Syracuse
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Syracuse clear sky chart from 2005-11-06 to 2024-09-14.

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	16% 11% 4 9% 5% 5% 4 4 5% 7% 30%	100997
	Night	18% 13% 4 10% 5% 4 4 3 5% 6% 28%	96906
Transparency	Day	53% 7% 12% 19% 9% 1	100755
	Night	57% 7% 11% 16% 8% 1	96768
Seeing	Day	24% 17% 29% 18% 8% 3	14461
	Night	25% 16% 26% 23% 8% 1	23635

By Month

Percentage Cloud Cover NE (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	13% 22% 7% 15% 5% 4 4 3 4 4 17%	2517
	11th to 20th	Day	14% 22% 9% 15% 10% 5% 4 3 4 4 12%	2520
	21st to end	Day	19% 20% 7% 14% 8% 5% 5% 3 4 4 12%	3069
February	1st to 10th	Day	15% 18% 5% 15% 10% 6% 5% 3 4 4 13%	1710
	11th to 20th	Day	14% 17% 6% 19% 9% 5% 5% 3 4 4 15%	1693
	21st to end	Day	18% 17% 5% 15% 8% 4 4 3 4 4 18%	1570
March	1st to 10th	Day	23% 14% 5% 10% 5% 4 3 2 3 5% 25%	3177
	11th to 20th	Day	11% 21% 5% 10% 5% 5% 3 3 4 6% 26%	3480
	21st to end	Day	17% 13% 4 10% 4 3 3 3 4 6% 32%	3993
April	1st to 10th	Day	20% 13% 4 9% 4 4 4 3 4 6% 29%	2280
	11th to 20th	Day	18% 10% 3 7% 5% 4 4 3 5% 7% 34%	2254
	21st to end	Day	21% 12% 3 6% 5% 4 3 3 5% 6% 32%	2308
May	1st to 10th	Day	23% 10% 2 7% 4 4 4 3 5% 6% 32%	4380
	11th to 20th	Day	16% 8% 3 9% 6% 5% 5% 4 6% 8% 30%	4398
	21st to end	Day	13% 6% 2 6% 4 5% 4 4 7% 9% 41%	4837
June	1st to 10th	Day	18% 8% 2 8% 5% 4 5% 4 6% 8% 32%	2660
	11th to 20th	Day	16% 6% 2 6% 5% 5% 5% 5% 7% 9% 35%	2660
	21st to end	Day	15% 7% 2 6% 6% 5% 5% 5% 7% 8% 33%	2660
July	1st to 10th	Day	11% 5% 2 6% 5% 5% 5% 5% 8% 11% 37%	4440
	11th to 20th	Day	10% 5% 2 7% 5% 5% 6% 5% 9% 11% 35%	4440
	21st to end	Day	10% 6% 3 7% 6% 5% 6% 5% 7% 9% 37%	4814
August	1st to 10th	Day	17% 6% 3 7% 4 4 5% 4 7% 8% 34%	4146
	11th to 20th	Day	14% 7% 3 8% 5% 5% 5% 4 6% 8% 33%	3930
	21st to end	Day	16% 7% 3 6% 5% 5% 4 3 5% 8% 39%	4180
September	1st to 10th	Day	15% 6% 2 5% 4 5% 4 4 6% 8% 41%	2280
	11th to 20th	Day	15% 7% 2 6% 4 4 4 3 5% 7% 43%	2198
	21st to end	Day	16% 7% 3 7% 5% 4 4 4 7% 5% 36%	1921
October	1st to 10th	Day	20% 8% 2 8% 5% 5% 4 4 5% 8% 32%	1800
	11th to 20th	Day	20% 10% 3 6% 5% 4 5% 4 6% 8% 30%	1800
	21st to end	Day	26% 14% 3 8% 5% 4 5% 3 4 6% 22%	1899
November	1st to 10th	Day	15% 12% 4 9% 6% 6% 4 3 5% 6% 31%	1671
	11th to 20th	Day	16% 15% 5% 9% 6% 5% 5% 4 5% 6% 25%	1594
