Goderich
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goderich clear sky chart from 2005-11-06 to 2024-11-05.

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% 4 8% 5% 4 4 3 5% 7% 32%	101444
	Night	16% 15% 5% 10% 5% 4 4 3 4 5% 29%	97635
Transparency	Day	50% 7% 13% 19% 10% 1	105008
	Night	55% 7% 11% 17% 9% 1	102160
Seeing	Day	19% 11% 26% 26% 14% 4	15195
	Night	22% 11% 27% 27% 11% 1	24483

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	17% 27% 12% 17% 5% 4 2 1 3 3 9%	2380
	11th to 20th	Day	12% 24% 11% 25% 14% 4 2 1 2 2 5%	2628
	21st to end	Day	20% 23% 11% 18% 6% 4 3 2 3 3 8%	3124
February	1st to 10th	Day	15% 20% 6% 16% 9% 5% 4 2 3 4 15%	1710
	11th to 20th	Day	14% 15% 10% 19% 9% 5% 4 2 3 4 16%	1672
	21st to end	Day	15% 19% 6% 11% 6% 5% 4 3 4 4 23%	1570
March	1st to 10th	Day	18% 14% 7% 9% 5% 4 3 2 3 5% 29%	3304
	11th to 20th	Day	13% 16% 7% 10% 4 4 3 3 5% 6% 28%	3480
	21st to end	Day	16% 12% 5% 9% 6% 4 4 3 5% 5% 30%	3815
April	1st to 10th	Day	17% 15% 5% 7% 4 5% 4 2 5% 6% 30%	2173
	11th to 20th	Day	19% 10% 3 6% 4 4 3 3 5% 7% 36%	2442
	21st to end	Day	19% 9% 4 6% 4 3 4 3 5% 6% 36%	2470
May	1st to 10th	Day	17% 9% 3 7% 5% 4 4 4 5% 7% 36%	4108
	11th to 20th	Day	17% 8% 2 7% 4 4 3 4 5% 8% 38%	4099
	21st to end	Day	15% 5% 2 5% 3 3 4 3 5% 7% 48%	4837
June	1st to 10th	Day	13% 6% 2 6% 5% 5% 5% 4 6% 9% 39%	2769
	11th to 20th	Day	11% 6% 2 5% 4 4 5% 4 6% 9% 43%	2850
	21st to end	Day	15% 7% 2 5% 4 4 3 4 6% 8% 43%	2850
July	1st to 10th	Day	12% 6% 2 6% 4 4 5% 4 7% 9% 41%	4760
	11th to 20th	Day	11% 5% 2 5% 3 4 4 3 6% 8% 49%	4427
	21st to end	Day	9% 5% 2 5% 4 4 5% 4 7% 9% 47%	4466
August	1st to 10th	Day	12% 6% 2 6% 4 5% 5% 4 7% 9% 40%	4104
	11th to 20th	Day	11% 6% 2 6% 4 5% 5% 5% 7% 10% 38%	4044
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 4 6% 8% 45%	4515
September	1st to 10th	Day	13% 6% 3 6% 5% 4 4 4 5% 8% 42%	2206
	11th to 20th	Day	12% 5% 2 6% 4 4 4 3 5% 8% 46%	2090
	21st to end	Day	18% 7% 3 6% 4 4 5% 4 6% 8% 35%	2090
October	1st to 10th	Day	19% 8% 3 6% 5% 4 4 4 5% 6% 36%	1954
	11th to 20th	Day	24% 14% 3 8% 5% 4 4 3 5% 7% 22%	1900
	21st to end	Day	29% 15% 4 8% 5% 5% 4 3 4 6% 18%	2009
November	1st to 10th	Day	19% 18% 3 7% 5% 4 4 4 4 6% 26%	1708
	11th to 20th	Day	19% 22% 5% 10% 5% 4 4 3 5% 5% 19%	1558
	21st to end	Day	21% 28% 7% 9% 5% 3 3 3 4 4 13%	1520
December	1st to 10th	Day	18% 32% 10% 13% 5% 3 3 2 2 3 7%	1520
	11th to 20th	Day	20% 23% 10% 15% 7% 4 3 2 3 3 9%	1861
	21st to end	Day	28% 24% 9% 11% 4 3 4 2 3 4 8%	2431
January	1st to 10th	Night	17% 26% 11% 20% 6% 3 2 2 2 2 8%	4574
	11th to 20th	Night	15% 23% 10% 20% 12% 4 3 2 2 2 6%	4334
	21st to end	Night	20% 22% 10% 17% 6% 4 3 2 3 3 9%	4532
February	1st to 10th	Night	16% 21% 6% 16% 10% 5% 4 3 3 3 14%	2470
	11th to 20th	Night	15% 17% 7% 17% 8% 5% 4 3 5% 5% 16%	2391
