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 2024-02-05.

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	15% 12% 5% 9% 7% 3 4 4 5% 6% 29%	78184
	Night	15% 13% 6% 10% 7% 4 5% 4 5% 5% 26%	80664
Transparency	Day	55% 6% 11% 18% 9% 1	77893
	Night	60% 6% 10% 15% 9% 1	80490
Seeing	Day	20% 11% 28% 24% 12% 5%	14035
	Night	21% 10% 29% 28% 11% 1	23470

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	15% 22% 12% 16% 8% 3 4 3 3 5% 9%	2315
	11th to 20th	Day	10% 21% 10% 21% 18% 6% 3 2 1 2 5%	2688
	21st to end	Day	18% 20% 11% 16% 9% 4 4 4 3 3 8%	3124
February	1st to 10th	Day	14% 19% 8% 16% 11% 5% 4 3 3 4 12%	1656
	11th to 20th	Day	13% 13% 10% 16% 14% 4 5% 5% 4 3 13%	1573
	21st to end	Day	16% 19% 8% 10% 9% 4 5% 4 3 4 20%	1465
March	1st to 10th	Day	13% 14% 6% 13% 9% 4 5% 3 4 5% 25%	1913
	11th to 20th	Day	11% 15% 7% 9% 7% 3 4 4 5% 5% 29%	1980
	21st to end	Day	17% 13% 5% 7% 7% 3 5% 4 5% 5% 29%	2178
April	1st to 10th	Day	17% 15% 6% 8% 5% 3 4 4 5% 5% 28%	2056
	11th to 20th	Day	18% 12% 3 5% 4 3 4 4 4 7% 35%	2312
	21st to end	Day	20% 11% 4 6% 5% 3 4 4 5% 7% 32%	2340
May	1st to 10th	Day	17% 9% 4 6% 6% 3 4 4 6% 6% 35%	2340
	11th to 20th	Day	17% 9% 2 6% 5% 3 4 4 4 6% 40%	2344
	21st to end	Day	13% 6% 3 5% 5% 3 4 5% 5% 9% 42%	2725
June	1st to 10th	Day	14% 6% 3 6% 5% 4 5% 5% 6% 7% 39%	2597
	11th to 20th	Day	12% 6% 2 5% 5% 3 5% 4 6% 9% 42%	2700
	21st to end	Day	16% 5% 3 5% 5% 3 4 4 5% 8% 42%	2700
July	1st to 10th	Day	9% 4 2 4 5% 2 5% 5% 6% 9% 49%	2700
	11th to 20th	Day	11% 6% 2 5% 5% 3 6% 6% 6% 9% 41%	2539
	21st to end	Day	10% 5% 3 4 5% 3 5% 5% 7% 10% 42%	2547
August	1st to 10th	Day	10% 6% 2 6% 5% 4 5% 7% 7% 9% 39%	2327
	11th to 20th	Day	11% 6% 2 6% 6% 4 5% 7% 7% 9% 36%	2303
	21st to end	Day	13% 6% 2 6% 5% 3 4 5% 6% 9% 41%	2556
September	1st to 10th	Day	12% 7% 3 6% 7% 4 4 5% 5% 9% 38%	2117
	11th to 20th	Day	13% 5% 3 6% 5% 3 5% 4 6% 8% 42%	1980
	21st to end	Day	17% 8% 3 5% 6% 3 4 5% 6% 8% 34%	1980
October	1st to 10th	Day	20% 8% 3 7% 6% 4 5% 4 4 7% 33%	1836
	11th to 20th	Day	23% 15% 4 8% 6% 5% 5% 4 5% 6% 20%	1800
	21st to end	Day	27% 16% 4 7% 6% 4 4 4 5% 5% 17%	1922
November	1st to 10th	Day	16% 17% 5% 8% 5% 3 5% 4 4 7% 26%	1672
	11th to 20th	Day	15% 19% 5% 10% 7% 4 5% 5% 6% 7% 18%	1522
	21st to end	Day	18% 23% 10% 10% 6% 3 4 4 5% 5% 12%	1520
December	1st to 10th	Day	15% 25% 13% 14% 8% 3 5% 4 3 4 7%	1520
	11th to 20th	Day	18% 21% 10% 15% 7% 3 4 4 4 4 9%	1906
	21st to end	Day	25% 23% 11% 11% 7% 3 3 3 4 3 8%	2431
January	1st to 10th	Night	15% 21% 11% 19% 9% 4 4 4 3 4 7%	4638
	11th to 20th	Night	13% 16% 10% 18% 17% 7% 5% 3 3 3 6%	4273
	21st to end	Night	18% 18% 11% 17% 10% 4 4 3 4 3 9%	4532
February	1st to 10th	Night	14% 19% 7% 13% 12% 5% 6% 4 3 4 13%	2399
	11th to 20th	Night	13% 14% 8% 15% 10% 5% 5% 5% 5% 6% 14%	2273
