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 2024-07-31.

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	15% 9% 3 7% 5% 5% 5% 4 6% 7% 36%	89937
	Night	14% 9% 3 7% 4 4 4 4 5% 7% 39%	89857
Transparency	Day	46% 7% 10% 20% 14% 2	89711
	Night	44% 7% 11% 20% 16% 3	89687
Seeing	Day	21% 13% 24% 21% 15% 7%	14381
	Night	19% 11% 21% 28% 18% 3	24430

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	16% 13% 7% 10% 5% 5% 4 4 5% 6% 26%	2836
	11th to 20th	Day	18% 12% 6% 15% 4 5% 4 3 3 4 27%	2840
	21st to end	Day	23% 14% 5% 7% 4 3 3 3 4 5% 29%	3127
February	1st to 10th	Day	17% 13% 5% 8% 4 4 5% 3 4 5% 31%	1900
	11th to 20th	Day	21% 12% 4 9% 5% 3 3 3 4 5% 31%	1848
	21st to end	Day	21% 12% 3 8% 4 4 4 2 5% 5% 32%	1570
March	1st to 10th	Day	22% 14% 4 7% 4 4 4 3 4 5% 30%	3170
	11th to 20th	Day	15% 7% 3 6% 4 3 4 3 4 6% 45%	3480
	21st to end	Day	16% 10% 2 6% 5% 5% 5% 3 5% 6% 38%	3815
April	1st to 10th	Day	13% 8% 3 6% 5% 5% 3 4 6% 8% 39%	2209
	11th to 20th	Day	15% 8% 3 6% 5% 4 4 4 5% 6% 41%	2254
	21st to end	Day	16% 7% 2 6% 5% 4 5% 4 6% 7% 38%	2469
May	1st to 10th	Day	18% 9% 3 8% 5% 5% 5% 4 6% 7% 31%	4082
	11th to 20th	Day	17% 9% 3 8% 6% 5% 4 4 5% 6% 34%	4081
	21st to end	Day	11% 6% 3 8% 5% 4 5% 5% 6% 9% 38%	4476
June	1st to 10th	Day	11% 7% 2 7% 6% 6% 6% 5% 6% 9% 35%	2470
	11th to 20th	Day	6% 6% 2 6% 5% 6% 6% 5% 7% 10% 40%	2470
	21st to end	Day	8% 6% 2 6% 5% 5% 6% 6% 8% 11% 36%	2470
July	1st to 10th	Day	10% 6% 3 8% 7% 7% 7% 5% 9% 9% 28%	2470
	11th to 20th	Day	11% 5% 2 7% 7% 6% 7% 5% 8% 10% 31%	2470
	21st to end	Day	12% 8% 3 7% 6% 6% 5% 5% 8% 10% 29%	2679
August	1st to 10th	Day	11% 6% 3 7% 6% 6% 6% 6% 7% 11% 31%	2327
	11th to 20th	Day	12% 6% 2 7% 6% 6% 7% 5% 7% 10% 32%	2231
	21st to end	Day	11% 6% 2 6% 6% 7% 6% 4 8% 10% 35%	2376
September	1st to 10th	Day	15% 6% 2 6% 5% 4 6% 4 6% 7% 39%	2026
	11th to 20th	Day	14% 6% 3 7% 5% 5% 5% 4 6% 8% 38%	1980
	21st to end	Day	15% 5% 1 6% 3 4 4 4 5% 6% 46%	1980
October	1st to 10th	Day	10% 6% 2 5% 4 4 4 3 5% 6% 51%	1980
	11th to 20th	Day	14% 6% 2 6% 3 4 3 3 4 6% 49%	1864
	21st to end	Day	18% 7% 2 4 4 3 3 3 5% 7% 45%	1908
November	1st to 10th	Day	12% 6% 1 5% 3 3 4 3 5% 6% 53%	1672
	11th to 20th	Day	13% 9% 2 5% 4 3 4 3 5% 6% 46%	1710
	21st to end	Day	15% 10% 3 6% 4 3 4 3 4 6% 42%	1710
December	1st to 10th	Day	20% 13% 3 8% 5% 4 3 3 4 5% 32%	1710
	11th to 20th	Day	15% 14% 4 7% 4 5% 5% 4 5% 5% 32%	2153
	21st to end	Day	15% 16% 4 7% 4 4 4 4 6% 7% 28%	3124
January	1st to 10th	Night	17% 17% 6% 9% 5% 3 3 3 4 5% 28%	4109
	11th to 20th	Night	18% 14% 4 8% 6% 5% 3 3 3 4 33%	4120
	21st to end	Night	20% 15% 4 7% 4 4 3 2 4 5% 32%	4528
February	1st to 10th	Night	17% 10% 4 9% 5% 4 4 4 5% 6% 31%	2280
	11th to 20th	Night	21% 11% 5% 8% 4 3 3 3 4 5% 32%	2218
	21st to end	Night	22% 13% 4 8% 5% 4 4 3 4 5% 29%	1884
March	1st to 10th	Night	21% 14% 3 7% 4 3 4 3 5% 6% 30%	3681
