Utica
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Utica clear sky chart from 2005-11-06 to 2026-05-17.

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	11% 7% 3 7% 4 4 4 3 5% 7% 44%	131577
	Night	9% 7% 3 7% 4 4 4 3 5% 7% 46%	131499
Transparency	Day	38% 6% 14% 25% 15% 2	135161
	Night	36% 5% 14% 26% 16% 2	135985
Seeing	Day	14% 10% 31% 30% 13% 2	17952
	Night	13% 9% 34% 34% 10%	27942

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	9% 13% 6% 13% 7% 7% 5% 3 4 5% 28%	4722
	11th to 20th	Day	4 11% 4 11% 7% 7% 6% 4 7% 7% 32%	4836
	21st to end	Day	4 9% 5% 11% 6% 5% 6% 4 6% 5% 38%	5812
February	1st to 10th	Day	8% 12% 4 10% 8% 6% 7% 3 6% 6% 30%	1890
	11th to 20th	Day	8% 11% 5% 9% 4 5% 5% 3 5% 7% 38%	1923
	21st to end	Day	9% 9% 3 8% 6% 5% 5% 3 5% 7% 38%	1730
March	1st to 10th	Day	11% 7% 4 8% 4 3 3 3 4 5% 48%	4797
	11th to 20th	Day	8% 7% 3 6% 3 3 3 3 5% 7% 52%	5090
	21st to end	Day	21% 10% 4 11% 5% 5% 4 4 5% 6% 25%	5583
April	1st to 10th	Day	16% 7% 3 7% 4 3 5% 3 5% 6% 39%	2378
	11th to 20th	Day	18% 7% 3 6% 4 4 4 4 5% 6% 39%	2702
	21st to end	Day	20% 8% 2 6% 4 4 4 3 5% 6% 39%	2730
May	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 6% 7% 49%	5992
	11th to 20th	Day	14% 6% 2 6% 4 3 3 3 4 6% 50%	5941
	21st to end	Day	19% 7% 3 6% 4 4 4 3 5% 7% 36%	6651
June	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 5% 8% 49%	2935
	11th to 20th	Day	13% 6% 2 5% 3 4 4 3 6% 9% 46%	3000
	21st to end	Day	7% 5% 2 5% 4 4 4 3 7% 8% 50%	3000
July	1st to 10th	Day	8% 5% 2 5% 4 4 5% 4 7% 9% 48%	6481
	11th to 20th	Day	9% 5% 2 6% 3 3 3 3 5% 7% 52%	6323
	21st to end	Day	6% 5% 2 6% 4 4 4 4 7% 9% 50%	6422
August	1st to 10th	Day	7% 5% 2 6% 4 4 5% 4 6% 9% 48%	4234
	11th to 20th	Day	16% 8% 3 6% 4 4 4 3 6% 7% 39%	4171
	21st to end	Day	7% 5% 2 5% 3 3 4 4 5% 7% 55%	4675
September	1st to 10th	Day	14% 4 1 5% 3 3 4 3 4 6% 53%	2294
	11th to 20th	Day	8% 5% 2 5% 3 3 3 4 5% 7% 56%	2200
	21st to end	Day	11% 4 1 4 2 3 3 2 5% 7% 57%	2200
October	1st to 10th	Day	14% 5% 2 4 3 3 4 3 4 5% 54%	2098
	11th to 20th	Day	12% 6% 2 5% 2 3 3 2 4 5% 54%	2000
	21st to end	Day	14% 7% 3 6% 3 2 3 3 5% 6% 47%	2083
November	1st to 10th	Day	8% 6% 3 6% 4 4 5% 4 6% 7% 47%	1853
	11th to 20th	Day	8% 7% 2 8% 5% 5% 4 3 5% 7% 46%	1836
	21st to end	Day	10% 9% 2 8% 4 4 3 4 5% 8% 43%	1680
December	1st to 10th	Day	5% 7% 3 8% 7% 6% 5% 4 6% 7% 41%	2690
	11th to 20th	Day	8% 11% 4 8% 5% 5% 5% 4 6% 7% 37%	2956
	21st to end	Day	13% 8% 4 15% 5% 4 4 3 5% 7% 31%	3669
January	1st to 10th	Night	7% 11% 4 12% 8% 7% 6% 4 6% 6% 28%	8201
	11th to 20th	Night	3 9% 3 9% 7% 6% 7% 4 7% 7% 37%	8138
	21st to end	Night	3 8% 5% 10% 5% 4 5% 4 6% 6% 44%	8402
February	1st to 10th	Night	10% 10% 3 9% 6% 5% 4 4 5% 6% 38%	2730
	11th to 20th	Night	7% 12% 4 8% 5% 4 4 4 5% 6% 42%	2602
	21st to end	Night	9% 8% 2 6% 5% 5% 4 4 6% 5% 47%	2076
