Oneida
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oneida clear sky chart from 2005-11-06 to 2026-05-02.

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	14% 9% 3 7% 5% 5% 5% 4 6% 7% 36%	131698
	Night	14% 9% 3 7% 4 4 4 3 5% 7% 39%	130798
Transparency	Day	45% 7% 11% 21% 14% 3	135411
	Night	43% 6% 11% 21% 15% 3	135141
Seeing	Day	21% 13% 24% 21% 14% 6%	16673
	Night	19% 11% 22% 28% 18% 3	26774

By Month

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	18% 13% 7% 11% 4 4 4 3 4 5% 28%	5258
	11th to 20th	Day	13% 9% 6% 14% 3 3 3 3 3 4 39%	5280
	21st to end	Day	20% 11% 5% 7% 5% 3 3 3 4 6% 33%	5797
February	1st to 10th	Day	16% 13% 5% 8% 5% 5% 4 3 4 5% 32%	2100
	11th to 20th	Day	22% 12% 4 9% 5% 3 3 3 4 5% 30%	2048
	21st to end	Day	20% 12% 4 8% 3 4 4 2 5% 5% 34%	1730
March	1st to 10th	Day	18% 14% 4 7% 4 4 4 3 4 5% 32%	4645
	11th to 20th	Day	13% 9% 4 6% 4 3 4 3 4 6% 44%	5090
	21st to end	Day	15% 8% 2 6% 4 5% 5% 3 5% 6% 41%	5586
April	1st to 10th	Day	13% 8% 3 6% 5% 5% 4 4 6% 8% 39%	2441
	11th to 20th	Day	14% 8% 3 6% 5% 4 4 4 5% 7% 42%	2494
	21st to end	Day	16% 7% 2 6% 5% 4 5% 4 6% 7% 38%	2729
May	1st to 10th	Day	18% 11% 3 8% 6% 5% 6% 4 6% 8% 25%	5875
	11th to 20th	Day	15% 9% 4 9% 6% 6% 5% 5% 6% 7% 28%	5861
	21st to end	Day	15% 8% 3 8% 5% 5% 5% 5% 6% 8% 34%	6433
June	1st to 10th	Day	11% 7% 2 7% 6% 6% 6% 5% 6% 9% 35%	2600
	11th to 20th	Day	6% 6% 2 6% 5% 6% 6% 6% 7% 10% 39%	2600
	21st to end	Day	8% 6% 2 6% 5% 5% 6% 6% 8% 12% 37%	2600
July	1st to 10th	Day	8% 5% 2 6% 6% 6% 6% 5% 8% 10% 37%	5900
	11th to 20th	Day	11% 6% 2 8% 7% 6% 7% 5% 8% 11% 29%	5900
	21st to end	Day	15% 8% 3 8% 6% 6% 6% 5% 8% 10% 23%	6424
August	1st to 10th	Day	9% 5% 3 6% 5% 5% 5% 5% 7% 10% 39%	4234
	11th to 20th	Day	9% 5% 2 6% 6% 5% 7% 5% 8% 10% 36%	4042
	21st to end	Day	7% 4 1 4 4 5% 5% 4 7% 8% 51%	4312
September	1st to 10th	Day	14% 6% 2 6% 5% 4 6% 4 5% 6% 40%	2250
	11th to 20th	Day	13% 5% 3 6% 5% 5% 5% 4 6% 8% 40%	2200
	21st to end	Day	16% 5% 2 6% 3 4 4 4 5% 6% 44%	2200
October	1st to 10th	Day	10% 6% 2 5% 4 4 4 3 5% 6% 52%	2200
	11th to 20th	Day	13% 6% 2 5% 3 4 3 3 4 6% 51%	2070
	21st to end	Day	18% 7% 2 4 4 3 3 3 5% 7% 45%	2119
November	1st to 10th	Day	12% 7% 2 6% 3 3 4 3 5% 6% 51%	1852
	11th to 20th	Day	12% 9% 2 6% 4 3 4 4 4 6% 45%	1890