	11th to 20th	Night	13% 8% 2 5% 3 4 4 4 5% 6% 46%	3480
	21st to end	Night	14% 8% 2 8% 5% 4 5% 4 5% 7% 39%	3817
April	1st to 10th	Night	13% 7% 3 5% 4 4 3 4 5% 8% 44%	1986
	11th to 20th	Night	14% 8% 2 6% 4 3 4 3 5% 7% 44%	1875
	21st to end	Night	14% 7% 2 6% 6% 4 3 4 6% 7% 42%	1710
May	1st to 10th	Night	15% 8% 3 7% 5% 5% 5% 4 7% 8% 33%	2813
	11th to 20th	Night	17% 8% 3 6% 5% 5% 4 4 5% 7% 36%	2812
	21st to end	Night	8% 5% 2 6% 4 5% 5% 4 7% 10% 44%	3079
June	1st to 10th	Night	8% 5% 2 6% 6% 6% 5% 5% 6% 10% 41%	1710
	11th to 20th	Night	4 3 1 4 5% 4 6% 5% 8% 11% 48%	1710
	21st to end	Night	6% 5% 2 5% 5% 5% 6% 6% 7% 12% 40%	1710
July	1st to 10th	Night	9% 5% 2 4 6% 5% 5% 6% 9% 9% 39%	1710
	11th to 20th	Night	7% 4 2 5% 5% 5% 5% 5% 8% 9% 45%	1710
	21st to end	Night	9% 5% 1 7% 6% 6% 6% 5% 8% 10% 36%	1870
August	1st to 10th	Night	8% 5% 2 6% 4 5% 4 5% 8% 11% 43%	1611
	11th to 20th	Night	8% 5% 3 7% 5% 4 5% 4 7% 9% 42%	1666
	21st to end	Night	9% 5% 1 4 5% 5% 5% 4 6% 11% 45%	1980
September	1st to 10th	Night	11% 6% 2 5% 3 3 4 4 6% 9% 45%	1916
	11th to 20th	Night	12% 6% 2 6% 5% 3 4 3 6% 7% 46%	1980
	21st to end	Night	11% 5% 2 6% 3 3 3 4 5% 5% 53%	1980
October	1st to 10th	Night	11% 5% 1 4 3 3 3 2 4 6% 57%	1980
	11th to 20th	Night	17% 5% 2 5% 4 3 4 3 4 6% 48%	2096
	21st to end	Night	15% 8% 2 5% 3 4 4 3 3 6% 47%	2446
November	1st to 10th	Night	11% 8% 2 6% 4 3 3 3 4 6% 51%	2406
	11th to 20th	Night	13% 8% 3 5% 3 4 4 3 5% 7% 46%	2470
	21st to end	Night	15% 11% 3 6% 4 3 4 3 4 5% 43%	2470
December	1st to 10th	Night	18% 14% 4 7% 5% 4 4 3 5% 5% 30%	2470
	11th to 20th	Night	16% 11% 5% 11% 4 3 3 3 4 5% 35%	3042
	21st to end	Night	16% 14% 5% 9% 6% 6% 6% 4 5% 6% 23%	4532

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	57% 6% 7% 16% 12% 2	2837
	11th to 20th	Day	61% 4 6% 13% 15% 1	2840
	21st to end	Day	57% 5% 7% 18% 12% 1	3127
February	1st to 10th	Day	55% 5% 7% 16% 16% 2	1900
	11th to 20th	Day	57% 4 7% 18% 12% 3	1858
	21st to end	Day	54% 4 9% 14% 14% 5%	1570
March	1st to 10th	Day	56% 5% 6% 17% 11% 5%	3170
	11th to 20th	Day	40% 6% 8% 25% 17% 4	3480
	21st to end	Day	45% 7% 8% 25% 13% 1	3815
April	1st to 10th	Day	42% 7% 10% 22% 15% 3	2209
	11th to 20th	Day	43% 6% 8% 18% 22% 3	2254
	21st to end	Day	44% 8% 10% 25% 12% 1	2469
May	1st to 10th	Day	50% 8% 10% 21% 9% 1	4120
	11th to 20th	Day	50% 8% 11% 22% 9%	4085
	21st to end	Day	40% 10% 13% 20% 16% 2	4489
June	1st to 10th	Day	43% 9% 13% 21% 13% 1	2470
	11th to 20th	Day	35% 11% 16% 21% 16% 2	2470
	21st to end	Day	37% 12% 15% 19% 13% 4	2470
July	1st to 10th	Day	46% 11% 14% 18% 10% 2	2405
	11th to 20th	Day	44% 10% 15% 17% 11% 2	2401
	21st to end	Day	45% 11% 14% 19% 9% 1	2537
August	1st to 10th	Day	42% 12% 18% 19% 8%	2314
	11th to 20th	Day	44% 10% 15% 18% 13% 1	2231
	21st to end	Day	43% 11% 13% 18% 12% 3	2376
