Wingham
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wingham clear sky chart from 2005-11-06 to 2026-07-01.

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% 12% 5% 10% 6% 5% 4 3 5% 6% 30%	137857
	Night	14% 13% 5% 12% 6% 5% 4 3 5% 5% 27%	134517
Transparency	Day	54% 4 10% 19% 11% 1	141423
	Night	58% 4 9% 17% 10% 1	139040
Seeing	Day	20% 12% 29% 23% 11% 4	17255
	Night	21% 11% 29% 27% 11% 1	26499

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	14% 19% 10% 21% 9% 5% 4 3 3 5% 7%	4313
	11th to 20th	Day	8% 22% 11% 27% 15% 8% 2 1 1 1 3	4977
	21st to end	Day	11% 17% 8% 21% 12% 10% 6% 3 3 3 7%	5780
February	1st to 10th	Day	13% 20% 7% 18% 10% 5% 4 3 3 4 13%	1890
	11th to 20th	Day	12% 14% 10% 18% 12% 5% 4 3 4 4 13%	1843
	21st to end	Day	15% 20% 6% 12% 8% 5% 5% 4 4 4 19%	1713
March	1st to 10th	Day	14% 13% 6% 16% 8% 4 3 3 4 5% 24%	4895
	11th to 20th	Day	10% 16% 7% 11% 4 4 3 4 6% 7% 27%	5090
	21st to end	Day	18% 15% 7% 12% 5% 4 3 3 4 5% 24%	5586
April	1st to 10th	Day	17% 16% 6% 9% 4 4 4 3 5% 5% 28%	2399
	11th to 20th	Day	19% 13% 3 6% 4 4 4 3 4 6% 34%	2702
	21st to end	Day	19% 11% 4 7% 4 4 4 3 5% 8% 33%	2730
May	1st to 10th	Day	15% 9% 3 7% 4 5% 4 3 6% 7% 36%	7642
	11th to 20th	Day	14% 11% 2 7% 4 4 5% 3 6% 8% 36%	7781
	21st to end	Day	17% 9% 2 5% 3 3 3 3 4 7% 44%	9060
June	1st to 10th	Day	13% 7% 2 7% 5% 5% 5% 4 6% 7% 39%	3031
	11th to 20th	Day	11% 6% 2 6% 4 4 5% 4 6% 9% 41%	3150
	21st to end	Day	16% 6% 2 6% 4 4 4 4 5% 8% 41%	3150
July	1st to 10th	Day	11% 6% 3 7% 5% 4 5% 4 6% 8% 41%	6820
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 6% 8% 47%	6393
	21st to end	Day	8% 5% 2 4 4 4 4 4 7% 9% 48%	6424
August	1st to 10th	Day	12% 6% 2 7% 4 6% 5% 5% 7% 8% 37%	4234
	11th to 20th	Day	13% 7% 2 7% 5% 5% 6% 6% 7% 10% 34%	4174
	21st to end	Day	10% 6% 2 6% 4 4 5% 4 7% 9% 42%	4642
September	1st to 10th	Day	11% 7% 3 7% 5% 5% 5% 4 6% 9% 39%	2351
	11th to 20th	Day	12% 6% 2 6% 4 3 4 3 6% 8% 45%	2200
	21st to end	Day	17% 8% 3 6% 5% 5% 5% 3 7% 8% 34%	2200
October	1st to 10th	Day	18% 8% 3 8% 4 5% 4 3 5% 7% 35%	2040
	11th to 20th	Day	21% 15% 3 9% 5% 5% 5% 3 6% 6% 22%	2000
	21st to end	Day	25% 17% 3 8% 5% 5% 4 3 5% 6% 18%	2134
November	1st to 10th	Day	16% 19% 4 9% 5% 5% 4 3 4 7% 25%	1852
	11th to 20th	Day	15% 21% 4 11% 6% 5% 5% 3 6% 6% 18%	1682
	21st to end	Day	17% 26% 9% 11% 6% 5% 4 3 5% 5% 11%	1680
December	1st to 10th	Day	15% 30% 13% 14% 6% 4 4 3 3 3 6%	2680
	11th to 20th	Day	20% 23% 8% 17% 7% 4 4 2 4 4 8%	3066
	21st to end	Day	23% 23% 8% 12% 5% 5% 3 3 4 4 9%	3553
January	1st to 10th	Night	12% 18% 10% 25% 10% 6% 4 3 3 3 6%	8609
	11th to 20th	Night	9% 20% 10% 24% 15% 7% 4 2 2 2 4	7904
	21st to end	Night	11% 15% 8% 19% 11% 9% 7% 3 4 4 8%	8401
February	1st to 10th	Night	13% 19% 5% 16% 11% 6% 4 3 4 4 14%	2730
	11th to 20th	Night	12% 15% 7% 17% 9% 7% 5% 3 5% 6% 15%	2663