March	1st to 10th	Night	12% 6% 2 4 3 3 4 3 5% 7% 52%	5288
	11th to 20th	Night	10% 6% 2 4 3 3 4 2 5% 8% 52%	5090
	21st to end	Night	16% 9% 3 8% 5% 5% 4 3 5% 7% 35%	5588
April	1st to 10th	Night	13% 8% 3 6% 4 5% 4 4 5% 7% 42%	2237
	11th to 20th	Night	13% 8% 3 5% 4 4 4 3 5% 6% 46%	1869
	21st to end	Night	16% 7% 2 5% 4 4 5% 3 5% 6% 42%	1890
May	1st to 10th	Night	12% 4 2 4 3 3 4 3 4 7% 53%	4143
	11th to 20th	Night	12% 6% 2 4 3 3 4 3 4 7% 52%	4107
	21st to end	Night	17% 7% 2 5% 3 4 4 3 5% 8% 42%	4224
June	1st to 10th	Night	8% 4 2 5% 4 3 3 3 6% 9% 54%	1460
	11th to 20th	Night	7% 5% 2 5% 4 3 4 3 6% 9% 52%	1400
	21st to end	Night	7% 3 2 4 3 3 4 4 6% 8% 56%	1400
July	1st to 10th	Night	7% 5% 2 5% 4 4 3 3 6% 8% 52%	3491
	11th to 20th	Night	8% 4 2 5% 3 3 3 3 5% 7% 57%	3637
	21st to end	Night	6% 3 1 4 3 4 4 4 7% 10% 55%	4449
August	1st to 10th	Night	6% 5% 2 6% 3 4 4 4 7% 10% 49%	2926
	11th to 20th	Night	10% 5% 2 6% 3 4 4 4 6% 7% 49%	2888
	21st to end	Night	6% 3 2 5% 4 3 4 3 5% 9% 54%	3234
September	1st to 10th	Night	8% 3 1 4 4 3 4 3 4 6% 59%	2100
	11th to 20th	Night	7% 4 2 4 3 3 4 3 5% 7% 58%	2200
	21st to end	Night	8% 3 1 4 3 3 3 3 4 6% 62%	2200
October	1st to 10th	Night	15% 5% 2 4 2 2 3 3 4 5% 55%	2281
	11th to 20th	Night	12% 6% 2 4 3 3 3 3 4 6% 55%	2400
	21st to end	Night	13% 6% 2 5% 3 3 3 3 4 6% 52%	2755
November	1st to 10th	Night	8% 5% 2 5% 4 4 4 3 5% 7% 54%	2665
	11th to 20th	Night	7% 7% 2 6% 5% 4 3 4 6% 7% 49%	2782
	21st to end	Night	8% 7% 2 6% 3 4 4 4 7% 7% 47%	2940
December	1st to 10th	Night	5% 7% 4 8% 6% 5% 4 4 4 6% 47%	4720
	11th to 20th	Night	8% 9% 3 9% 6% 6% 5% 4 6% 7% 38%	5452
	21st to end	Night	14% 11% 4 12% 5% 5% 4 3 4 6% 32%	7534

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	58% 5% 15% 15% 7%	4723
	11th to 20th	Day	49% 3 13% 19% 14% 1	4836
	21st to end	Day	45% 5% 18% 21% 10% 1	5812
February	1st to 10th	Day	52% 8% 15% 16% 9% 1	1890
	11th to 20th	Day	46% 6% 11% 22% 13% 2	1932
	21st to end	Day	45% 6% 15% 21% 12% 2	1730
March	1st to 10th	Day	38% 5% 10% 30% 14% 2	4797
	11th to 20th	Day	31% 5% 11% 29% 21% 2	5090
	21st to end	Day	59% 6% 14% 16% 4 2	5585
April	1st to 10th	Day	45% 5% 12% 24% 12% 1	2378
	11th to 20th	Day	44% 6% 11% 22% 14% 3	2702
	21st to end	Day	45% 7% 12% 23% 14%	2730
May	1st to 10th	Day	32% 7% 11% 26% 24% 1	6030
	11th to 20th	Day	35% 6% 11% 23% 16% 9%	5945
	21st to end	Day	46% 7% 11% 24% 12% 1	6665
June	1st to 10th	Day	32% 7% 17% 29% 12% 2	2935
	11th to 20th	Day	35% 7% 16% 23% 16% 3	3000
	21st to end	Day	28% 8% 17% 29% 15% 3	3000
July	1st to 10th	Day	31% 6% 19% 29% 14% 1	6412
	11th to 20th	Day	31% 6% 12% 32% 17% 3	6248
	21st to end	Day	29% 7% 19% 26% 17% 3	6240
August	1st to 10th	Day	32% 7% 15% 30% 13% 2	4220
	11th to 20th	Day	43% 7% 13% 25% 10% 1	4210
	21st to end	Day	28% 7% 17% 26% 19% 3	4674