September	1st to 10th	Day	43% 8% 10% 18% 17% 3	2026
	11th to 20th	Day	44% 7% 11% 19% 16% 2	1980
	21st to end	Day	36% 8% 10% 22% 20% 4	1980
October	1st to 10th	Day	33% 5% 10% 23% 24% 5%	1980
	11th to 20th	Day	35% 5% 10% 20% 24% 6%	1864
	21st to end	Day	39% 4 8% 24% 20% 5%	1908
November	1st to 10th	Day	32% 5% 9% 23% 28% 4	1672
	11th to 20th	Day	39% 5% 6% 22% 22% 6%	1710
	21st to end	Day	44% 5% 8% 19% 21% 3	1710
December	1st to 10th	Day	55% 5% 7% 20% 12% 2	1710
	11th to 20th	Day	52% 6% 9% 16% 15% 2	2150
	21st to end	Day	52% 5% 11% 21% 10% 1	3124
January	1st to 10th	Night	57% 5% 7% 16% 13% 2	4109
	11th to 20th	Night	57% 3 6% 13% 17% 4	4120
	21st to end	Night	56% 4 8% 14% 16% 1	4528
February	1st to 10th	Night	52% 6% 9% 18% 14% 2	2280
	11th to 20th	Night	56% 4 6% 17% 12% 4	2219
	21st to end	Night	57% 4 8% 14% 14% 3	1884
March	1st to 10th	Night	55% 6% 9% 14% 14% 3	3681
	11th to 20th	Night	37% 5% 9% 27% 13% 8%	3480
	21st to end	Night	44% 5% 11% 24% 14% 1	3817
April	1st to 10th	Night	39% 6% 10% 24% 18% 3	1986
	11th to 20th	Night	39% 6% 9% 20% 21% 5%	1875
	21st to end	Night	41% 7% 10% 28% 13% 1	1710
May	1st to 10th	Night	45% 9% 14% 23% 7% 1	2840
	11th to 20th	Night	45% 8% 14% 23% 10%	2813
	21st to end	Night	32% 12% 14% 26% 15% 1	3087
June	1st to 10th	Night	37% 8% 14% 24% 14% 2	1710
	11th to 20th	Night	25% 11% 20% 26% 17% 1	1710
	21st to end	Night	33% 10% 17% 22% 14% 3	1710
July	1st to 10th	Night	35% 12% 18% 21% 11% 2	1665
	11th to 20th	Night	31% 10% 20% 20% 14% 4	1656
	21st to end	Night	37% 12% 17% 23% 10% 1	1771
August	1st to 10th	Night	32% 11% 18% 27% 11% 1	1600
	11th to 20th	Night	34% 10% 21% 19% 15% 1	1666
	21st to end	Night	33% 9% 15% 26% 15% 2	1980
September	1st to 10th	Night	34% 10% 14% 20% 17% 5%	1916
	11th to 20th	Night	36% 8% 12% 23% 19% 2	1980
	21st to end	Night	32% 7% 9% 22% 25% 4	1980
October	1st to 10th	Night	29% 5% 9% 23% 27% 6%	1980
	11th to 20th	Night	37% 6% 9% 22% 21% 6%	2096
	21st to end	Night	38% 4 7% 21% 24% 6%	2446
November	1st to 10th	Night	35% 5% 6% 22% 24% 7%	2406
	11th to 20th	Night	39% 4 8% 19% 23% 7%	2470
	21st to end	Night	44% 4 6% 24% 19% 3	2470
December	1st to 10th	Night	56% 5% 8% 18% 11% 2	2470
	11th to 20th	Night	52% 4 7% 16% 17% 3	3044
	21st to end	Night	57% 7% 11% 14% 11%	4532

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	31% 25% 31% 11% 1 1	270
	11th to 20th	Day	40% 29% 17% 10% 3	270
	21st to end	Day	31% 29% 31% 8% 1	297
February	1st to 10th	Day	34% 23% 28% 13% 2	270
	11th to 20th	Day	47% 24% 23% 5% 1	270
	21st to end	Day	44% 20% 31% 3 1	225
March	1st to 10th	Day	31% 27% 30% 11% 2	294
	11th to 20th	Day	29% 24% 26% 16% 4 1	460
	21st to end	Day	28% 22% 27% 16% 6% 1	506
April	1st to 10th	Day	30% 15% 27% 18% 10% 1	460
	11th to 20th	Day	22% 18% 32% 16% 10% 2	452
	21st to end	Day	23% 15% 32% 17% 11% 1	460