	21st to end	Night	15% 14% 7% 14% 8% 3 4 4 5% 5% 20%	1790
March	1st to 10th	Night	12% 12% 6% 12% 7% 4 5% 4 5% 5% 28%	2033
	11th to 20th	Night	12% 14% 6% 9% 7% 4 5% 4 4 6% 30%	1979
	21st to end	Night	17% 12% 4 8% 7% 3 5% 4 4 5% 31%	2178
April	1st to 10th	Night	19% 14% 4 6% 5% 3 4 4 5% 6% 30%	1908
	11th to 20th	Night	17% 10% 3 5% 4 4 4 4 5% 8% 36%	1608
	21st to end	Night	16% 11% 3 8% 6% 3 4 5% 5% 7% 31%	1620
May	1st to 10th	Night	15% 9% 3 6% 5% 3 5% 5% 5% 7% 37%	1620
	11th to 20th	Night	16% 6% 3 4 5% 4 5% 5% 5% 7% 41%	1547
	21st to end	Night	10% 4 2 5% 5% 3 5% 5% 6% 8% 48%	1550
June	1st to 10th	Night	13% 6% 2 6% 6% 2 5% 4 6% 8% 42%	1358
	11th to 20th	Night	12% 5% 3 5% 5% 3 4 5% 6% 10% 42%	1260
	21st to end	Night	12% 5% 2 5% 5% 3 4 5% 5% 8% 45%	1260
July	1st to 10th	Night	7% 4 2 4 4 2 5% 4 5% 8% 55%	1260
	11th to 20th	Night	8% 5% 2 4 4 3 4 5% 6% 8% 49%	1412
	21st to end	Night	8% 5% 3 6% 5% 3 5% 5% 6% 7% 48%	1771
August	1st to 10th	Night	10% 5% 2 4 5% 4 5% 5% 7% 8% 46%	1611
	11th to 20th	Night	8% 6% 2 4 3 3 5% 5% 7% 9% 47%	1598
	21st to end	Night	11% 5% 2 6% 6% 4 5% 4 6% 8% 45%	1782
September	1st to 10th	Night	11% 5% 3 6% 5% 3 4 5% 6% 8% 44%	1839
	11th to 20th	Night	12% 5% 2 4 4 2 5% 5% 5% 7% 49%	1980
	21st to end	Night	15% 7% 3 7% 5% 3 5% 4 5% 7% 39%	1980
October	1st to 10th	Night	19% 9% 3 6% 5% 3 4 4 5% 6% 36%	2124
	11th to 20th	Night	22% 12% 4 8% 6% 3 5% 4 5% 6% 24%	2160
	21st to end	Night	25% 14% 4 8% 7% 4 4 4 5% 4 21%	2434
November	1st to 10th	Night	17% 12% 4 8% 6% 4 5% 4 5% 6% 29%	2406
	11th to 20th	Night	16% 18% 6% 9% 6% 4 5% 5% 5% 5% 20%	2655
	21st to end	Night	20% 19% 8% 10% 6% 3 5% 4 4 5% 16%	2660
December	1st to 10th	Night	19% 24% 10% 13% 7% 3 5% 4 3 3 9%	2660
	11th to 20th	Night	13% 21% 10% 15% 7% 4 5% 4 5% 5% 12%	3288
	21st to end	Night	24% 21% 10% 13% 7% 3 4 4 3 3 7%	5218

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	77% 5% 7% 7% 3	2316
	11th to 20th	Day	89% 3 3 3 2	2688
	21st to end	Day	81% 6% 6% 5% 2	3124
February	1st to 10th	Day	77% 4 6% 10% 2	1656
	11th to 20th	Day	73% 6% 6% 10% 4 1	1582
	21st to end	Day	70% 5% 7% 12% 6%	1465
March	1st to 10th	Day	62% 4 12% 14% 8% 1	1916
	11th to 20th	Day	58% 6% 8% 17% 9% 2	1980
	21st to end	Day	57% 4 10% 17% 11% 2	2178
April	1st to 10th	Day	58% 5% 10% 16% 10%	2056
	11th to 20th	Day	50% 5% 11% 20% 14% 1	2312
	21st to end	Day	52% 4 12% 18% 11% 2	2340
May	1st to 10th	Day	50% 4 9% 23% 13% 1	2340
	11th to 20th	Day	46% 5% 11% 24% 14% 2	2348
	21st to end	Day	39% 6% 14% 23% 15% 3	2725
June	1st to 10th	Day	42% 7% 12% 23% 14% 2	2597
	11th to 20th	Day	38% 7% 12% 26% 16% 1	2700
	21st to end	Day	41% 6% 12% 25% 14% 1	2700
July	1st to 10th	Day	32% 7% 13% 24% 21% 2	2626
	11th to 20th	Day	37% 8% 14% 28% 13% 1	2460
	21st to end	Day	36% 8% 13% 26% 15% 2	2405
August	1st to 10th	Day	38% 9% 15% 26% 10% 2	2314