	21st to end	Day	20% 17% 5% 10% 7% 5% 4 3 4 7% 19%	1520
December	1st to 10th	Day	19% 21% 7% 14% 6% 4 4 3 5% 5% 13%	1520
	11th to 20th	Day	20% 19% 7% 12% 5% 5% 4 3 3 5% 17%	1906
	21st to end	Day	26% 20% 7% 10% 5% 4 4 3 4 5% 12%	2772
January	1st to 10th	Night	17% 22% 7% 18% 7% 5% 4 3 4 4 11%	4429
	11th to 20th	Night	13% 20% 9% 15% 7% 5% 4 3 4 4 16%	4440
	21st to end	Night	21% 20% 7% 16% 8% 6% 3 2 3 3 12%	4582
February	1st to 10th	Night	15% 19% 6% 15% 7% 5% 4 3 4 5% 17%	2470
	11th to 20th	Night	14% 15% 6% 17% 9% 6% 6% 3 3 5% 16%	2371
	21st to end	Night	18% 14% 6% 15% 7% 4 4 3 4 5% 19%	1884
March	1st to 10th	Night	20% 13% 5% 10% 6% 4 4 3 5% 6% 26%	3660
	11th to 20th	Night	15% 22% 6% 9% 5% 4 4 3 4 5% 22%	3479
	21st to end	Night	20% 12% 4 11% 5% 4 4 3 3 4 30%	3638
April	1st to 10th	Night	19% 14% 4 8% 5% 5% 5% 3 5% 6% 27%	1900
	11th to 20th	Night	19% 11% 3 8% 4 5% 4 4 5% 5% 33%	1875
	21st to end	Night	21% 11% 3 6% 4 3 4 3 4 6% 34%	1889
May	1st to 10th	Night	24% 10% 3 8% 5% 4 4 3 5% 6% 29%	2559
	11th to 20th	Night	16% 9% 3 7% 5% 4 5% 4 6% 7% 34%	2495
	21st to end	Night	13% 6% 2 6% 4 4 5% 4 7% 8% 40%	2738
June	1st to 10th	Night	18% 6% 3 7% 5% 4 4 4 6% 7% 36%	1520
	11th to 20th	Night	16% 6% 3 6% 4 4 4 5% 6% 9% 38%	1520
	21st to end	Night	13% 7% 3 7% 5% 4 5% 4 6% 7% 40%	1520
July	1st to 10th	Night	11% 5% 3 8% 6% 5% 5% 4 8% 7% 38%	2520
	11th to 20th	Night	11% 5% 2 6% 4 5% 4 4 7% 9% 43%	2520
	21st to end	Night	12% 6% 2 6% 5% 4 5% 4 6% 8% 42%	2739
August	1st to 10th	Night	16% 7% 3 6% 4 4 5% 4 6% 7% 38%	2779
	11th to 20th	Night	12% 7% 3 8% 5% 4 4 4 6% 7% 40%	2867
	21st to end	Night	12% 6% 2 6% 4 4 4 4 6% 9% 43%	3476
September	1st to 10th	Night	15% 6% 2 5% 4 4 5% 3 6% 6% 43%	1900
	11th to 20th	Night	16% 6% 1 6% 4 3 4 3 4 6% 47%	1840
	21st to end	Night	17% 6% 1 5% 4 4 6% 4 7% 7% 38%	2037
October	1st to 10th	Night	22% 8% 3 7% 5% 5% 5% 4 5% 6% 32%	2160
	11th to 20th	Night	22% 10% 3 6% 4 4 5% 3 5% 6% 31%	2160
	21st to end	Night	28% 12% 4 9% 4 3 4 3 4 6% 23%	2456
November	1st to 10th	Night	16% 14% 3 8% 5% 4 4 4 4 6% 32%	2407
	11th to 20th	Night	18% 15% 4 8% 6% 3 5% 4 5% 6% 27%	2584
	21st to end	Night	17% 19% 5% 9% 5% 5% 4 4 5% 6% 22%	2660
December	1st to 10th	Night	20% 21% 8% 10% 5% 4 4 4 4 5% 14%	2660
	11th to 20th	Night	20% 16% 8% 12% 5% 5% 5% 3 5% 4 17%	3288
	21st to end	Night	29% 19% 6% 9% 5% 4 3 3 4 5% 14%	4884

