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 2025-01-07.

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%	105046
	Night	14% 9% 3 7% 4 4 4 3 5% 7% 39%	103964
Transparency	Day	44% 7% 11% 21% 15% 3	108803
	Night	42% 6% 11% 22% 16% 3	108332
Seeing	Day	21% 13% 24% 21% 15% 7%	14948
	Night	19% 11% 21% 28% 18% 3	25033

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%	2890
	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	8% 5% 2 7% 6% 7% 7% 5% 9% 11% 34%	4120
	11th to 20th	Day	10% 5% 2 7% 7% 6% 6% 5% 7% 9% 36%	4120
	21st to end	Day	20% 11% 3 9% 7% 6% 5% 4 6% 7% 19%	4466
August	1st to 10th	Day	9% 5% 3 6% 5% 5% 5% 5% 7% 11% 40%	4104
	11th to 20th	Day	9% 5% 2 6% 5% 5% 7% 5% 8% 11% 36%	3916
	21st to end	Day	7% 4 1 4 4 5% 5% 4 7% 8% 51%	4180
September	1st to 10th	Day	15% 6% 2 6% 5% 4 6% 4 5% 6% 40%	2138
	11th to 20th	Day	14% 6% 3 7% 5% 5% 5% 4 6% 8% 39%	2090
	21st to end	Day	17% 5% 1 6% 3 4 4 4 5% 6% 45%	2090
October	1st to 10th	Day	10% 6% 2 5% 3 4 4 3 5% 6% 52%	2090
	11th to 20th	Day	13% 6% 2 6% 3 4 3 3 4 6% 50%	1967
	21st to end	Day	17% 6% 2 4 4 3 3 3 5% 7% 46%	2013
November	1st to 10th	Day	12% 7% 2 5% 3 3 4 3 5% 6% 52%	1762
	11th to 20th	Day	13% 9% 2 6% 4 3 4 4 4 6% 45%	1800
	21st to end	Day	14% 11% 3 6% 5% 3 4 3 4 6% 41%	1800
December	1st to 10th	Day	14% 12% 2 8% 5% 4 4 3 4 5% 40%	2930
	11th to 20th	Day	21% 16% 5% 7% 4 4 4 3 5% 5% 26%	3373
	21st to end	Day	17% 15% 5% 8% 5% 4 4 4 6% 7% 26%	4466
January	1st to 10th	Night	17% 17% 6% 9% 5% 3 3 3 4 5% 28%	4188
	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	8% 5% 2 5% 5% 5% 6% 5% 9% 10% 40%	2840
	11th to 20th	Night	10% 5% 1 4 4 4 4 4 6% 9% 47%	2840
	21st to end	Night	14% 9% 3 9% 6% 7% 7% 5% 7% 8% 24%	3087
August	1st to 10th	Night	7% 5% 2 6% 4 4 4 4 7% 9% 47%	2825
	11th to 20th	Night	9% 6% 2 6% 4 3 4 4 6% 9% 45%	2909
	21st to end	Night	5% 3 1 3 3 3 4 3 5% 9% 61%	3476
September	1st to 10th	Night	10% 6% 2 5% 4 3 4 4 6% 8% 46%	2023
	11th to 20th	Night	11% 6% 2 7% 5% 3 4 3 6% 7% 46%	2090
	21st to end	Night	12% 5% 2 6% 3 3 3 3 5% 5% 51%	2090
October	1st to 10th	Night	11% 5% 1 4 3 3 3 2 4 6% 57%	2090
	11th to 20th	Night	16% 5% 2 5% 4 3 4 3 4 6% 50%	2213
	21st to end	Night	14% 8% 2 5% 3 3 4 3 3 6% 49%	2582
November	1st to 10th	Night	11% 8% 2 6% 4 3 3 3 4 6% 50%	2536
	11th to 20th	Night	13% 9% 3 5% 3 3 4 3 5% 7% 45%	2600
	21st to end	Night	14% 12% 3 6% 3 2 3 3 4 5% 43%	2600
December	1st to 10th	Night	16% 14% 5% 10% 5% 4 3 3 3 4 35%	4250
	11th to 20th	Night	21% 14% 6% 9% 3 3 3 2 4 4 31%	4822
	21st to end	Night	16% 14% 5% 8% 5% 5% 5% 4 5% 7% 25%	6490