	21st to end	Night	15% 17% 6% 13% 6% 4 5% 4 5% 4 22%	1884
March	1st to 10th	Night	14% 14% 4 8% 5% 4 4 3 4 6% 35%	3536
	11th to 20th	Night	11% 15% 6% 8% 5% 4 4 3 5% 6% 33%	3479
	21st to end	Night	16% 10% 5% 9% 5% 4 4 4 5% 5% 34%	3817
April	1st to 10th	Night	21% 13% 3 7% 4 3 3 4 5% 5% 31%	2024
	11th to 20th	Night	19% 9% 3 6% 4 4 4 4 5% 7% 36%	1687
	21st to end	Night	18% 13% 4 7% 5% 3 3 4 5% 5% 33%	1710
May	1st to 10th	Night	16% 8% 3 6% 3 4 4 3 5% 8% 40%	2833
	11th to 20th	Night	14% 10% 2 8% 5% 4 4 3 5% 6% 39%	2790
	21st to end	Night	11% 4 2 5% 4 3 4 4 5% 7% 50%	2738
June	1st to 10th	Night	15% 6% 3 6% 5% 4 4 3 5% 7% 42%	1406
	11th to 20th	Night	11% 6% 2 8% 4 3 4 4 8% 10% 40%	1330
	21st to end	Night	13% 6% 2 6% 5% 4 3 3 5% 8% 45%	1330
July	1st to 10th	Night	7% 6% 3 7% 6% 3 5% 4 7% 7% 46%	2210
	11th to 20th	Night	11% 4 2 4 3 3 5% 4 4 7% 52%	2536
	21st to end	Night	7% 6% 2 6% 5% 4 5% 5% 7% 7% 47%	3087
August	1st to 10th	Night	12% 6% 2 6% 5% 4 5% 4 4 7% 45%	2825
	11th to 20th	Night	13% 7% 2 6% 3 4 4 4 6% 8% 43%	2785
	21st to end	Night	11% 6% 2 6% 4 4 4 3 6% 6% 47%	3124
September	1st to 10th	Night	12% 5% 3 6% 4 4 4 4 6% 7% 46%	1955
	11th to 20th	Night	13% 5% 2 5% 3 4 3 2 5% 7% 51%	2090
	21st to end	Night	18% 7% 2 7% 5% 4 4 3 5% 7% 38%	2090
October	1st to 10th	Night	19% 8% 3 7% 5% 3 3 2 5% 7% 38%	2224
	11th to 20th	Night	28% 11% 3 7% 5% 4 5% 3 4 5% 24%	2280
	21st to end	Night	28% 14% 3 8% 5% 4 4 3 4 5% 21%	2588
November	1st to 10th	Night	20% 17% 3 8% 4 4 4 3 4 5% 29%	2470
	11th to 20th	Night	19% 25% 5% 9% 5% 4 3 3 4 5% 18%	2621
	21st to end	Night	23% 26% 7% 9% 4 4 3 2 3 4 14%	2660
December	1st to 10th	Night	21% 33% 9% 11% 5% 3 2 2 2 3 9%	2660
	11th to 20th	Night	16% 25% 9% 16% 5% 4 3 3 4 4 12%	3329
	21st to end	Night	26% 26% 8% 12% 4 4 3 3 3 3 8%	5236

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	79% 9% 7% 4 1	2381
	11th to 20th	Day	90% 3 3 2 2	2628
	21st to end	Day	82% 7% 6% 4 1	3124
February	1st to 10th	Day	74% 6% 8% 10% 2	1710
	11th to 20th	Day	73% 6% 7% 11% 3 1	1681
	21st to end	Day	63% 7% 11% 13% 5% 1	1570
March	1st to 10th	Day	59% 5% 14% 17% 5%	3307
	11th to 20th	Day	53% 9% 13% 18% 6% 1	3480
	21st to end	Day	53% 9% 13% 14% 9% 1	3815
April	1st to 10th	Day	54% 6% 13% 17% 9%	2173
	11th to 20th	Day	46% 7% 12% 20% 13% 2	2442
	21st to end	Day	48% 7% 13% 18% 12% 2	2470
May	1st to 10th	Day	44% 8% 13% 18% 15% 2	4120
	11th to 20th	Day	42% 12% 15% 21% 8% 1	4103
	21st to end	Day	35% 7% 13% 20% 19% 6%	4837
June	1st to 10th	Day	41% 7% 13% 23% 14% 2	2769
	11th to 20th	Day	35% 7% 14% 25% 17% 1	2850
	21st to end	Day	39% 7% 14% 25% 14% 1	2850
July	1st to 10th	Day	38% 7% 17% 20% 16% 2	4686
	11th to 20th	Day	32% 6% 13% 35% 13% 1	4350
	21st to end	Day	32% 8% 16% 26% 17% 2	4324
August	1st to 10th	Day	39% 8% 14% 24% 14% 1	4091
	11th to 20th	Day	39% 8% 18% 26% 9% 1	4083