	21st to end	Night	13% 15% 6% 14% 8% 5% 4 3 5% 5% 20%	2092
March	1st to 10th	Night	12% 14% 5% 11% 7% 5% 4 4 5% 5% 28%	5163
	11th to 20th	Night	8% 13% 6% 10% 5% 5% 5% 4 6% 8% 31%	5089
	21st to end	Night	18% 12% 5% 12% 5% 4 4 3 4 4 29%	5588
April	1st to 10th	Night	18% 15% 4 8% 4 4 4 3 4 6% 29%	2226
	11th to 20th	Night	17% 11% 3 6% 4 4 4 3 5% 6% 35%	1879
	21st to end	Night	16% 11% 3 8% 5% 5% 4 4 6% 6% 32%	1890
May	1st to 10th	Night	16% 9% 3 7% 5% 4 4 3 5% 7% 39%	5257
	11th to 20th	Night	16% 8% 3 7% 4 4 3 3 5% 6% 40%	5063
	21st to end	Night	18% 7% 2 5% 3 3 3 3 4 6% 46%	5114
June	1st to 10th	Night	13% 7% 2 6% 5% 3 4 4 6% 7% 43%	1583
	11th to 20th	Night	11% 6% 2 7% 5% 5% 5% 5% 6% 10% 39%	1470
	21st to end	Night	12% 6% 2 7% 4 4 4 4 5% 8% 44%	1470
July	1st to 10th	Night	9% 6% 3 7% 4 5% 4 3 5% 8% 46%	3160
	11th to 20th	Night	11% 7% 2 5% 3 3 3 3 5% 7% 50%	3558
	21st to end	Night	9% 6% 2 5% 4 4 4 4 6% 6% 50%	4428
August	1st to 10th	Night	11% 6% 2 6% 5% 5% 4 4 6% 7% 45%	2915
	11th to 20th	Night	14% 8% 3 6% 4 4 4 3 5% 8% 41%	2875
	21st to end	Night	11% 5% 2 7% 4 4 4 3 5% 7% 48%	3223
September	1st to 10th	Night	10% 5% 2 6% 5% 4 4 4 6% 8% 45%	2044
	11th to 20th	Night	10% 5% 2 4 3 3 4 4 5% 7% 52%	2200
	21st to end	Night	15% 8% 3 8% 4 4 4 3 5% 6% 38%	2200
October	1st to 10th	Night	17% 9% 2 7% 4 4 3 3 5% 7% 39%	2360
	11th to 20th	Night	21% 12% 3 8% 5% 4 5% 3 5% 7% 26%	2400
	21st to end	Night	23% 14% 4 9% 6% 5% 3 3 5% 4 23%	2705
November	1st to 10th	Night	16% 14% 4 9% 6% 5% 4 3 5% 6% 28%	2666
	11th to 20th	Night	15% 19% 6% 10% 5% 5% 5% 4 5% 5% 19%	2935
	21st to end	Night	20% 21% 7% 11% 5% 4 4 3 4 5% 15%	2940
December	1st to 10th	Night	12% 24% 8% 18% 7% 6% 6% 4 4 4 7%	4720
	11th to 20th	Night	12% 25% 9% 17% 6% 5% 4 3 4 4 11%	5348
	21st to end	Night	21% 21% 9% 13% 6% 4 4 3 4 4 10%	7649

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	80% 3 7% 7% 3	4314
	11th to 20th	Day	92% 2 3 2 1	5011
	21st to end	Day	84% 4 6% 4 2	5780
February	1st to 10th	Day	77% 4 6% 11% 2	1890
	11th to 20th	Day	74% 6% 6% 10% 3 1	1852
	21st to end	Day	70% 5% 8% 12% 6%	1713
March	1st to 10th	Day	64% 3 13% 13% 7%	4898
	11th to 20th	Day	57% 4 13% 18% 6% 2	5090
	21st to end	Day	63% 4 9% 15% 8% 1	5586
April	1st to 10th	Day	58% 5% 10% 17% 10%	2399
	11th to 20th	Day	51% 4 10% 21% 13% 1	2702
	21st to end	Day	51% 4 12% 20% 11% 2	2730
May	1st to 10th	Day	47% 3 12% 21% 13% 4	7651
	11th to 20th	Day	47% 5% 10% 21% 15% 1	7785
	21st to end	Day	43% 3 7% 26% 17% 3	9061
June	1st to 10th	Day	42% 6% 11% 23% 16% 2	3031
	11th to 20th	Day	39% 6% 12% 26% 16% 1	3150
	21st to end	Day	43% 5% 12% 25% 14% 1	3150
July	1st to 10th	Day	40% 3 13% 23% 19% 1	6747
	11th to 20th	Day	35% 4 11% 33% 17% 1	6314
	21st to end	Day	33% 4 13% 29% 20% 2	6240
August	1st to 10th	Day	42% 7% 13% 24% 14% 1	4221