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	71% 7% 11% 9% 2	2518
	11th to 20th	Day	76% 6% 8% 7% 2	2520
	21st to end	Day	77% 4 10% 6% 2	3069
February	1st to 10th	Day	74% 6% 8% 10% 2	1710
	11th to 20th	Day	73% 6% 7% 11% 3	1702
	21st to end	Day	71% 4 9% 12% 4	1570
March	1st to 10th	Day	63% 7% 9% 15% 6%	3180
	11th to 20th	Day	59% 6% 16% 10% 9% 1	3480
	21st to end	Day	54% 6% 8% 19% 12% 1	3993
April	1st to 10th	Day	57% 6% 8% 18% 9% 2	2280
	11th to 20th	Day	50% 7% 10% 20% 12% 1	2254
	21st to end	Day	53% 6% 9% 18% 11% 2	2308
May	1st to 10th	Day	53% 6% 10% 18% 11% 1	4394
	11th to 20th	Day	50% 9% 12% 21% 7% 1	4402
	21st to end	Day	39% 9% 14% 24% 13% 1	4837
June	1st to 10th	Day	49% 9% 10% 19% 12% 1	2660
	11th to 20th	Day	44% 8% 13% 22% 11% 1	2660
	21st to end	Day	45% 9% 14% 20% 10% 1	2660
July	1st to 10th	Day	39% 7% 15% 26% 12% 1	4370
	11th to 20th	Day	37% 9% 16% 27% 10%	4365
	21st to end	Day	40% 9% 16% 24% 11%	4661
August	1st to 10th	Day	45% 8% 15% 19% 13% 1	4132
	11th to 20th	Day	46% 8% 17% 22% 7%	3969
	21st to end	Day	43% 6% 13% 31% 7% 1	4180
September	1st to 10th	Day	40% 9% 12% 27% 11% 1	2280
	11th to 20th	Day	40% 7% 11% 24% 16% 1	2198
	21st to end	Day	46% 7% 11% 25% 10% 1	1921
October	1st to 10th	Day	49% 7% 14% 18% 11% 1	1800
	11th to 20th	Day	51% 8% 15% 19% 7%	1800
	21st to end	Day	63% 7% 11% 12% 7% 1	1899
November	1st to 10th	Day	53% 8% 11% 16% 11% 1	1671
	11th to 20th	Day	60% 6% 11% 15% 7% 2	1594
	21st to end	Day	66% 6% 14% 12% 2	1520
December	1st to 10th	Day	73% 7% 10% 9% 2	1520
	11th to 20th	Day	70% 7% 13% 7% 3	1906
	21st to end	Day	75% 6% 8% 8% 2	2772
January	1st to 10th	Night	78% 5% 10% 6% 2	4429
	11th to 20th	Night	72% 7% 8% 9% 4	4440
	21st to end	Night	80% 4 8% 6% 2	4582
February	1st to 10th	Night	70% 6% 8% 11% 5%	2470
	11th to 20th	Night	71% 6% 8% 10% 4	2373
	21st to end	Night	67% 6% 11% 10% 6%	1884
March	1st to 10th	Night	58% 7% 12% 16% 7%	3670
	11th to 20th	Night	63% 6% 13% 13% 5%	3480
	21st to end	Night	56% 7% 6% 20% 10% 2	3638
April	1st to 10th	Night	57% 7% 10% 16% 7% 2	1900
	11th to 20th	Night	53% 7% 9% 17% 14% 1	1875
	21st to end	Night	51% 5% 11% 17% 13% 3	1889
May	1st to 10th	Night	55% 5% 12% 15% 9% 4	2565
	11th to 20th	Night	47% 9% 15% 20% 8% 1	2496
	21st to end	Night	38% 10% 14% 19% 17% 2	2739
June	1st to 10th	Night	46% 7% 12% 21% 13% 1	1520
	11th to 20th	Night	43% 7% 13% 21% 14% 2	1520
	21st to end	Night	43% 7% 11% 26% 13% 1	1520
July	1st to 10th	Night	42% 8% 12% 22% 15% 1	2480
	11th to 20th	Night	37% 8% 15% 27% 12% 1	2472
	21st to end	Night	39% 7% 11% 26% 15% 1	2651
August	1st to 10th	Night	43% 8% 15% 25% 9%	2769
	11th to 20th	Night	43% 8% 17% 24% 9%	2894
	21st to end	Night	36% 7% 14% 32% 10% 1	3476
September	1st to 10th	Night	40% 8% 13% 25% 13% 2	1900
	11th to 20th	Night	39% 5% 12% 27% 16% 1	1840
	21st to end	Night	43% 8% 13% 24% 11% 1	2037
October	1st to 10th	Night	52% 7% 12% 17% 12%	2160
	11th to 20th	Night	53% 7% 14% 16% 8% 1	2160
	21st to end	Night	64% 5% 11% 13% 6% 1	2456
November	1st to 10th	Night	54% 6% 11% 17% 10% 2	2407
	11th to 20th	Night	57% 7% 12% 16% 6% 2	2584
	21st to end	Night	63% 6% 14% 13% 4	2660
December	1st to 10th	Night	73% 5% 12% 8% 2	2660
	11th to 20th	Night	69% 7% 10% 9% 4	3288
	21st to end	Night	74% 5% 9% 10% 1	4884