	21st to end	Day	35% 7% 15% 29% 13% 1	4515
September	1st to 10th	Day	39% 8% 17% 24% 11% 2	2206
	11th to 20th	Day	35% 7% 16% 28% 13% 1	2090
	21st to end	Day	45% 9% 14% 23% 9%	2090
October	1st to 10th	Day	43% 6% 12% 25% 12% 1	3240
	11th to 20th	Day	48% 7% 12% 24% 10%	3140
	21st to end	Day	58% 7% 14% 16% 4	3285
November	1st to 10th	Day	58% 8% 9% 16% 7% 1	1708
	11th to 20th	Day	66% 8% 11% 9% 5% 1	1558
	21st to end	Day	76% 7% 8% 8% 2	1520
December	1st to 10th	Day	84% 5% 5% 5% 1	1520
	11th to 20th	Day	80% 7% 8% 5% 1	1861
	21st to end	Day	82% 6% 9% 3	2431
January	1st to 10th	Night	82% 7% 6% 3 1	4574
	11th to 20th	Night	86% 5% 4 2 1	4334
	21st to end	Night	80% 7% 7% 4 2	4532
February	1st to 10th	Night	75% 6% 7% 10% 2	2470
	11th to 20th	Night	70% 7% 10% 10% 3	2393
	21st to end	Night	63% 7% 11% 13% 6%	1884
March	1st to 10th	Night	50% 7% 16% 22% 6%	3546
	11th to 20th	Night	48% 8% 15% 19% 8% 1	3480
	21st to end	Night	49% 8% 13% 19% 9% 1	3817
April	1st to 10th	Night	54% 6% 9% 19% 12% 1	2024
	11th to 20th	Night	47% 7% 9% 18% 16% 2	1687
	21st to end	Night	50% 6% 9% 16% 15% 3	1710
May	1st to 10th	Night	42% 8% 12% 19% 16% 4	2840
	11th to 20th	Night	43% 9% 13% 20% 12% 2	2791
	21st to end	Night	31% 10% 12% 23% 21% 4	2739
June	1st to 10th	Night	41% 6% 11% 24% 16% 2	1406
	11th to 20th	Night	38% 6% 12% 25% 17% 3	1330
	21st to end	Night	38% 6% 12% 25% 18% 2	1330
July	1st to 10th	Night	34% 7% 12% 24% 17% 6%	2175
	11th to 20th	Night	31% 6% 12% 32% 18% 1	2490
	21st to end	Night	33% 9% 14% 24% 19% 2	2988
August	1st to 10th	Night	39% 7% 11% 27% 15% 1	2814
	11th to 20th	Night	38% 7% 14% 25% 15% 1	2812
	21st to end	Night	36% 7% 11% 32% 13% 1	3124
September	1st to 10th	Night	36% 8% 12% 26% 15% 2	1955
	11th to 20th	Night	32% 6% 15% 26% 19% 1	2090
	21st to end	Night	44% 8% 13% 22% 12% 1	2090
October	1st to 10th	Night	38% 7% 9% 26% 20% 1	3718
	11th to 20th	Night	50% 7% 14% 20% 10%	3779
	21st to end	Night	53% 6% 14% 20% 7%	4262
November	1st to 10th	Night	58% 7% 11% 17% 8%	2470
	11th to 20th	Night	68% 6% 10% 11% 4 1	2621
	21st to end	Night	74% 6% 10% 8% 2	2660
December	1st to 10th	Night	82% 5% 6% 5% 1	2660
	11th to 20th	Night	76% 8% 9% 5% 1	3329
	21st to end	Night	83% 6% 8% 3	5236

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	25% 19% 32% 17% 6% 1	231
	11th to 20th	Day	23% 19% 39% 14% 4 1	270
	21st to end	Day	24% 14% 36% 21% 4	297
February	1st to 10th	Day	24% 22% 38% 13% 3	270
	11th to 20th	Day	17% 20% 48% 13% 2	270
	21st to end	Day	24% 28% 33% 13% 2	225
March	1st to 10th	Day	24% 14% 37% 19% 6% 1	379
	11th to 20th	Day	21% 14% 29% 28% 8% 1	460
	21st to end	Day	25% 13% 31% 23% 7% 1	506
April	1st to 10th	Day	22% 15% 32% 21% 8% 1	460
	11th to 20th	Day	26% 13% 25% 22% 9% 5%	452
	21st to end	Day	24% 9% 31% 25% 10% 2	460
May	1st to 10th	Day	19% 11% 26% 28% 13% 3	463