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	2891
	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	39% 11% 19% 20% 9% 1	4055
	11th to 20th	Day	42% 8% 16% 26% 7% 1	4051
	21st to end	Day	62% 9% 10% 14% 5% 1	4324
August	1st to 10th	Day	35% 9% 16% 29% 11%	4091
	11th to 20th	Day	37% 10% 16% 24% 13% 1	3955
	21st to end	Day	29% 8% 13% 37% 11% 1	4179
September	1st to 10th	Day	43% 8% 10% 18% 18% 4	2138
	11th to 20th	Day	43% 7% 11% 20% 17% 2	2090
	21st to end	Day	38% 8% 10% 21% 19% 4	2090
October	1st to 10th	Day	24% 4 7% 22% 35% 8%	3480
	11th to 20th	Day	24% 3 10% 23% 30% 9%	3246
	21st to end	Day	31% 3 9% 27% 20% 10%	3289
November	1st to 10th	Day	33% 5% 9% 22% 27% 4	1762
	11th to 20th	Day	40% 5% 6% 21% 22% 6%	1800
	21st to end	Day	46% 5% 8% 19% 21% 3	1800
December	1st to 10th	Day	46% 5% 5% 20% 22% 1	2930
	11th to 20th	Day	60% 5% 7% 16% 11% 2	3370
	21st to end	Day	54% 6% 12% 19% 8% 1	4466
January	1st to 10th	Night	57% 5% 7% 16% 13% 2	4188
	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	34% 11% 22% 24% 9% 1	2795
	11th to 20th	Night	31% 7% 19% 31% 9% 2	2786
	21st to end	Night	54% 10% 13% 16% 6% 1	2988
August	1st to 10th	Night	31% 8% 15% 32% 13%	2814
	11th to 20th	Night	33% 8% 18% 29% 13% 1	2936
	21st to end	Night	21% 6% 13% 42% 16% 2	3476
September	1st to 10th	Night	34% 9% 13% 20% 18% 6%	2023
	11th to 20th	Night	37% 8% 11% 23% 19% 2	2090
	21st to end	Night	34% 7% 10% 21% 24% 4	2090
October	1st to 10th	Night	26% 4 6% 24% 32% 8%	3480
	11th to 20th	Night	25% 4 7% 25% 25% 15%	3673
	21st to end	Night	25% 3 9% 24% 25% 13%	4243
November	1st to 10th	Night	36% 5% 7% 21% 24% 7%	2536
	11th to 20th	Night	40% 4 8% 19% 23% 6%	2600
	21st to end	Night	45% 4 6% 24% 18% 3	2600
December	1st to 10th	Night	54% 4 5% 16% 19% 1	4250
	11th to 20th	Night	57% 4 6% 18% 13% 2	4824
	21st to end	Night	56% 7% 12% 16% 9%	6490

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% 25% 31% 11% 1 1	288
	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	16% 5% 14% 29% 24% 13%	532
August	1st to 10th	Day	13% 3 16% 28% 24% 15%	486
	11th to 20th	Day	13% 6% 17% 30% 22% 11%	479
	21st to end	Day	13% 3 9% 29% 28% 19%	539
September	1st to 10th	Day	13% 3 17% 25% 30% 12%	490
	11th to 20th	Day	14% 5% 13% 28% 29% 11%	490
	21st to end	Day	20% 5% 18% 29% 20% 8%	490
October	1st to 10th	Day	13% 8% 22% 27% 23% 7%	490
	11th to 20th	Day	17% 13% 26% 25% 17% 3	490
	21st to end	Day	24% 10% 28% 26% 10% 2	462
November	1st to 10th	Day	20% 13% 36% 21% 9% 2	300
	11th to 20th	Day	23% 18% 39% 17% 3	300
	21st to end	Day	22% 20% 35% 17% 7%	300
December	1st to 10th	Day	32% 22% 31% 12% 3	300
	11th to 20th	Day	29% 20% 32% 13% 5% 1	300
	21st to end	Day	31% 22% 32% 12% 3	330
January	1st to 10th	Night	25% 23% 28% 20% 4	785
	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% 1 9% 32% 41% 8%	624
August	1st to 10th	Night	12% 2 8% 28% 44% 7%	567
	11th to 20th	Night	11% 2 9% 35% 38% 6%	564
	21st to end	Night	11% 1 7% 30% 41% 11%	627
September	1st to 10th	Night	12% 2 9% 29% 39% 9%	693
	11th to 20th	Night	14% 3 12% 29% 36% 7%	760
	21st to end	Night	16% 3 16% 32% 28% 6%	760
October	1st to 10th	Night	12% 7% 15% 28% 31% 7%	760
	11th to 20th	Night	19% 8% 21% 31% 19% 2	760
	21st to end	Night	17% 11% 23% 31% 16% 2	836
November	1st to 10th	Night	16% 10% 19% 34% 17% 3	780
	11th to 20th	Night	19% 15% 25% 30% 9% 2	800
	21st to end	Night	22% 14% 25% 29% 9%	800
December	1st to 10th	Night	27% 18% 25% 25% 6%	800
	11th to 20th	Night	26% 16% 26% 26% 6% 1	800
	21st to end	Night	29% 16% 25% 25% 5%	880

Page generated at 2025-01-04 03:24:04. Version ac07

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