	21st to end	Day	14% 11% 3 6% 5% 3 4 3 4 6% 40%	1890
December	1st to 10th	Day	14% 12% 3 8% 5% 4 4 3 4 5% 39%	3020
	11th to 20th	Day	21% 16% 5% 7% 4 4 4 3 4 5% 26%	3463
	21st to end	Day	17% 14% 5% 8% 5% 4 4 4 6% 7% 27%	4565
January	1st to 10th	Night	16% 14% 5% 11% 4 3 3 3 4 5% 33%	7635
	11th to 20th	Night	15% 11% 4 9% 5% 4 3 2 3 4 40%	7680
	21st to end	Night	17% 13% 4 9% 4 4 3 2 3 4 36%	8369
February	1st to 10th	Night	18% 10% 4 9% 5% 4 4 4 5% 6% 31%	2520
	11th to 20th	Night	22% 12% 4 8% 4 3 3 3 4 5% 31%	2458
	21st to end	Night	21% 12% 4 8% 4 4 3 3 4 6% 31%	2076
March	1st to 10th	Night	17% 15% 3 7% 4 3 4 3 4 6% 34%	5412
	11th to 20th	Night	12% 8% 2 5% 3 4 4 3 5% 7% 47%	5090
	21st to end	Night	14% 8% 3 8% 5% 4 5% 4 5% 7% 38%	5588
April	1st to 10th	Night	13% 7% 3 5% 4 5% 3 4 6% 7% 43%	2195
	11th to 20th	Night	14% 7% 2 6% 4 3 4 3 5% 7% 45%	2075
	21st to end	Night	13% 7% 2 6% 6% 4 3 4 6% 7% 42%	1890
May	1st to 10th	Night	16% 9% 3 8% 5% 5% 6% 5% 7% 10% 27%	4042
	11th to 20th	Night	16% 9% 3 9% 6% 6% 5% 4 6% 8% 28%	4032
	21st to end	Night	14% 7% 3 6% 4 5% 5% 4 6% 8% 38%	4421
June	1st to 10th	Night	8% 6% 2 7% 5% 6% 5% 5% 6% 10% 42%	1800
	11th to 20th	Night	5% 4 1 4 4 4 6% 5% 8% 11% 47%	1800
	21st to end	Night	6% 5% 2 5% 5% 5% 6% 6% 7% 12% 41%	1800
July	1st to 10th	Night	8% 5% 2 5% 4 5% 6% 5% 8% 10% 42%	4058
	11th to 20th	Night	10% 6% 2 6% 4 4 5% 5% 7% 11% 40%	4057
	21st to end	Night	11% 7% 3 9% 6% 6% 6% 5% 7% 11% 29%	4427
August	1st to 10th	Night	8% 6% 2 6% 4 4 4 4 7% 9% 46%	2915
	11th to 20th	Night	9% 6% 2 6% 4 3 4 4 6% 9% 45%	3003
	21st to end	Night	5% 3 1 3 3 3 4 3 5% 9% 60%	3586
September	1st to 10th	Night	10% 6% 2 6% 4 4 4 4 6% 8% 46%	2130
	11th to 20th	Night	11% 6% 2 7% 5% 3 4 3 6% 7% 47%	2200
	21st to end	Night	13% 5% 2 6% 4 4 3 3 5% 5% 51%	2200
October	1st to 10th	Night	11% 5% 1 4 3 3 3 2 4 6% 58%	2200
	11th to 20th	Night	15% 5% 2 5% 3 3 4 3 4 6% 51%	2330
	21st to end	Night	15% 8% 2 5% 3 3 3 3 3 6% 49%	2718
November	1st to 10th	Night	11% 8% 2 6% 4 3 3 2 4 6% 50%	2666
	11th to 20th	Night	13% 9% 3 5% 3 3 4 3 4 7% 45%	2730
	21st to end	Night	15% 12% 3 6% 4 3 4 3 4 5% 42%	2730
December	1st to 10th	Night	16% 14% 5% 10% 5% 4 3 3 3 4 35%	4380
	11th to 20th	Night	21% 13% 6% 9% 3 3 3 2 4 4 32%	4952
	21st to end	Night	16% 14% 5% 8% 5% 5% 5% 4 5% 7% 25%	6633

