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 2024-10-24.

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% 9% 3 7% 5% 4 5% 4 6% 7% 34%	101307
	Night	18% 9% 3 7% 4 4 4 4 5% 7% 35%	97456
Transparency	Day	27% 47% 6% 12% 6% 1	101063
	Night	27% 48% 6% 12% 6% 1	97319
Seeing	Day	26% 14% 26% 20% 11% 4	14817
	Night	24% 13% 26% 26% 10% 1	23976

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	13% 13% 6% 8% 5% 5% 5% 4 6% 6% 31%	2517
	11th to 20th	Day	15% 13% 7% 11% 6% 4 4 4 5% 5% 25%	2520
	21st to end	Day	22% 15% 5% 8% 5% 4 4 3 4 5% 25%	3064
February	1st to 10th	Day	17% 11% 4 8% 6% 5% 5% 4 7% 7% 26%	1710
	11th to 20th	Day	14% 10% 3 9% 5% 5% 5% 4 5% 7% 33%	1778
	21st to end	Day	19% 10% 3 9% 5% 4 4 3 6% 6% 30%	1570
March	1st to 10th	Day	24% 12% 3 8% 5% 3 3 3 4 4 31%	3116
	11th to 20th	Day	11% 12% 4 8% 6% 4 5% 4 6% 7% 35%	3443
	21st to end	Day	21% 10% 2 6% 4 3 4 3 5% 6% 36%	4062
April	1st to 10th	Day	18% 11% 3 7% 5% 4 3 3 5% 6% 34%	2280
	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	24% 8% 3 6% 4 4 4 5% 6% 6% 30%	1902
November	1st to 10th	Day	14% 9% 2 4 4 3 4 4 5% 7% 44%	1671
	11th to 20th	Day	17% 11% 3 7% 5% 5% 4 4 5% 5% 37%	1710
	21st to end	Day	17% 10% 3 7% 6% 3 4 4 5% 7% 34%	1530
December	1st to 10th	Day	20% 11% 5% 8% 5% 4 4 4 6% 6% 27%	1520
	11th to 20th	Day	22% 11% 4 8% 4 4 3 3 4 5% 31%	1906
	21st to end	Day	21% 16% 6% 10% 5% 5% 4 3 5% 4 21%	2772
January	1st to 10th	Night	16% 10% 5% 8% 4 4 4 4 5% 8% 32%	4429
	11th to 20th	Night	14% 10% 6% 12% 6% 5% 5% 4 5% 6% 28%	4440
	21st to end	Night	23% 12% 4 9% 6% 4 5% 3 5% 5% 24%	4591
February	1st to 10th	Night	16% 11% 4 6% 5% 5% 5% 4 6% 6% 32%	2470
	11th to 20th	Night	13% 10% 3 9% 5% 5% 6% 4 7% 8% 31%	2286
	21st to end	Night	19% 9% 2 7% 5% 4 4 4 6% 7% 33%	1884
March	1st to 10th	Night	23% 12% 3 6% 4 3 3 4 5% 5% 32%	3724
	11th to 20th	Night	12% 12% 4 7% 5% 5% 5% 4 6% 6% 34%	3512
	21st to end	Night	16% 10% 3 8% 5% 4 4 4 4 5% 37%	3569
April	1st to 10th	Night	18% 9% 3 8% 6% 5% 4 4 6% 6% 31%	1900
	11th to 20th	Night	19% 8% 3 6% 4 4 5% 3 5% 7% 37%	1875
	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	23% 9% 2 5% 3 3 4 3 5% 8% 34%	2519
November	1st to 10th	Night	14% 7% 2 6% 3 4 4 4 6% 5% 44%	2407
	11th to 20th	Night	19% 7% 2 6% 4 4 4 4 6% 7% 38%	2470
	21st to end	Night	15% 10% 3 6% 5% 4 4 3 6% 7% 37%	2645
December	1st to 10th	Night	21% 11% 4 6% 4 5% 5% 4 6% 7% 28%	2660
	11th to 20th	Night	20% 11% 4 7% 4 4 5% 3 5% 7% 29%	3288
	21st to end	Night	23% 13% 5% 8% 4 4 4 3 5% 6% 24%	4884