May	1st to 10th	Day	23% 17% 28% 18% 9% 4	463
	11th to 20th	Day	16% 12% 27% 25% 13% 7%	487
	21st to end	Day	14% 9% 22% 25% 19% 11%	529
June	1st to 10th	Day	14% 8% 22% 25% 21% 9%	490
	11th to 20th	Day	8% 5% 19% 32% 24% 13%	490
	21st to end	Day	8% 6% 25% 30% 20% 11%	490
July	1st to 10th	Day	13% 4 16% 24% 26% 17%	485
	11th to 20th	Day	9% 6% 17% 26% 24% 18%	484
	21st to end	Day	15% 5% 13% 29% 24% 13%	529
August	1st to 10th	Day	14% 3 16% 27% 25% 15%	446
	11th to 20th	Day	14% 5% 15% 31% 23% 12%	439
	21st to end	Day	14% 3 10% 29% 27% 16%	495
September	1st to 10th	Day	14% 3 16% 24% 31% 13%	450
	11th to 20th	Day	14% 5% 12% 26% 30% 12%	450
	21st to end	Day	18% 5% 18% 30% 22% 8%	450
October	1st to 10th	Day	14% 8% 21% 27% 22% 7%	450
	11th to 20th	Day	18% 14% 26% 26% 15% 2	450
	21st to end	Day	26% 11% 28% 24% 11% 1	423
November	1st to 10th	Day	21% 12% 36% 21% 9% 2	270
	11th to 20th	Day	23% 17% 39% 17% 3	270
	21st to end	Day	21% 19% 35% 17% 8%	270
December	1st to 10th	Day	33% 21% 29% 13% 4	270
	11th to 20th	Day	27% 21% 31% 14% 5% 1	270
	21st to end	Day	31% 24% 33% 10% 2	297
January	1st to 10th	Night	24% 23% 28% 20% 5%	760
	11th to 20th	Night	30% 22% 24% 20% 4	760
	21st to end	Night	24% 19% 34% 21% 3	836
February	1st to 10th	Night	25% 18% 32% 23% 2	760
	11th to 20th	Night	30% 20% 33% 16% 1	743
	21st to end	Night	33% 21% 28% 17% 2	628
March	1st to 10th	Night	25% 16% 29% 24% 5%	760
	11th to 20th	Night	25% 17% 28% 22% 6% 1	760
	21st to end	Night	25% 14% 26% 26% 8%	836
April	1st to 10th	Night	19% 17% 27% 26% 10%	656
	11th to 20th	Night	20% 13% 28% 27% 12% 1	563
	21st to end	Night	18% 9% 31% 31% 11% 2	570
May	1st to 10th	Night	16% 9% 26% 31% 16% 2	570
	11th to 20th	Night	15% 7% 19% 35% 20% 4	561
	21st to end	Night	8% 3 20% 31% 32% 6%	617
June	1st to 10th	Night	10% 4 15% 36% 31% 4	570
	11th to 20th	Night	4 1 15% 38% 34% 8%	570
	21st to end	Night	8% 3 11% 41% 29% 7%	570
July	1st to 10th	Night	11% 1 9% 29% 41% 8%	555
	11th to 20th	Night	8% 2 10% 27% 44% 9%	552
	21st to end	Night	9% 2 9% 31% 41% 8%	624
August	1st to 10th	Night	12% 2 8% 27% 44% 7%	537
	11th to 20th	Night	12% 1 9% 33% 39% 7%	534
	21st to end	Night	12% 1 7% 30% 40% 11%	594
September	1st to 10th	Night	13% 2 9% 26% 41% 9%	656
	11th to 20th	Night	14% 3 11% 29% 37% 7%	720
	21st to end	Night	14% 3 16% 32% 28% 6%	720
October	1st to 10th	Night	12% 7% 16% 27% 31% 7%	720
	11th to 20th	Night	20% 8% 21% 30% 18% 2	720
	21st to end	Night	18% 11% 23% 30% 15% 2	792
November	1st to 10th	Night	16% 10% 19% 34% 18% 3	740
	11th to 20th	Night	18% 16% 26% 30% 10% 2	760
	21st to end	Night	22% 14% 25% 29% 9%	760
December	1st to 10th	Night	28% 17% 24% 25% 6%	760
	11th to 20th	Night	24% 16% 26% 27% 6% 1	760
	21st to end	Night	29% 16% 25% 25% 4	836

Page generated at 2024-07-28 09:52:10. Version ac07

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