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	59% 5% 8% 19% 10% 1	5259
	11th to 20th	Day	50% 3 4 17% 23% 3	5280
	21st to end	Day	52% 4 8% 22% 12% 2	5797
February	1st to 10th	Day	55% 5% 7% 16% 16% 2	2100
	11th to 20th	Day	57% 4 7% 18% 11% 3	2058
	21st to end	Day	53% 4 8% 16% 15% 4	1730
March	1st to 10th	Day	53% 4 5% 14% 15% 8%	4645
	11th to 20th	Day	41% 5% 6% 22% 20% 6%	5090
	21st to end	Day	43% 6% 9% 28% 14% 1	5586
April	1st to 10th	Day	42% 7% 11% 23% 14% 3	2441
	11th to 20th	Day	42% 5% 9% 20% 21% 3	2494
	21st to end	Day	44% 8% 10% 25% 12% 1	2729
May	1st to 10th	Day	54% 9% 11% 18% 8% 1	5910
	11th to 20th	Day	53% 8% 13% 18% 8%	5865
	21st to end	Day	46% 9% 11% 18% 14% 2	6447
June	1st to 10th	Day	43% 9% 13% 21% 13% 1	2600
	11th to 20th	Day	37% 11% 15% 20% 15% 2	2600
	21st to end	Day	36% 12% 16% 19% 14% 4	2600
July	1st to 10th	Day	38% 10% 16% 22% 12% 1	5835
	11th to 20th	Day	45% 11% 19% 20% 5% 1	5831
	21st to end	Day	52% 10% 15% 18% 4	6240
August	1st to 10th	Day	36% 9% 16% 28% 10%	4221
	11th to 20th	Day	37% 10% 16% 24% 13%	4081
	21st to end	Day	29% 8% 13% 37% 12% 1	4311
September	1st to 10th	Day	43% 8% 10% 18% 18% 4	2250
	11th to 20th	Day	42% 7% 11% 22% 17% 2	2200
	21st to end	Day	38% 8% 10% 21% 19% 4	2200
October	1st to 10th	Day	25% 4 7% 22% 35% 7%	3590
	11th to 20th	Day	24% 3 10% 23% 30% 9%	3349
	21st to end	Day	32% 4 9% 26% 20% 10%	3395
November	1st to 10th	Day	33% 5% 9% 21% 27% 4	1852
	11th to 20th	Day	39% 5% 6% 22% 22% 5%	1890
	21st to end	Day	46% 4 7% 20% 20% 3	1890
December	1st to 10th	Day	47% 5% 5% 19% 22% 1	3020
	11th to 20th	Day	60% 5% 7% 15% 11% 2	3460
	21st to end	Day	54% 6% 12% 19% 8% 1	4565
January	1st to 10th	Night	54% 4 12% 20% 9% 1	7636
	11th to 20th	Night	50% 3 4 18% 21% 4	7680
	21st to end	Night	53% 3 7% 16% 17% 4	8369
February	1st to 10th	Night	52% 6% 10% 18% 13% 2	2520
	11th to 20th	Night	57% 4 6% 17% 12% 4	2459
	21st to end	Night	55% 4 8% 16% 15% 3	2076
March	1st to 10th	Night	52% 4 8% 16% 15% 5%	5412
	11th to 20th	Night	37% 4 8% 24% 19% 8%	5090
	21st to end	Night	45% 5% 11% 25% 12% 1	5588
April	1st to 10th	Night	39% 6% 11% 24% 17% 3	2195
	11th to 20th	Night	39% 5% 10% 22% 20% 5%	2075
	21st to end	Night	41% 7% 11% 27% 13% 1	1890
May	1st to 10th	Night	50% 8% 14% 20% 7% 1	4069
	11th to 20th	Night	53% 8% 14% 18% 7%	4033
	21st to end	Night	41% 10% 14% 22% 13%	4429
June	1st to 10th	Night	37% 8% 14% 25% 14% 2	1800
	11th to 20th	Night	26% 11% 20% 25% 17% 1	1800
	21st to end	Night	33% 11% 16% 23% 15% 3	1800
July	1st to 10th	Night	34% 10% 19% 23% 13% 1	4015
	11th to 20th	Night	36% 9% 23% 24% 6% 2	4006
	21st to end	Night	47% 11% 18% 19% 5% 1	4297
August	1st to 10th	Night	32% 8% 15% 31% 13%	2904
	11th to 20th	Night	33% 8% 18% 29% 12% 1	3030
	21st to end	Night	21% 6% 13% 42% 17% 2	3586
September	1st to 10th	Night	34% 9% 13% 19% 18% 6%	2130
	11th to 20th	Night	36% 8% 11% 24% 19% 2	2200
	21st to end	Night	35% 7% 10% 21% 24% 3	2200
October	1st to 10th	Night	26% 4 6% 25% 32% 7%	3590
	11th to 20th	Night	24% 4 7% 25% 25% 15%	3790
	21st to end	Night	26% 3 8% 24% 25% 13%	4379
November	1st to 10th	Night	36% 4 7% 22% 23% 7%	2666
	11th to 20th	Night	39% 4 8% 20% 23% 6%	2730
	21st to end	Night	45% 4 6% 24% 18% 3	2730
December	1st to 10th	Night	54% 4 6% 17% 18% 1	4380
	11th to 20th	Night	56% 4 6% 18% 14% 2	4954
	21st to end	Night	56% 7% 12% 16% 9%	6633

