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 2025-01-22.

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%	104854
	Night	9% 7% 3 7% 4 4 4 3 5% 7% 45%	104581
Transparency	Day	38% 6% 14% 25% 14% 2	108477
	Night	36% 6% 14% 25% 16% 2	109091
Seeing	Day	14% 9% 30% 30% 14% 2	16142
	Night	13% 9% 34% 34% 10% 1	26166

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% 12% 5% 11% 7% 7% 7% 4 5% 5% 27%	2618
	11th to 20th	Day	5% 14% 5% 11% 5% 5% 7% 4 6% 7% 30%	2666
	21st to end	Day	5% 11% 6% 15% 6% 5% 6% 4 5% 5% 32%	3144
February	1st to 10th	Day	9% 12% 4 9% 8% 6% 7% 3 6% 6% 31%	1710
	11th to 20th	Day	9% 11% 4 8% 5% 5% 5% 3 5% 7% 38%	1735
	21st to end	Day	10% 10% 3 9% 6% 6% 5% 3 5% 7% 35%	1570
March	1st to 10th	Day	9% 8% 4 9% 4 3 3 3 4 6% 46%	3271
	11th to 20th	Day	9% 7% 3 7% 4 4 3 3 4 7% 48%	3480
	21st to end	Day	24% 11% 4 12% 5% 4 4 3 4 5% 23%	3814
April	1st to 10th	Day	16% 7% 3 7% 5% 3 5% 4 6% 6% 40%	2151
	11th to 20th	Day	19% 8% 3 6% 4 4 4 3 5% 6% 39%	2442
	21st to end	Day	19% 8% 2 6% 4 4 3 3 5% 6% 39%	2470
May	1st to 10th	Day	15% 7% 3 6% 5% 5% 5% 4 6% 7% 37%	4082
	11th to 20th	Day	10% 6% 2 7% 4 4 3 3 5% 6% 49%	4082
	21st to end	Day	17% 6% 2 6% 5% 4 4 3 5% 7% 41%	4624
June	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 6% 8% 49%	2788
	11th to 20th	Day	13% 6% 2 5% 3 4 4 3 6% 8% 46%	2850
	21st to end	Day	7% 5% 2 5% 4 4 4 3 7% 8% 51%	2850
July	1st to 10th	Day	10% 5% 2 6% 4 4 4 4 6% 9% 45%	4529
	11th to 20th	Day	7% 4 2 5% 3 3 3 3 5% 7% 58%	4413
	21st to end	Day	4 3 2 5% 3 4 4 4 6% 9% 57%	4465
August	1st to 10th	Day	7% 5% 2 6% 4 4 5% 4 6% 9% 49%	4104
	11th to 20th	Day	16% 8% 3 6% 4 4 4 3 6% 7% 39%	4041
	21st to end	Day	7% 5% 2 5% 3 3 4 4 5% 7% 55%	4532
September	1st to 10th	Day	14% 5% 1 5% 3 3 4 3 4 5% 53%	2180
	11th to 20th	Day	8% 5% 2 4 3 3 3 3 5% 7% 57%	2090
	21st to end	Day	11% 4 1 4 2 3 3 2 5% 7% 56%	2090
October	1st to 10th	Day	14% 5% 2 5% 3 4 4 3 4 5% 52%	1993
	11th to 20th	Day	11% 6% 2 5% 2 3 3 2 4 6% 55%	1900
	21st to end	Day	14% 7% 3 5% 4 2 3 3 5% 6% 48%	1979
November	1st to 10th	Day	8% 6% 3 6% 5% 4 5% 4 6% 7% 46%	1763
	11th to 20th	Day	8% 7% 2 8% 6% 5% 4 3 5% 7% 45%	1749
	21st to end	Day	10% 9% 2 8% 4 4 3 4 5% 8% 44%	1600
December	1st to 10th	Day	5% 7% 3 8% 7% 6% 5% 4 6% 7% 42%	2610
	11th to 20th	Day	8% 11% 4 8% 5% 5% 5% 4 6% 7% 37%	2879
	21st to end	Day	13% 8% 4 15% 5% 4 4 3 5% 7% 30%	3590
January	1st to 10th	Night	9% 12% 3 12% 10% 7% 7% 5% 5% 6% 25%	4557
	11th to 20th	Night	4 11% 4 9% 6% 6% 7% 5% 9% 7% 32%	4508
	21st to end	Night	5% 10% 7% 12% 5% 5% 6% 4 6% 7% 34%	4546
February	1st to 10th	Night	10% 9% 3 9% 6% 5% 4 4 4 6% 39%	2470
	11th to 20th	Night	7% 12% 3 7% 5% 4 4 4 5% 6% 43%	2348
	21st to end	Night	9% 8% 2 6% 5% 5% 4 3 6% 5% 45%	1884
March	1st to 10th	Night	10% 6% 2 5% 4 3 4 3 5% 6% 51%	3588