September	1st to 10th	Day	32% 6% 12% 28% 18% 3	2294
	11th to 20th	Day	27% 6% 16% 33% 17% 1	2200
	21st to end	Day	27% 6% 11% 31% 23% 3	2200
October	1st to 10th	Day	23% 3 8% 25% 38% 4	3410
	11th to 20th	Day	27% 4 14% 29% 20% 5%	3240
	21st to end	Day	36% 4 13% 26% 19% 3	3352
November	1st to 10th	Day	35% 6% 17% 26% 14% 2	1853
	11th to 20th	Day	38% 6% 16% 24% 14% 2	1836
	21st to end	Day	41% 5% 15% 26% 12% 1	1680
December	1st to 10th	Day	41% 6% 17% 26% 9% 1	2690
	11th to 20th	Day	46% 6% 19% 20% 9%	2953
	21st to end	Day	52% 5% 13% 24% 5% 1	3669
January	1st to 10th	Night	54% 5% 15% 17% 8% 1	8202
	11th to 20th	Night	43% 5% 15% 21% 15% 1	8138
	21st to end	Night	39% 5% 15% 26% 15%	8402
February	1st to 10th	Night	46% 6% 15% 21% 11% 1	2730
	11th to 20th	Night	42% 5% 15% 22% 13% 4	2603
	21st to end	Night	39% 5% 14% 26% 13% 4	2076
March	1st to 10th	Night	32% 4 11% 30% 21% 2	5288
	11th to 20th	Night	31% 4 9% 28% 25% 3	5090
	21st to end	Night	48% 7% 14% 23% 7% 1	5588
April	1st to 10th	Night	41% 6% 14% 25% 14% 1	2237
	11th to 20th	Night	38% 5% 10% 24% 20% 2	1869
	21st to end	Night	41% 8% 12% 23% 14% 2	1890
May	1st to 10th	Night	30% 6% 12% 25% 25% 2	4170
	11th to 20th	Night	32% 6% 12% 21% 21% 9%	4108
	21st to end	Night	41% 5% 11% 28% 13% 1	4232
June	1st to 10th	Night	26% 8% 16% 29% 18% 3	1460
	11th to 20th	Night	28% 7% 16% 24% 21% 4	1400
	21st to end	Night	24% 7% 16% 31% 19% 3	1400
July	1st to 10th	Night	29% 5% 19% 31% 13% 3	3453
	11th to 20th	Night	28% 5% 12% 35% 16% 3	3592
	21st to end	Night	23% 8% 21% 29% 17% 3	4320
August	1st to 10th	Night	30% 7% 16% 30% 15% 2	2916
	11th to 20th	Night	33% 7% 15% 28% 15% 2	2915
	21st to end	Night	27% 6% 17% 24% 22% 5%	3234
September	1st to 10th	Night	26% 6% 13% 28% 22% 5%	2100
	11th to 20th	Night	25% 5% 15% 32% 21% 2	2200
	21st to end	Night	24% 5% 10% 31% 26% 4	2200
October	1st to 10th	Night	20% 3 6% 20% 47% 5%	3736
	11th to 20th	Night	24% 3 11% 31% 25% 5%	3899
	21st to end	Night	35% 4 13% 27% 19% 1	4442
November	1st to 10th	Night	30% 5% 15% 25% 21% 4	2665
	11th to 20th	Night	34% 6% 15% 25% 18% 3	2782
	21st to end	Night	34% 6% 16% 28% 16% 1	2940
December	1st to 10th	Night	38% 4 15% 32% 11% 1	4720
	11th to 20th	Night	44% 7% 15% 26% 7%	5454
	21st to end	Night	54% 4 13% 22% 7%	7534

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	18% 12% 32% 27% 9% 3	330
	11th to 20th	Day	15% 14% 35% 28% 7% 1	330
	21st to end	Day	12% 10% 44% 25% 8% 1	363
February	1st to 10th	Day	10% 19% 42% 25% 4	330
	11th to 20th	Day	14% 13% 38% 26% 7% 1	330
	21st to end	Day	15% 14% 41% 25% 4	273
March	1st to 10th	Day	16% 11% 42% 27% 3 1	330
	11th to 20th	Day	18% 14% 36% 23% 9% 1	330
	21st to end	Day	28% 13% 35% 18% 5% 1	363
April	1st to 10th	Day	23% 18% 37% 18% 4	398
	11th to 20th	Day	23% 17% 30% 24% 6%	740
	21st to end	Day	25% 12% 32% 21% 8% 2	750