	11th to 20th	Day	45% 6% 15% 24% 10%	4213
	21st to end	Day	38% 4 14% 31% 13% 1	4642
September	1st to 10th	Day	41% 6% 14% 25% 12% 2	2351
	11th to 20th	Day	36% 6% 13% 31% 14%	2200
	21st to end	Day	47% 6% 13% 24% 9% 1	2200
October	1st to 10th	Day	45% 5% 10% 25% 14% 2	3326
	11th to 20th	Day	49% 3 12% 23% 12%	3240
	21st to end	Day	60% 4 14% 17% 5%	3423
November	1st to 10th	Day	60% 6% 9% 18% 7%	1852
	11th to 20th	Day	64% 6% 10% 11% 6% 1	1682
	21st to end	Day	75% 6% 8% 9% 2	1680
December	1st to 10th	Day	85% 3 6% 5% 1	2680
	11th to 20th	Day	81% 4 6% 7% 2	3066
	21st to end	Day	79% 4 7% 7% 3	3553
January	1st to 10th	Night	82% 3 6% 8% 2	8609
	11th to 20th	Night	88% 3 4 4 2	7945
	21st to end	Night	80% 3 7% 6% 3	8401
February	1st to 10th	Night	74% 5% 7% 12% 3	2730
	11th to 20th	Night	69% 6% 9% 12% 4	2665
	21st to end	Night	64% 6% 10% 14% 7%	2092
March	1st to 10th	Night	58% 5% 12% 16% 9% 1	5173
	11th to 20th	Night	51% 4 16% 20% 8% 1	5090
	21st to end	Night	56% 5% 9% 17% 11% 1	5588
April	1st to 10th	Night	57% 5% 8% 17% 12% 1	2226
	11th to 20th	Night	50% 4 9% 19% 16% 1	1879
	21st to end	Night	51% 5% 10% 17% 15% 2	1890
May	1st to 10th	Night	45% 4 9% 21% 15% 6%	5264
	11th to 20th	Night	45% 5% 10% 23% 16% 1	5064
	21st to end	Night	40% 4 8% 28% 18% 2	5115
June	1st to 10th	Night	39% 6% 9% 25% 19% 2	1583
	11th to 20th	Night	40% 5% 12% 24% 16% 3	1470
	21st to end	Night	37% 6% 12% 26% 18% 1	1470
July	1st to 10th	Night	37% 3 12% 24% 19% 4	3125
	11th to 20th	Night	34% 3 10% 30% 20% 2	3514
	21st to end	Night	35% 4 11% 29% 20% 1	4297
August	1st to 10th	Night	39% 4 12% 27% 17% 1	2904
	11th to 20th	Night	42% 5% 14% 26% 13% 1	2902
	21st to end	Night	36% 4 10% 34% 14% 1	3223
September	1st to 10th	Night	37% 6% 11% 29% 15% 2	2044
	11th to 20th	Night	31% 6% 13% 32% 18% 1	2200
	21st to end	Night	46% 6% 12% 24% 12% 1	2200
October	1st to 10th	Night	37% 5% 8% 28% 21% 1	3854
	11th to 20th	Night	49% 3 15% 19% 14%	3899
	21st to end	Night	53% 4 15% 20% 8%	4366
November	1st to 10th	Night	56% 6% 10% 21% 7%	2666
	11th to 20th	Night	65% 6% 10% 13% 5% 1	2935
	21st to end	Night	72% 4 10% 10% 2	2940
December	1st to 10th	Night	81% 3 10% 5% 1	4720
	11th to 20th	Night	77% 4 8% 8% 3	5348
	21st to end	Night	78% 4 6% 9% 3	7649

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	24% 20% 36% 16% 4 1	261
	11th to 20th	Day	22% 23% 41% 11% 4 1	330
	21st to end	Day	25% 19% 34% 19% 2 1	363
February	1st to 10th	Day	23% 22% 38% 12% 4	330
	11th to 20th	Day	25% 22% 41% 11% 2	330
	21st to end	Day	28% 26% 31% 14% 1	273
March	1st to 10th	Day	25% 18% 37% 13% 6% 1	466
	11th to 20th	Day	25% 16% 32% 20% 6% 1	540
	21st to end	Day	30% 14% 32% 19% 5% 1	594
April	1st to 10th	Day	25% 19% 31% 18% 7% 1	540
	11th to 20th	Day	30% 16% 26% 15% 9% 4	532
	21st to end	Day	24% 11% 33% 21% 8% 2	540