	11th to 20th	Night	9% 7% 2 5% 3 4 4 2 4 8% 51%	3480
	21st to end	Night	19% 10% 3 9% 6% 6% 4 3 5% 7% 29%	3817
April	1st to 10th	Night	13% 8% 2 6% 4 5% 4 4 5% 7% 41%	2025
	11th to 20th	Night	14% 9% 3 5% 4 4 4 3 5% 6% 44%	1689
	21st to end	Night	16% 7% 2 6% 4 4 5% 3 5% 7% 42%	1710
May	1st to 10th	Night	16% 5% 2 5% 4 4 4 3 4 7% 46%	2823
	11th to 20th	Night	10% 5% 2 5% 3 3 5% 4 5% 9% 51%	2823
	21st to end	Night	15% 6% 2 5% 4 4 4 3 5% 9% 44%	2941
June	1st to 10th	Night	7% 4 2 5% 4 3 3 3 6% 9% 55%	1387
	11th to 20th	Night	7% 5% 2 5% 3 3 4 3 6% 9% 52%	1330
	21st to end	Night	6% 3 2 3 3 3 4 3 6% 8% 58%	1330
July	1st to 10th	Night	7% 5% 2 6% 4 4 3 3 6% 7% 52%	2435
	11th to 20th	Night	5% 3 1 4 3 2 3 3 5% 7% 64%	2540
	21st to end	Night	2 2 1 4 3 3 4 4 7% 10% 60%	3098
August	1st to 10th	Night	6% 6% 2 6% 3 4 4 4 7% 10% 50%	2836
	11th to 20th	Night	10% 5% 2 6% 3 4 4 4 6% 7% 48%	2798
	21st to end	Night	7% 3 2 5% 4 3 4 3 5% 10% 54%	3135
September	1st to 10th	Night	9% 3 1 4 4 3 4 3 4 6% 59%	1995
	11th to 20th	Night	7% 4 2 4 3 3 3 3 5% 6% 60%	2090
	21st to end	Night	8% 3 1 4 3 3 3 3 4 6% 62%	2090
October	1st to 10th	Night	16% 5% 2 4 2 2 3 3 4 5% 54%	2167
	11th to 20th	Night	11% 5% 1 4 3 3 3 3 4 6% 55%	2280
	21st to end	Night	13% 6% 2 5% 3 3 3 3 4 6% 52%	2617
November	1st to 10th	Night	8% 5% 2 5% 4 4 4 3 5% 7% 54%	2535
	11th to 20th	Night	7% 7% 2 6% 5% 4 3 4 6% 6% 49%	2649
	21st to end	Night	8% 7% 2 6% 3 4 4 4 7% 7% 48%	2800
December	1st to 10th	Night	5% 7% 3 8% 6% 5% 4 4 4 6% 48%	4580
	11th to 20th	Night	8% 8% 3 9% 6% 6% 5% 4 6% 7% 38%	5309
	21st to end	Night	14% 12% 4 12% 5% 5% 4 3 4 6% 31%	7371

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	55% 8% 14% 15% 7%	2619
	11th to 20th	Day	51% 5% 14% 22% 8%	2666
	21st to end	Day	50% 7% 19% 15% 8%	3144
February	1st to 10th	Day	51% 8% 14% 17% 9% 1	1710
	11th to 20th	Day	46% 6% 13% 22% 12% 2	1744
	21st to end	Day	47% 6% 14% 20% 11% 2	1570
March	1st to 10th	Day	38% 8% 11% 28% 14% 1	3271
	11th to 20th	Day	36% 7% 11% 29% 14% 3	3480
	21st to end	Day	62% 7% 15% 13% 3 1	3814
April	1st to 10th	Day	44% 5% 13% 25% 12% 1	2151
	11th to 20th	Day	44% 7% 12% 21% 14% 2	2442
	21st to end	Day	45% 7% 12% 23% 12%	2470
May	1st to 10th	Day	41% 9% 13% 23% 15%	4120
	11th to 20th	Day	33% 8% 12% 27% 17% 3	4086
	21st to end	Day	41% 7% 13% 25% 13% 1	4637
June	1st to 10th	Day	32% 7% 17% 29% 12% 2	2788
	11th to 20th	Day	35% 7% 15% 23% 16% 3	2850
	21st to end	Day	28% 8% 17% 30% 15% 3	2850
July	1st to 10th	Day	34% 7% 19% 26% 13% 1	4460
	11th to 20th	Day	26% 6% 12% 33% 19% 4	4338
	21st to end	Day	22% 7% 18% 28% 21% 4	4325
August	1st to 10th	Day	32% 7% 15% 30% 14% 3	4090
	11th to 20th	Day	44% 7% 13% 26% 10% 1	4080
	21st to end	Day	28% 7% 17% 26% 19% 3	4531
September	1st to 10th	Day	32% 6% 11% 28% 19% 3	2180