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	34% 23% 28% 11% 4	180
	11th to 20th	Day	36% 27% 29% 7% 1 1	180
	21st to end	Day	26% 26% 37% 8% 2	283
February	1st to 10th	Day	34% 30% 30% 5%	270
	11th to 20th	Day	34% 32% 29% 5%	300
	21st to end	Day	38% 22% 28% 10% 1	382
March	1st to 10th	Day	33% 22% 28% 14% 3	460
	11th to 20th	Day	32% 23% 29% 13% 3	460
	21st to end	Day	35% 21% 27% 12% 4 1	506
April	1st to 10th	Day	34% 22% 27% 13% 5%	460
	11th to 20th	Day	31% 25% 22% 12% 7% 3	452
	21st to end	Day	34% 17% 27% 15% 5% 2	460
May	1st to 10th	Day	27% 19% 30% 15% 8% 2	463
	11th to 20th	Day	21% 14% 32% 22% 8% 2	487
	21st to end	Day	19% 12% 31% 23% 11% 3	529
June	1st to 10th	Day	23% 17% 27% 22% 9% 2	490
	11th to 20th	Day	17% 13% 31% 25% 12% 2	490
	21st to end	Day	17% 19% 32% 23% 7% 2	490
July	1st to 10th	Day	12% 9% 31% 29% 16% 4	485
	11th to 20th	Day	13% 8% 28% 31% 16% 3	484
	21st to end	Day	13% 8% 37% 26% 13% 3	532
August	1st to 10th	Day	13% 10% 29% 27% 15% 7%	486
	11th to 20th	Day	15% 11% 26% 28% 13% 6%	479
	21st to end	Day	14% 13% 32% 21% 14% 7%	539
September	1st to 10th	Day	18% 13% 23% 25% 14% 7%	490
	11th to 20th	Day	13% 12% 24% 23% 17% 10%	463
	21st to end	Day	16% 15% 28% 24% 12% 4	450
October	1st to 10th	Day	23% 14% 28% 17% 15% 4	450
	11th to 20th	Day	28% 20% 26% 18% 7% 1	450
	21st to end	Day	36% 16% 30% 15% 4	454
November	1st to 10th	Day	27% 21% 24% 19% 8% 1	365
	11th to 20th	Day	33% 26% 25% 15% 1 1	254
	21st to end	Day	38% 18% 35% 9%	180
December	1st to 10th	Day	37% 22% 28% 9% 3 1	180
	11th to 20th	Day	33% 27% 29% 9% 1	180
	21st to end	Day	35% 25% 29% 10% 1	198
January	1st to 10th	Night	30% 25% 30% 13% 2	760
	11th to 20th	Night	29% 24% 28% 15% 3	760
	21st to end	Night	22% 25% 34% 17% 3	836
February	1st to 10th	Night	30% 21% 32% 16% 1	760
	11th to 20th	Night	27% 26% 31% 14% 2	743
	21st to end	Night	29% 24% 29% 15% 3	628
March	1st to 10th	Night	28% 21% 29% 19% 3	760
	11th to 20th	Night	27% 23% 27% 20% 3	760
	21st to end	Night	28% 20% 25% 19% 6%	836
April	1st to 10th	Night	28% 17% 30% 22% 3	760
	11th to 20th	Night	26% 19% 26% 21% 7% 1	751
	21st to end	Night	27% 14% 24% 27% 7%	749
May	1st to 10th	Night	25% 13% 22% 31% 9% 1	412
	11th to 20th	Night	16% 10% 33% 33% 7% 1	374
	21st to end	Night	13% 10% 29% 34% 14%	411
June	1st to 10th	Night	21% 8% 20% 39% 12% 1	380
	11th to 20th	Night	17% 8% 23% 36% 16%	380
	21st to end	Night	16% 6% 27% 42% 9% 1	380
July	1st to 10th	Night	10% 5% 19% 47% 18% 2	370
	11th to 20th	Night	12% 4 19% 44% 19% 2	368
	21st to end	Night	13% 6% 22% 44% 13% 1	416
August	1st to 10th	Night	14% 5% 22% 37% 21% 1	534
	11th to 20th	Night	14% 6% 22% 31% 25% 2	607
	21st to end	Night	16% 6% 21% 35% 21% 1	836
September	1st to 10th	Night	17% 7% 24% 31% 19% 2	760
	11th to 20th	Night	17% 7% 19% 30% 22% 4	736
	21st to end	Night	18% 12% 21% 29% 17% 2	720
October	1st to 10th	Night	28% 11% 23% 21% 16% 1	720
	11th to 20th	Night	27% 15% 28% 23% 6%	720
	21st to end	Night	36% 16% 25% 19% 3	792
November	1st to 10th	Night	27% 17% 27% 21% 8%	740
	11th to 20th	Night	29% 22% 26% 16% 5% 1	760
	21st to end	Night	29% 23% 28% 16% 5%	760
December	1st to 10th	Night	34% 24% 26% 13% 2	760
	11th to 20th	Night	32% 23% 27% 14% 3	760
	21st to end	Night	33% 24% 27% 14% 2	836

Page generated at 2024-09-11 10:00:04. Version ac07

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