May	1st to 10th	Day	16% 12% 33% 26% 11% 2	753
	11th to 20th	Day	19% 11% 28% 25% 16% 2	756
	21st to end	Day	17% 10% 30% 28% 11% 4	789
June	1st to 10th	Day	8% 9% 24% 33% 21% 4	730
	11th to 20th	Day	12% 8% 35% 30% 14% 2	730
	21st to end	Day	11% 7% 29% 36% 16% 2	730
July	1st to 10th	Day	6% 4 22% 36% 26% 6%	721
	11th to 20th	Day	8% 4 26% 42% 18% 3	718
	21st to end	Day	5% 3 25% 45% 18% 3	794
August	1st to 10th	Day	9% 4 23% 42% 20% 3	726
	11th to 20th	Day	11% 3 24% 36% 21% 5%	715
	21st to end	Day	7% 4 26% 37% 22% 3	803
September	1st to 10th	Day	14% 5% 28% 32% 17% 3	424
	11th to 20th	Day	9% 5% 35% 32% 16% 3	330
	21st to end	Day	13% 12% 26% 29% 15% 5%	330
October	1st to 10th	Day	17% 8% 29% 29% 14% 3	330
	11th to 20th	Day	17% 17% 35% 22% 8% 1	330
	21st to end	Day	20% 15% 36% 22% 7% 1	363
November	1st to 10th	Day	18% 11% 35% 25% 8% 3	330
	11th to 20th	Day	13% 16% 41% 23% 7%	330
	21st to end	Day	19% 18% 30% 22% 10% 1	330
December	1st to 10th	Day	13% 11% 36% 29% 9% 1	330
	11th to 20th	Day	16% 13% 41% 23% 8%	330
	21st to end	Day	20% 11% 36% 27% 6%	363
January	1st to 10th	Night	12% 10% 37% 32% 8%	1050
	11th to 20th	Night	11% 16% 36% 30% 7% 1	1050
	21st to end	Night	12% 9% 41% 30% 7%	1155
February	1st to 10th	Night	14% 11% 40% 29% 5%	1050
	11th to 20th	Night	12% 12% 39% 32% 5%	968
	21st to end	Night	14% 10% 37% 32% 8% 1	692
March	1st to 10th	Night	13% 11% 42% 29% 6% 1	751
	11th to 20th	Night	16% 9% 40% 29% 6%	630
	21st to end	Night	18% 10% 41% 25% 6%	693
April	1st to 10th	Night	17% 15% 39% 27% 2	630
	11th to 20th	Night	16% 14% 38% 26% 6%	623
	21st to end	Night	18% 10% 37% 27% 6% 1	630
May	1st to 10th	Night	15% 8% 35% 33% 10%	630
	11th to 20th	Night	16% 9% 29% 36% 11%	609
	21st to end	Night	19% 5% 33% 34% 9%	650
June	1st to 10th	Night	8% 6% 27% 41% 18% 1	600
	11th to 20th	Night	10% 3 33% 42% 12% 1	600
	21st to end	Night	8% 4 27% 46% 15%	600
July	1st to 10th	Night	6% 3 21% 44% 26% 1	585
	11th to 20th	Night	5% 2 21% 55% 16%	582
	21st to end	Night	4 2 23% 54% 17%	657
August	1st to 10th	Night	7% 4 24% 46% 18% 1	597
	11th to 20th	Night	8% 3 24% 43% 21% 1	594
	21st to end	Night	7% 3 28% 44% 17% 1	660
September	1st to 10th	Night	9% 6% 26% 42% 16% 2	600
	11th to 20th	Night	8% 4 34% 39% 14% 2	600
	21st to end	Night	9% 6% 35% 34% 15% 1	600
October	1st to 10th	Night	19% 7% 29% 34% 10% 1	681
	11th to 20th	Night	15% 12% 37% 28% 7% 1	800
	21st to end	Night	16% 13% 32% 30% 8%	995
November	1st to 10th	Night	11% 9% 38% 32% 9% 1	1025
	11th to 20th	Night	11% 12% 39% 31% 7%	1050
	21st to end	Night	12% 10% 35% 34% 9%	1050
December	1st to 10th	Night	13% 10% 39% 32% 6%	1050
	11th to 20th	Night	14% 8% 37% 32% 8%	1050
	21st to end	Night	20% 10% 36% 28% 6% 1	1155

Page generated at 2026-05-14 00:58:57. Version ac07

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