	11th to 20th	Day	26% 6% 16% 33% 18% 1	2090
	21st to end	Day	28% 6% 11% 31% 22% 3	2090
October	1st to 10th	Day	23% 3 8% 24% 38% 4	3305
	11th to 20th	Day	26% 4 15% 29% 20% 5%	3140
	21st to end	Day	35% 4 13% 26% 19% 3	3248
November	1st to 10th	Day	35% 6% 18% 26% 14% 2	1763
	11th to 20th	Day	38% 6% 15% 24% 14% 2	1749
	21st to end	Day	40% 4 16% 26% 13% 1	1600
December	1st to 10th	Day	40% 6% 17% 26% 9% 1	2610
	11th to 20th	Day	46% 6% 19% 20% 9%	2876
	21st to end	Day	52% 5% 12% 24% 5% 1	3590
January	1st to 10th	Night	55% 7% 13% 17% 7% 1	4557
	11th to 20th	Night	46% 7% 15% 22% 8% 2	4508
	21st to end	Night	46% 8% 17% 20% 9% 1	4546
February	1st to 10th	Night	46% 6% 15% 21% 11% 1	2470
	11th to 20th	Night	42% 5% 15% 22% 12% 4	2349
	21st to end	Night	41% 5% 13% 25% 13% 3	1884
March	1st to 10th	Night	31% 6% 13% 25% 23% 2	3588
	11th to 20th	Night	32% 5% 10% 29% 20% 3	3480
	21st to end	Night	53% 9% 16% 17% 5% 1	3817
April	1st to 10th	Night	40% 7% 14% 24% 14% 1	2025
	11th to 20th	Night	41% 5% 10% 22% 20% 2	1689
	21st to end	Night	41% 8% 12% 24% 14% 2	1710
May	1st to 10th	Night	36% 7% 15% 20% 18% 3	2850
	11th to 20th	Night	29% 8% 13% 26% 22% 3	2824
	21st to end	Night	38% 6% 13% 26% 15% 1	2949
June	1st to 10th	Night	26% 8% 16% 28% 19% 3	1387
	11th to 20th	Night	28% 6% 16% 24% 21% 4	1330
	21st to end	Night	22% 7% 16% 32% 20% 3	1330
July	1st to 10th	Night	31% 5% 22% 26% 12% 4	2395
	11th to 20th	Night	20% 5% 14% 37% 19% 5%	2492
	21st to end	Night	17% 8% 18% 30% 22% 4	2999
August	1st to 10th	Night	29% 7% 16% 30% 16% 2	2826
	11th to 20th	Night	34% 7% 15% 28% 15% 2	2825
	21st to end	Night	27% 7% 17% 24% 22% 4	3135
September	1st to 10th	Night	26% 6% 12% 28% 23% 5%	1995
	11th to 20th	Night	25% 5% 13% 33% 21% 2	2090
	21st to end	Night	24% 5% 10% 31% 25% 4	2090
October	1st to 10th	Night	20% 3 6% 19% 48% 5%	3622
	11th to 20th	Night	23% 4 11% 32% 26% 5%	3779
	21st to end	Night	35% 4 13% 27% 19% 1	4304
November	1st to 10th	Night	30% 5% 14% 25% 21% 4	2535
	11th to 20th	Night	34% 6% 14% 25% 18% 3	2649
	21st to end	Night	33% 6% 16% 28% 16% 1	2800
December	1st to 10th	Night	37% 4 15% 32% 11% 1	4580
	11th to 20th	Night	44% 7% 16% 25% 7%	5311
	21st to end	Night	54% 5% 13% 22% 7%	7371

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% 30% 28% 10% 3	300
	11th to 20th	Day	15% 13% 35% 30% 7% 1	300
	21st to end	Day	13% 10% 42% 25% 10% 1	300
February	1st to 10th	Day	10% 16% 40% 30% 4	270
	11th to 20th	Day	15% 13% 39% 26% 7% 1	270
	21st to end	Day	16% 13% 42% 24% 4	225
March	1st to 10th	Day	14% 12% 40% 29% 3 1	270
	11th to 20th	Day	19% 12% 36% 23% 10% 1	270
	21st to end	Day	28% 11% 36% 18% 5% 1	297
April	1st to 10th	Day	21% 18% 37% 19% 4	331
	11th to 20th	Day	23% 17% 29% 25% 6%	640
	21st to end	Day	24% 12% 31% 22% 9% 2	650