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	32% 24% 32% 10% 1 1	330
	11th to 20th	Day	39% 29% 20% 10% 2	330
	21st to end	Day	30% 30% 30% 8% 1	363
February	1st to 10th	Day	32% 25% 29% 13% 2	330
	11th to 20th	Day	45% 26% 23% 5% 1	330
	21st to end	Day	40% 21% 33% 5% 1	273
March	1st to 10th	Day	30% 27% 30% 11% 2	356
	11th to 20th	Day	29% 24% 26% 16% 3 1	540
	21st to end	Day	27% 22% 29% 16% 5% 1	594
April	1st to 10th	Day	28% 15% 29% 18% 9% 1	540
	11th to 20th	Day	21% 19% 32% 17% 10% 1	532
	21st to end	Day	22% 15% 32% 18% 11% 1	540
May	1st to 10th	Day	23% 17% 29% 18% 8% 4	507
	11th to 20th	Day	16% 13% 27% 24% 12% 7%	527
	21st to end	Day	16% 10% 23% 23% 18% 10%	573
June	1st to 10th	Day	15% 8% 23% 25% 21% 9%	530
	11th to 20th	Day	8% 5% 19% 30% 24% 12%	530
	21st to end	Day	8% 6% 23% 29% 21% 13%	530
July	1st to 10th	Day	13% 4 15% 25% 26% 17%	525
	11th to 20th	Day	9% 6% 16% 26% 24% 18%	524
	21st to end	Day	15% 5% 13% 28% 26% 14%	576
August	1st to 10th	Day	14% 3 16% 27% 25% 15%	526
	11th to 20th	Day	13% 6% 16% 29% 23% 13%	519
	21st to end	Day	12% 3 10% 30% 27% 18%	583
September	1st to 10th	Day	13% 3 17% 25% 30% 12%	530
	11th to 20th	Day	13% 5% 12% 29% 29% 12%	530
	21st to end	Day	20% 6% 18% 29% 20% 7%	530
October	1st to 10th	Day	13% 7% 21% 28% 24% 7%	530
	11th to 20th	Day	16% 12% 25% 27% 17% 3	530
	21st to end	Day	25% 11% 27% 26% 10% 2	502
November	1st to 10th	Day	20% 14% 36% 21% 8% 2	330
	11th to 20th	Day	22% 20% 37% 18% 3	330
	21st to end	Day	22% 19% 36% 16% 6%	330
December	1st to 10th	Day	31% 22% 32% 12% 3	330
	11th to 20th	Day	28% 20% 34% 13% 4 1	330
	21st to end	Day	31% 23% 32% 11% 3	363
January	1st to 10th	Night	24% 23% 28% 21% 4	840
	11th to 20th	Night	29% 22% 25% 20% 3	840
	21st to end	Night	24% 18% 35% 21% 2	924
February	1st to 10th	Night	26% 18% 31% 23% 2	840
	11th to 20th	Night	31% 20% 32% 16% 1	823
	21st to end	Night	32% 21% 28% 18% 2	692
March	1st to 10th	Night	24% 16% 30% 24% 5%	840
	11th to 20th	Night	25% 17% 29% 22% 6% 1	840
	21st to end	Night	24% 15% 28% 25% 7%	924
April	1st to 10th	Night	20% 16% 27% 26% 10%	725
	11th to 20th	Night	19% 12% 30% 28% 11%	623
	21st to end	Night	18% 9% 30% 32% 11% 1	630
May	1st to 10th	Night	17% 9% 27% 31% 15% 2	603
	11th to 20th	Night	16% 8% 20% 34% 19% 4	591
	21st to end	Night	9% 3 20% 30% 31% 6%	650
June	1st to 10th	Night	10% 4 15% 36% 31% 4	600
	11th to 20th	Night	5% 2 15% 37% 34% 8%	600
	21st to end	Night	8% 3 11% 39% 32% 8%	600
July	1st to 10th	Night	11% 2 9% 28% 42% 8%	585
	11th to 20th	Night	8% 2 9% 26% 45% 9%	582
	21st to end	Night	9% 2 9% 31% 42% 8%	657
August	1st to 10th	Night	12% 3 7% 27% 44% 7%	597
	11th to 20th	Night	11% 2 8% 33% 39% 7%	594
	21st to end	Night	11% 1 6% 32% 40% 11%	660
September	1st to 10th	Night	12% 2 9% 29% 38% 8%	730
	11th to 20th	Night	13% 3 11% 29% 37% 6%	800
	21st to end	Night	16% 3 16% 32% 27% 6%	800
October	1st to 10th	Night	12% 7% 15% 29% 32% 7%	800
	11th to 20th	Night	18% 8% 20% 33% 19% 2	800
	21st to end	Night	18% 11% 23% 31% 15% 2	880
November	1st to 10th	Night	16% 10% 20% 35% 16% 3	820
	11th to 20th	Night	19% 15% 26% 30% 9% 1	840
	21st to end	Night	23% 14% 25% 29% 9%	840
December	1st to 10th	Night	27% 17% 25% 25% 6%	840
	11th to 20th	Night	25% 16% 27% 26% 5% 1	840
	21st to end	Night	29% 16% 26% 25% 4	924

Page generated at 2026-04-29 02:21:45. Version ac07

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