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	35% 36% 7% 16% 4 1	2518
	11th to 20th	Day	40% 37% 5% 13% 4 1	2520
	21st to end	Day	42% 38% 6% 10% 3	3064
February	1st to 10th	Day	20% 66% 5% 7% 3	1710
	11th to 20th	Day	18% 64% 2 10% 6%	1787
	21st to end	Day	18% 64% 4 9% 4 1	1570
March	1st to 10th	Day	39% 39% 4 11% 6% 1	3119
	11th to 20th	Day	29% 40% 8% 19% 4 1	3443
	21st to end	Day	30% 39% 4 8% 16% 3	4062
April	1st to 10th	Day	22% 64% 3 7% 4 1	2280
	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	19% 60% 3 9% 6% 2	1905
	11th to 20th	Day	16% 60% 5% 11% 7% 1	1900
	21st to end	Day	21% 61% 4 10% 4 1	1902
November	1st to 10th	Day	20% 59% 5% 10% 5% 1	1671
	11th to 20th	Day	17% 60% 4 10% 9% 1	1710
	21st to end	Day	19% 60% 7% 10% 3 1	1530
December	1st to 10th	Day	24% 60% 6% 5% 4 1	1520
	11th to 20th	Day	31% 49% 7% 10% 3	1906
	21st to end	Day	47% 36% 2 10% 4	2772
January	1st to 10th	Night	33% 36% 8% 16% 5% 2	4429
	11th to 20th	Night	38% 37% 7% 13% 5%	4440
	21st to end	Night	45% 38% 4 10% 3 1	4591
February	1st to 10th	Night	17% 64% 6% 9% 3 1	2470
	11th to 20th	Night	18% 64% 3 8% 6% 1	2288
	21st to end	Night	16% 64% 4 9% 5% 1	1884
March	1st to 10th	Night	37% 40% 4 11% 7% 1	3734
	11th to 20th	Night	31% 40% 8% 15% 6%	3513
	21st to end	Night	33% 40% 3 10% 12% 2	3569
April	1st to 10th	Night	21% 65% 3 7% 4	1900
	11th to 20th	Night	15% 65% 4 8% 7%	1875
	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	19% 60% 4 11% 6% 1	2270
	11th to 20th	Night	15% 60% 6% 11% 7% 1	2280
	21st to end	Night	20% 61% 3 10% 5%	2519
November	1st to 10th	Night	20% 59% 5% 9% 7% 1	2407
	11th to 20th	Night	16% 60% 4 10% 8% 1	2470
	21st to end	Night	19% 60% 7% 10% 4	2645
December	1st to 10th	Night	23% 61% 5% 8% 3	2660
	11th to 20th	Night	30% 49% 6% 9% 6% 1	3288
	21st to end	Night	42% 36% 7% 12% 4	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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	33% 20% 31% 12% 4 1	180
	11th to 20th	Day	44% 20% 23% 11% 2 1	180
	21st to end	Day	32% 22% 31% 10% 3 2	281
February	1st to 10th	Day	35% 24% 31% 9% 2	270
	11th to 20th	Day	37% 25% 29% 8% 2	386
	21st to end	Day	35% 19% 29% 14% 3	382
March	1st to 10th	Day	32% 20% 28% 17% 3	460
	11th to 20th	Day	34% 23% 26% 13% 4 1	460
	21st to end	Day	32% 23% 27% 10% 5% 2	506
April	1st to 10th	Day	35% 18% 27% 15% 5% 1	460
	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	32% 13% 23% 21% 8% 2	453
November	1st to 10th	Day	24% 13% 23% 23% 14% 3	365
	11th to 20th	Day	31% 19% 24% 19% 6% 1	370
	21st to end	Day	33% 16% 32% 13% 5% 1	190
December	1st to 10th	Day	32% 22% 27% 12% 6% 1	180
	11th to 20th	Day	39% 18% 28% 11% 4	180
	21st to end	Day	30% 23% 25% 16% 6% 1	198
January	1st to 10th	Night	27% 22% 31% 18% 3	760
	11th to 20th	Night	31% 17% 28% 21% 3	760
	21st to end	Night	23% 22% 34% 18% 3	836
February	1st to 10th	Night	28% 17% 33% 20% 2	760
	11th to 20th	Night	28% 24% 31% 15% 1	743
	21st to end	Night	31% 21% 29% 16% 4	628
March	1st to 10th	Night	28% 18% 33% 17% 4	760
	11th to 20th	Night	28% 20% 28% 20% 4	760
	21st to end	Night	26% 19% 32% 18% 5%	836
April	1st to 10th	Night	28% 18% 30% 20% 4	760
	11th to 20th	Night	26% 14% 30% 22% 7%	751
	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	29% 14% 27% 23% 7%	805
November	1st to 10th	Night	20% 14% 28% 27% 11% 1	740
	11th to 20th	Night	27% 17% 26% 23% 7% 1	760
	21st to end	Night	22% 18% 30% 23% 6% 1	760
December	1st to 10th	Night	30% 18% 27% 19% 5%	760
	11th to 20th	Night	27% 20% 29% 20% 4	760
	21st to end	Night	30% 17% 32% 18% 3	836

Page generated at 2024-10-21 02:20:04. Version ac07

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