May	1st to 10th	Day	19% 12% 33% 26% 9% 1	653
	11th to 20th	Day	18% 11% 29% 24% 16% 2	675
	21st to end	Day	17% 11% 29% 28% 11% 3	734
June	1st to 10th	Day	8% 9% 24% 34% 21% 4	680
	11th to 20th	Day	12% 8% 34% 30% 14% 2	680
	21st to end	Day	10% 7% 28% 37% 17% 2	680
July	1st to 10th	Day	6% 3 22% 36% 27% 6%	671
	11th to 20th	Day	7% 3 26% 42% 19% 3	668
	21st to end	Day	5% 3 24% 45% 19% 4	739
August	1st to 10th	Day	9% 4 21% 42% 21% 3	676
	11th to 20th	Day	11% 3 23% 36% 21% 5%	665
	21st to end	Day	7% 4 26% 37% 23% 3	748
September	1st to 10th	Day	15% 5% 29% 31% 18% 3	390
	11th to 20th	Day	8% 4 35% 32% 17% 3	300
	21st to end	Day	14% 13% 28% 27% 13% 4	300
October	1st to 10th	Day	18% 8% 27% 29% 14% 4	300
	11th to 20th	Day	15% 16% 35% 23% 9% 1	300
	21st to end	Day	18% 14% 36% 23% 8% 1	330
November	1st to 10th	Day	19% 11% 33% 24% 9% 3	300
	11th to 20th	Day	14% 17% 39% 24% 6%	300
	21st to end	Day	18% 18% 30% 24% 10% 1	300
December	1st to 10th	Day	13% 11% 36% 29% 10% 1	300
	11th to 20th	Day	15% 13% 39% 25% 8%	300
	21st to end	Day	21% 12% 35% 26% 6%	330
January	1st to 10th	Night	12% 10% 37% 33% 8% 1	1000
	11th to 20th	Night	11% 15% 35% 30% 7% 1	1000
	21st to end	Night	13% 9% 40% 30% 8%	1051
February	1st to 10th	Night	15% 10% 40% 29% 6%	950
	11th to 20th	Night	12% 12% 38% 32% 6%	874
	21st to end	Night	15% 8% 36% 32% 8% 1	628
March	1st to 10th	Night	12% 10% 42% 30% 6% 1	679
	11th to 20th	Night	15% 9% 41% 29% 6%	570
	21st to end	Night	19% 10% 38% 26% 6%	627
April	1st to 10th	Night	16% 15% 39% 28% 2	570
	11th to 20th	Night	17% 14% 36% 27% 7%	563
	21st to end	Night	18% 10% 37% 28% 7% 1	570
May	1st to 10th	Night	16% 9% 36% 30% 9% 1	570
	11th to 20th	Night	15% 9% 29% 35% 12%	561
	21st to end	Night	19% 5% 33% 35% 9%	617
June	1st to 10th	Night	8% 6% 27% 41% 18% 1	570
	11th to 20th	Night	10% 3 32% 42% 12% 1	570
	21st to end	Night	6% 4 27% 47% 16%	570
July	1st to 10th	Night	6% 3 20% 44% 26% 1	555
	11th to 20th	Night	4 1 21% 56% 17%	552
	21st to end	Night	4 1 22% 55% 17%	624
August	1st to 10th	Night	7% 4 23% 47% 19% 1	567
	11th to 20th	Night	8% 3 24% 43% 21%	564
	21st to end	Night	7% 3 28% 44% 18% 1	627
September	1st to 10th	Night	9% 5% 27% 41% 16% 2	570
	11th to 20th	Night	8% 4 33% 38% 14% 2	570
	21st to end	Night	10% 6% 36% 34% 14% 1	570
October	1st to 10th	Night	20% 7% 29% 34% 10% 1	647
	11th to 20th	Night	15% 11% 37% 29% 8% 1	760
	21st to end	Night	16% 13% 32% 31% 9%	945
November	1st to 10th	Night	12% 9% 36% 33% 9% 1	975
	11th to 20th	Night	11% 12% 38% 31% 7%	1000
	21st to end	Night	11% 10% 36% 34% 9%	1000
December	1st to 10th	Night	13% 10% 39% 32% 6%	1000
	11th to 20th	Night	14% 8% 37% 33% 8% 1	1000
	21st to end	Night	21% 9% 35% 28% 6% 1	1100

Page generated at 2025-01-19 02:06:50. Version ac07

Copyright © 2025 Attilla Danko.