% 4 5% 6% 24%	2600
	11th to 20th	Day	23% 11% 4 7% 4 4 3 3 4 5% 31%	2986
	21st to end	Day	19% 13% 5% 10% 5% 4 4 3 6% 6% 26%	3960
January	1st to 10th	Night	13% 9% 6% 16% 5% 4 4 3 5% 7% 27%	6349
	11th to 20th	Night	12% 10% 6% 15% 6% 6% 5% 4 5% 6% 26%	6315
	21st to end	Night	17% 9% 4 9% 6% 5% 6% 4 5% 6% 30%	6563
February	1st to 10th	Night	15% 11% 4 6% 5% 5% 5% 4 6% 6% 31%	2600
	11th to 20th	Night	13% 10% 3 9% 5% 5% 5% 4 7% 8% 31%	2409
	21st to end	Night	18% 9% 2 8% 5% 4 4 4 6% 7% 32%	1980
March	1st to 10th	Night	20% 10% 4 6% 4 3 3 4 6% 6% 35%	5364
	11th to 20th	Night	14% 10% 4 6% 5% 4 4 4 5% 6% 38%	5026
	21st to end	Night	17% 10% 3 8% 5% 5% 4 3 4 6% 35%	5107
April	1st to 10th	Night	19% 9% 3 8% 6% 5% 4 3 5% 6% 31%	2000
	11th to 20th	Night	19% 8% 3 6% 4 4 5% 3 5% 7% 37%	1882
	21st to end	Night	19% 7% 2 7% 4 3 4 4 5% 5% 40%	1900
May	1st to 10th	Night	29% 7% 2 6% 3 3 3 3 5% 6% 32%	2723
	11th to 20th	Night	22% 9% 3 6% 5% 4 3 4 4 7% 33%	2495
	21st to end	Night	14% 6% 2 6% 4 4 5% 4 7% 9% 38%	2738
June	1st to 10th	Night	17% 5% 2 5% 5% 4 4 4 6% 7% 41%	1520
	11th to 20th	Night	15% 6% 2 6% 3 4 3 3 4 9% 44%	1520
	21st to end	Night	11% 4 1 5% 4 4 6% 4 8% 10% 44%	1520
July	1st to 10th	Night	11% 6% 2 6% 5% 5% 5% 5% 6% 8% 41%	2520
	11th to 20th	Night	13% 6% 2 6% 4 5% 4 4 7% 10% 39%	2520
	21st to end	Night	16% 6% 2 6% 5% 4 5% 4 6% 8% 39%	2739
August	1st to 10th	Night	22% 7% 3 7% 5% 4 5% 4 5% 8% 31%	2751
	11th to 20th	Night	17% 6% 2 6% 4 4 4 4 5% 7% 41%	3007
	21st to end	Night	13% 5% 2 5% 3 4 4 3 6% 8% 47%	3476
September	1st to 10th	Night	16% 7% 1 4 4 4 4 4 5% 7% 44%	1900
	11th to 20th	Night	14% 6% 1 4 3 3 4 2 5% 6% 53%	1934
	21st to end	Night	18% 6% 2 6% 4 4 4 4 4 7% 41%	2090
October	1st to 10th	Night	22% 6% 2 6% 4 4 3 4 4 6% 40%	2270
	11th to 20th	Night	19% 7% 3 5% 3 3 3 3 4 7% 43%	2280
	21st to end	Night	22% 9% 2 5% 3 4 4 3 5% 8% 35%	2620
November	1st to 10th	Night	14% 7% 2 6% 3 4 4 4 6% 5% 45%	2537
	11th to 20th	Night	19% 7% 2 6% 4 4 3 4 6% 7% 39%	2600
	21st to end	Night	15% 10% 3 6% 5% 4 4 3 6% 7% 36%	2785
December	1st to 10th	Night	17% 11% 4 9% 4 5% 5% 3 5% 7% 30%	4580
	11th to 20th	Night	25% 10% 3 6% 4 3 4 3 4 5% 33%	5208
	21st to end	Night	22% 14% 5% 8% 5% 4 4 3 5% 6% 25%	6996

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	50% 26% 5% 15% 4 1	3598
	11th to 20th	Day	49% 27% 5% 11% 6% 2	3600
	21st to end	Day	41% 27% 7% 16% 8%	4392
February	1st to 10th	Day	22% 63% 5% 7% 4	1800
	11th to 20th	Day	21% 61% 2 10% 6%	1884
	21st to end	Day	20% 61% 4 10% 5% 1	1650
March	1st to 10th	Day	42% 28% 6% 11% 9% 4	4479
	11th to 20th	Day	33% 28% 11% 21% 4 3	4929
	21st to end	Day	36% 28% 6% 7% 18% 4	5824
April	1st to 10th	Day	24% 61% 3 7% 4 1	2400
	11th to 20th	Day	16% 65% 3 8% 6%	2254
	21st to end	Day	19% 65% 2 8% 5% 1	2280
May	1st to 10th	Day	35% 39% 7% 11% 6% 1	4258
	11th to 20th	Day	39% 39% 9% 11% 2	4402
	21st to end	Day	25% 40% 6% 18% 11%	4837
June	1st to 10th	Day	17% 65% 4 8% 5%	2660