	11th to 20th	Day	19% 7% 23% 26% 19% 6%	487
	21st to end	Day	16% 5% 22% 30% 21% 6%	529
June	1st to 10th	Day	13% 5% 28% 32% 18% 3	599
	11th to 20th	Day	12% 5% 29% 33% 17% 4	680
	21st to end	Day	16% 5% 23% 37% 15% 4	680
July	1st to 10th	Day	9% 5% 18% 34% 25% 9%	671
	11th to 20th	Day	13% 4 24% 30% 22% 7%	644
	21st to end	Day	10% 3 20% 37% 23% 8%	532
August	1st to 10th	Day	10% 3 20% 31% 24% 11%	486
	11th to 20th	Day	13% 4 16% 32% 23% 12%	479
	21st to end	Day	15% 4 18% 31% 24% 7%	539
September	1st to 10th	Day	12% 8% 21% 28% 23% 8%	490
	11th to 20th	Day	9% 5% 17% 26% 28% 14%	490
	21st to end	Day	19% 10% 23% 24% 18% 7%	490
October	1st to 10th	Day	21% 10% 25% 23% 16% 5%	490
	11th to 20th	Day	28% 15% 28% 21% 7% 1	490
	21st to end	Day	31% 18% 29% 17% 5% 1	458
November	1st to 10th	Day	23% 19% 30% 17% 9% 1	282
	11th to 20th	Day	28% 22% 29% 16% 4 1	198
	21st to end	Day	28% 22% 33% 15% 2	180
December	1st to 10th	Day	28% 28% 27% 15% 2 1	180
	11th to 20th	Day	28% 26% 29% 13% 3 1	180
	21st to end	Day	34% 18% 35% 11% 2	198
January	1st to 10th	Night	24% 19% 33% 18% 5% 1	950
	11th to 20th	Night	27% 18% 31% 19% 5%	883
	21st to end	Night	21% 13% 35% 25% 5%	836
February	1st to 10th	Night	27% 15% 32% 23% 3	760
	11th to 20th	Night	23% 16% 33% 23% 5% 1	743
	21st to end	Night	24% 15% 37% 21% 4	628
March	1st to 10th	Night	20% 13% 35% 24% 8%	760
	11th to 20th	Night	20% 15% 34% 24% 7% 1	760
	21st to end	Night	23% 9% 29% 29% 9% 1	836
April	1st to 10th	Night	25% 13% 28% 28% 5%	751
	11th to 20th	Night	23% 9% 29% 27% 11% 1	563
	21st to end	Night	23% 10% 26% 30% 11% 1	570
May	1st to 10th	Night	20% 5% 26% 34% 14% 1	570
	11th to 20th	Night	19% 5% 23% 36% 15% 1	552
	21st to end	Night	12% 3 25% 39% 20% 1	411
June	1st to 10th	Night	17% 4 22% 40% 16% 1	380
	11th to 20th	Night	13% 4 25% 41% 17% 1	380
	21st to end	Night	13% 5% 20% 41% 20% 1	380
July	1st to 10th	Night	7% 4 15% 50% 22% 3	370
	11th to 20th	Night	11% 2 16% 42% 24% 5%	525
	21st to end	Night	10% 3 14% 48% 24% 2	624
August	1st to 10th	Night	11% 3 15% 38% 30% 4	567
	11th to 20th	Night	11% 3 16% 36% 29% 5%	564
	21st to end	Night	14% 3 18% 34% 28% 4	627
September	1st to 10th	Night	13% 4 21% 36% 19% 7%	744
	11th to 20th	Night	13% 4 18% 33% 28% 4	760
	21st to end	Night	19% 8% 21% 31% 16% 5%	760
October	1st to 10th	Night	22% 8% 26% 26% 15% 2	760
	11th to 20th	Night	29% 14% 24% 24% 8% 1	760
	21st to end	Night	34% 13% 27% 23% 3	836
November	1st to 10th	Night	28% 13% 24% 26% 8% 1	760
	11th to 20th	Night	29% 18% 31% 16% 5% 1	760
	21st to end	Night	33% 17% 27% 18% 4	760
December	1st to 10th	Night	34% 22% 26% 15% 3	760
	11th to 20th	Night	24% 23% 34% 15% 3 1	788
	21st to end	Night	34% 15% 33% 16% 2	1045

Page generated at 2024-11-03 02:11:24. Version ac07

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