	11th to 20th	Day	42% 9% 15% 23% 11%	2303
	21st to end	Day	40% 6% 14% 25% 13% 1	2556
September	1st to 10th	Day	42% 7% 14% 23% 11% 2	2117
	11th to 20th	Day	39% 6% 14% 29% 12%	1980
	21st to end	Day	47% 6% 14% 24% 8% 1	1980
October	1st to 10th	Day	51% 6% 10% 19% 12% 2	1836
	11th to 20th	Day	64% 5% 11% 14% 5% 1	1800
	21st to end	Day	70% 5% 10% 10% 5%	1922
November	1st to 10th	Day	59% 6% 10% 17% 7%	1672
	11th to 20th	Day	64% 7% 11% 11% 6% 1	1522
	21st to end	Day	74% 6% 8% 10% 2	1520
December	1st to 10th	Day	82% 5% 5% 6% 1	1520
	11th to 20th	Day	78% 5% 8% 7% 1	1906
	21st to end	Day	82% 4 9% 4 1	2431
January	1st to 10th	Night	82% 4 7% 5% 2	4638
	11th to 20th	Night	85% 4 5% 3 2	4273
	21st to end	Night	81% 5% 7% 4 3	4532
February	1st to 10th	Night	76% 5% 7% 10% 2	2399
	11th to 20th	Night	70% 6% 9% 11% 4	2275
	21st to end	Night	65% 6% 9% 13% 7%	1790
March	1st to 10th	Night	58% 6% 10% 17% 9% 1	2043
	11th to 20th	Night	56% 6% 9% 18% 10% 2	1980
	21st to end	Night	55% 4 8% 19% 12% 2	2178
April	1st to 10th	Night	55% 5% 8% 18% 13% 1	1908
	11th to 20th	Night	49% 4 9% 19% 17% 1	1608
	21st to end	Night	51% 6% 9% 16% 15% 2	1620
May	1st to 10th	Night	45% 6% 9% 22% 16% 2	1620
	11th to 20th	Night	43% 5% 8% 23% 17% 3	1548
	21st to end	Night	33% 7% 14% 26% 16% 4	1551
June	1st to 10th	Night	39% 6% 10% 25% 16% 2	1358
	11th to 20th	Night	38% 6% 12% 24% 17% 3	1260
	21st to end	Night	36% 7% 12% 26% 18% 1	1260
July	1st to 10th	Night	27% 5% 12% 27% 25% 4	1225
	11th to 20th	Night	32% 6% 12% 30% 18% 1	1368
	21st to end	Night	36% 6% 15% 25% 16% 2	1672
August	1st to 10th	Night	35% 7% 14% 29% 15% 1	1600
	11th to 20th	Night	32% 8% 15% 29% 16% 1	1598
	21st to end	Night	38% 7% 11% 29% 14% 2	1782
September	1st to 10th	Night	37% 6% 12% 27% 15% 2	1839
	11th to 20th	Night	33% 7% 12% 31% 16% 1	1980
	21st to end	Night	44% 6% 13% 25% 11%	1980
October	1st to 10th	Night	49% 6% 9% 21% 14% 1	2124
	11th to 20th	Night	59% 5% 11% 18% 6%	2160
	21st to end	Night	66% 5% 10% 11% 7%	2434
November	1st to 10th	Night	55% 6% 10% 20% 8%	2406
	11th to 20th	Night	65% 6% 11% 13% 4 1	2655
	21st to end	Night	72% 5% 11% 10% 2	2660
December	1st to 10th	Night	80% 6% 7% 5% 2	2660
	11th to 20th	Night	75% 5% 11% 7% 2	3288
	21st to end	Night	83% 5% 7% 5% 1	5218

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	23% 18% 34% 19% 5% 1	213
	11th to 20th	Day	21% 17% 44% 12% 4 1	270
	21st to end	Day	24% 18% 34% 20% 3 1	297
February	1st to 10th	Day	26% 19% 39% 12% 4	252
	11th to 20th	Day	23% 22% 45% 9% 2	240
	21st to end	Day	31% 26% 29% 12% 1	198
March	1st to 10th	Day	24% 17% 38% 12% 7% 1	356
	11th to 20th	Day	23% 13% 35% 21% 7% 1	420
	21st to end	Day	29% 11% 32% 21% 6% 1	462
April	1st to 10th	Day	22% 17% 32% 20% 8% 1	420
	11th to 20th	Day	27% 16% 27% 15% 10% 5%	412
	21st to end	Day	25% 10% 32% 22% 8% 3	420