	11th to 20th	Day	15% 65% 5% 9% 5%	2660
	21st to end	Day	17% 64% 3 10% 6%	2660
July	1st to 10th	Day	30% 38% 9% 15% 8%	4370
	11th to 20th	Day	28% 37% 11% 16% 8%	4365
	21st to end	Day	34% 35% 8% 13% 9% 1	4661
August	1st to 10th	Day	38% 37% 8% 11% 4	4161
	11th to 20th	Day	28% 38% 11% 19% 4	3812
	21st to end	Day	23% 37% 7% 25% 7%	4180
September	1st to 10th	Day	16% 61% 5% 11% 7%	2280
	11th to 20th	Day	16% 60% 3 10% 10% 1	2244
	21st to end	Day	20% 60% 5% 9% 6% 1	2090
October	1st to 10th	Day	28% 38% 3 15% 16% 2	3165
	11th to 20th	Day	23% 37% 4 18% 13% 4	3140
	21st to end	Day	15% 37% 12% 23% 10% 2	3240
November	1st to 10th	Day	20% 56% 6% 11% 6% 1	1761
	11th to 20th	Day	17% 57% 4 11% 10% 2	1800
	21st to end	Day	21% 57% 7% 10% 3 1	1610
December	1st to 10th	Day	43% 36% 7% 11% 3 1	2600
	11th to 20th	Day	40% 31% 8% 11% 9% 1	2986
	21st to end	Day	46% 26% 5% 13% 10% 1	3960
January	1st to 10th	Night	45% 26% 6% 14% 7% 1	6349
	11th to 20th	Night	46% 27% 9% 11% 6% 2	6360
	21st to end	Night	42% 28% 6% 9% 12% 2	6563
February	1st to 10th	Night	19% 61% 6% 9% 3 1	2600
	11th to 20th	Night	21% 61% 3 8% 6% 1	2411
	21st to end	Night	19% 61% 4 9% 5% 1	1980
March	1st to 10th	Night	38% 29% 8% 11% 12% 2	5374
	11th to 20th	Night	34% 28% 13% 16% 6% 3	5027
	21st to end	Night	40% 29% 3 12% 14% 2	5107
April	1st to 10th	Night	24% 61% 3 8% 4	2000
	11th to 20th	Night	16% 65% 4 8% 7%	1882
	21st to end	Night	17% 65% 3 8% 6% 1	1900
May	1st to 10th	Night	35% 40% 7% 15% 3 1	2729
	11th to 20th	Night	37% 41% 10% 11% 2	2496
	21st to end	Night	28% 41% 9% 14% 8% 1	2739
June	1st to 10th	Night	14% 65% 2 11% 8%	1520
	11th to 20th	Night	14% 65% 7% 10% 5%	1520
	21st to end	Night	14% 64% 5% 10% 7%	1520
July	1st to 10th	Night	28% 37% 12% 11% 12% 1	2480
	11th to 20th	Night	27% 36% 10% 18% 8%	2472
	21st to end	Night	32% 35% 8% 14% 10% 1	2651
August	1st to 10th	Night	39% 38% 8% 11% 3	2741
	11th to 20th	Night	29% 37% 9% 20% 5%	3035
	21st to end	Night	21% 37% 7% 28% 7%	3476
September	1st to 10th	Night	15% 60% 6% 12% 7% 1	1900
	11th to 20th	Night	13% 59% 5% 10% 11% 1	1934
	21st to end	Night	20% 59% 3 10% 7% 1	2090
October	1st to 10th	Night	31% 38% 5% 15% 11% 1	3790
	11th to 20th	Night	19% 36% 7% 16% 18% 3	3779
	21st to end	Night	20% 36% 11% 21% 11% 1	4306
November	1st to 10th	Night	20% 56% 5% 10% 8% 1	2537
	11th to 20th	Night	17% 57% 4 11% 10% 1	2600
	21st to end	Night	21% 57% 7% 11% 4	2785
December	1st to 10th	Night	36% 36% 8% 17% 2	4580
	11th to 20th	Night	40% 31% 7% 12% 9% 1	5208
	21st to end	Night	47% 26% 6% 11% 9% 1	6996

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	33% 22% 30% 11% 4 1	200
	11th to 20th	Day	44% 22% 23% 10% 2 1	200
	21st to end	Day	32% 24% 31% 9% 3 2	313
February	1st to 10th	Day	36% 25% 29% 8% 2	300
	11th to 20th	Day	39% 24% 28% 8% 1	423
	21st to end	Day	35% 19% 30% 13% 3	414
March	1st to 10th	Day	33% 20% 28% 16% 3	500
	11th to 20th	Day	33% 22% 27% 13% 4 1	500
	21st to end	Day	32% 24% 28% 11% 4 2	550