May	1st to 10th	Day	19% 12% 32% 24% 10% 3	543
	11th to 20th	Day	21% 10% 26% 24% 15% 5%	567
	21st to end	Day	19% 7% 26% 27% 15% 6%	617
June	1st to 10th	Day	14% 12% 29% 29% 13% 3	661
	11th to 20th	Day	15% 10% 31% 28% 14% 3	780
	21st to end	Day	17% 7% 31% 31% 11% 3	780
July	1st to 10th	Day	11% 6% 24% 31% 21% 8%	722
	11th to 20th	Day	14% 6% 27% 31% 16% 7%	663
	21st to end	Day	10% 4 28% 35% 18% 7%	576
August	1st to 10th	Day	11% 5% 23% 29% 21% 12%	526
	11th to 20th	Day	16% 4 18% 29% 19% 15%	519
	21st to end	Day	16% 6% 19% 30% 20% 10%	583
September	1st to 10th	Day	12% 9% 23% 28% 18% 11%	530
	11th to 20th	Day	11% 5% 16% 28% 24% 16%	530
	21st to end	Day	17% 9% 27% 26% 14% 7%	530
October	1st to 10th	Day	20% 9% 26% 24% 16% 5%	530
	11th to 20th	Day	25% 15% 31% 22% 5% 2	530
	21st to end	Day	31% 16% 31% 17% 4 1	517
November	1st to 10th	Day	28% 18% 30% 15% 8%	330
	11th to 20th	Day	29% 20% 32% 14% 4 2	220
	21st to end	Day	30% 19% 35% 13% 3	220
December	1st to 10th	Day	30% 24% 27% 15% 4	220
	11th to 20th	Day	30% 25% 30% 13% 1	220
	21st to end	Day	33% 19% 35% 10% 2	242
January	1st to 10th	Night	23% 18% 35% 18% 6% 1	1050
	11th to 20th	Night	26% 17% 34% 18% 4	936
	21st to end	Night	20% 13% 36% 24% 6%	924
February	1st to 10th	Night	23% 16% 35% 23% 3	840
	11th to 20th	Night	22% 17% 35% 22% 4	823
	21st to end	Night	22% 18% 37% 20% 4	692
March	1st to 10th	Night	18% 17% 36% 20% 8%	840
	11th to 20th	Night	21% 14% 36% 22% 6% 1	840
	21st to end	Night	24% 12% 29% 26% 9%	924
April	1st to 10th	Night	26% 13% 32% 24% 5%	840
	11th to 20th	Night	23% 11% 30% 25% 10% 1	635
	21st to end	Night	22% 10% 27% 32% 9%	630
May	1st to 10th	Night	19% 6% 32% 29% 13% 1	630
	11th to 20th	Night	19% 7% 26% 34% 12% 1	567
	21st to end	Night	14% 3 28% 39% 15%	455
June	1st to 10th	Night	15% 4 29% 38% 12% 1	420
	11th to 20th	Night	13% 5% 28% 40% 14%	420
	21st to end	Night	13% 5% 25% 41% 14% 1	420
July	1st to 10th	Night	6% 3 18% 53% 19% 1	390
	11th to 20th	Night	11% 3 20% 41% 22% 3	506
	21st to end	Night	11% 2 18% 45% 23% 1	657
August	1st to 10th	Night	11% 2 15% 40% 30% 2	597
	11th to 20th	Night	11% 2 17% 35% 30% 5%	594
	21st to end	Night	13% 3 18% 36% 26% 3	660
September	1st to 10th	Night	11% 5% 24% 34% 21% 5%	799
	11th to 20th	Night	13% 3 17% 36% 27% 4	800
	21st to end	Night	17% 7% 22% 33% 17% 4	800
October	1st to 10th	Night	20% 8% 25% 31% 15% 1	800
	11th to 20th	Night	26% 11% 26% 29% 8% 1	800
	21st to end	Night	31% 11% 31% 24% 4	880
November	1st to 10th	Night	25% 12% 28% 26% 8% 1	820
	11th to 20th	Night	25% 16% 31% 20% 6% 1	840
	21st to end	Night	29% 14% 30% 22% 4	840
December	1st to 10th	Night	30% 15% 32% 19% 5%	840
	11th to 20th	Night	24% 18% 38% 17% 3 1	840
	21st to end	Night	32% 13% 34% 18% 3	1150

Page generated at 2026-06-28 02:10:48. Version ac07

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