May	1st to 10th	Day	21% 11% 29% 25% 10% 4	423
	11th to 20th	Day	21% 9% 25% 25% 15% 4	447
	21st to end	Day	17% 6% 23% 29% 18% 7%	485
June	1st to 10th	Day	14% 10% 28% 31% 13% 4	527
	11th to 20th	Day	14% 10% 27% 30% 16% 3	630
	21st to end	Day	16% 6% 30% 33% 12% 3	630
July	1st to 10th	Day	10% 5% 22% 32% 23% 9%	621
	11th to 20th	Day	14% 7% 26% 30% 16% 7%	569
	21st to end	Day	10% 3 27% 36% 16% 7%	488
August	1st to 10th	Day	12% 5% 22% 29% 20% 13%	446
	11th to 20th	Day	15% 4 16% 30% 19% 16%	439
	21st to end	Day	17% 6% 19% 28% 20% 10%	495
September	1st to 10th	Day	13% 8% 22% 29% 18% 10%	450
	11th to 20th	Day	12% 6% 19% 28% 23% 13%	450
	21st to end	Day	16% 10% 28% 24% 14% 8%	450
October	1st to 10th	Day	22% 8% 26% 22% 16% 5%	450
	11th to 20th	Day	28% 16% 28% 22% 5% 1	450
	21st to end	Day	33% 17% 30% 16% 4 1	437
November	1st to 10th	Day	26% 19% 30% 16% 9%	270
	11th to 20th	Day	28% 19% 32% 15% 3 3	180
	21st to end	Day	27% 19% 37% 14% 2	180
December	1st to 10th	Day	31% 25% 27% 14% 3	180
	11th to 20th	Day	28% 27% 30% 13% 2 1	180
	21st to end	Day	31% 20% 38% 10% 2	198
January	1st to 10th	Night	24% 17% 34% 18% 6% 1	950
	11th to 20th	Night	27% 16% 33% 19% 4	848
	21st to end	Night	21% 11% 36% 25% 7%	836
February	1st to 10th	Night	24% 16% 35% 23% 3	739
	11th to 20th	Night	23% 16% 34% 22% 5%	703
	21st to end	Night	23% 18% 36% 19% 4	592
March	1st to 10th	Night	19% 16% 35% 22% 9%	720
	11th to 20th	Night	20% 13% 37% 23% 6% 1	720
	21st to end	Night	24% 11% 28% 27% 10% 1	792
April	1st to 10th	Night	27% 12% 30% 25% 5%	720
	11th to 20th	Night	23% 10% 30% 25% 11% 1	544
	21st to end	Night	23% 8% 27% 31% 9%	540
May	1st to 10th	Night	20% 6% 31% 29% 14% 1	540
	11th to 20th	Night	19% 6% 26% 35% 13% 1	486
	21st to end	Night	11% 3 28% 40% 17% 1	389
June	1st to 10th	Night	15% 3 28% 40% 13% 1	360
	11th to 20th	Night	14% 5% 25% 41% 16%	360
	21st to end	Night	13% 5% 24% 41% 16% 1	360
July	1st to 10th	Night	6% 3 16% 53% 21% 1	350
	11th to 20th	Night	11% 3 20% 40% 23% 3	454
	21st to end	Night	10% 3 18% 46% 22% 1	591
August	1st to 10th	Night	12% 2 15% 39% 30% 2	537
	11th to 20th	Night	10% 2 17% 36% 30% 5%	534
	21st to end	Night	14% 3 19% 35% 25% 3	594
September	1st to 10th	Night	12% 5% 24% 35% 19% 5%	719
	11th to 20th	Night	14% 4 19% 36% 23% 4	720
	21st to end	Night	16% 8% 22% 32% 17% 4	720
October	1st to 10th	Night	22% 8% 25% 29% 15% 2	720
	11th to 20th	Night	27% 11% 25% 28% 7% 1	720
	21st to end	Night	32% 12% 30% 23% 3	792
November	1st to 10th	Night	25% 11% 28% 26% 9% 1	740
	11th to 20th	Night	25% 16% 32% 19% 7% 1	760
	21st to end	Night	28% 14% 30% 23% 4	760
December	1st to 10th	Night	31% 15% 31% 18% 4	760
	11th to 20th	Night	23% 18% 38% 17% 3 1	760
	21st to end	Night	32% 14% 34% 18% 2	1040

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