April	1st to 10th	Day	36% 19% 26% 14% 5% 1	500
	11th to 20th	Day	32% 19% 25% 12% 10% 2	452
	21st to end	Day	31% 15% 32% 14% 5% 3	460
May	1st to 10th	Day	35% 14% 24% 15% 9% 2	463
	11th to 20th	Day	24% 16% 26% 22% 9% 3	487
	21st to end	Day	20% 10% 28% 23% 14% 5%	529
June	1st to 10th	Day	20% 11% 29% 24% 11% 3	490
	11th to 20th	Day	21% 12% 23% 25% 16% 4	490
	21st to end	Day	19% 10% 31% 24% 11% 4	490
July	1st to 10th	Day	14% 5% 26% 31% 17% 7%	485
	11th to 20th	Day	13% 4 25% 30% 22% 5%	484
	21st to end	Day	16% 7% 31% 27% 13% 5%	532
August	1st to 10th	Day	15% 7% 24% 26% 20% 8%	486
	11th to 20th	Day	17% 6% 23% 27% 19% 8%	479
	21st to end	Day	16% 7% 26% 26% 15% 10%	539
September	1st to 10th	Day	21% 9% 23% 20% 17% 10%	490
	11th to 20th	Day	15% 7% 22% 24% 19% 14%	490
	21st to end	Day	24% 8% 26% 22% 15% 5%	490
October	1st to 10th	Day	28% 8% 23% 19% 18% 5%	490
	11th to 20th	Day	22% 15% 28% 23% 9% 2	490
	21st to end	Day	31% 13% 24% 21% 9% 2	479
November	1st to 10th	Day	23% 14% 25% 22% 13% 3	395
	11th to 20th	Day	30% 19% 24% 20% 6% 1	400
	21st to end	Day	35% 17% 31% 12% 4	210
December	1st to 10th	Day	32% 22% 29% 12% 6% 1	200
	11th to 20th	Day	41% 19% 26% 11% 5%	200
	21st to end	Day	30% 20% 25% 17% 7%	220
January	1st to 10th	Night	27% 23% 30% 17% 3	800
	11th to 20th	Night	30% 18% 28% 22% 3	800
	21st to end	Night	23% 22% 35% 18% 2	880
February	1st to 10th	Night	28% 18% 33% 20% 2	800
	11th to 20th	Night	30% 23% 31% 15% 1	783
	21st to end	Night	31% 21% 29% 16% 3	660
March	1st to 10th	Night	28% 18% 33% 17% 4	800
	11th to 20th	Night	28% 20% 28% 21% 4	800
	21st to end	Night	26% 19% 32% 18% 5%	880
April	1st to 10th	Night	30% 17% 30% 20% 4	800
	11th to 20th	Night	27% 14% 30% 22% 7%	754
	21st to end	Night	26% 16% 28% 23% 7%	760
May	1st to 10th	Night	32% 10% 25% 24% 7% 1	511
	11th to 20th	Night	20% 10% 30% 29% 11% 1	374
	21st to end	Night	17% 6% 21% 38% 18%	411
June	1st to 10th	Night	18% 6% 24% 36% 16% 1	380
	11th to 20th	Night	17% 5% 24% 35% 18%	380
	21st to end	Night	13% 3 27% 41% 16%	380
July	1st to 10th	Night	15% 3 15% 41% 23% 3	370
	11th to 20th	Night	13% 3 17% 44% 21% 2	368
	21st to end	Night	15% 4 18% 42% 20%	416
August	1st to 10th	Night	14% 1 18% 38% 25% 3	519
	11th to 20th	Night	16% 3 13% 40% 25% 3	696
	21st to end	Night	16% 4 16% 36% 25% 2	836
September	1st to 10th	Night	18% 4 23% 32% 21% 3	760
	11th to 20th	Night	18% 3 19% 31% 23% 5%	760
	21st to end	Night	21% 6% 21% 31% 18% 3	760
October	1st to 10th	Night	26% 8% 20% 26% 17% 3	760
	11th to 20th	Night	26% 9% 27% 29% 9% 1	760
	21st to end	Night	28% 13% 27% 24% 7%	836
November	1st to 10th	Night	20% 14% 29% 26% 11% 1	780
	11th to 20th	Night	27% 17% 26% 24% 7% 1	800
	21st to end	Night	23% 18% 30% 23% 6% 1	800
December	1st to 10th	Night	30% 18% 28% 19% 5%	800
	11th to 20th	Night	28% 20% 28% 21% 4	800
	21st to end	Night	30% 17% 31% 19% 3	880

Page generated at 2025-04-08 09:17:28. Version ac07

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